diff --git a/config/.ruff.toml b/config/.ruff.toml
index e67679e02..dbfc69145 100644
--- a/config/.ruff.toml
+++ b/config/.ruff.toml
@@ -1,3 +1,5 @@
 extend = "../pyproject.toml"
+# Use this line when config moves inside python tree.
+# extend = "../../../../../../pyproject.toml"
 # Ignore undefined "config", as config files are loaded with `eval`.
 builtins = ["config"]
diff --git a/config/bias.py b/config/bias.py
index 6cde08506..107429716 100644
--- a/config/bias.py
+++ b/config/bias.py
@@ -20,7 +20,5 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "lsstCamCommon.py"))
-config.isr.load(os.path.join(os.path.dirname(__file__), "isr.py"))
+config.load("lsstCamCommon.py")
+config.isr.load("isr.py")
diff --git a/config/calibrate.py b/config/calibrate.py
index 7a6d4fb71..b1023aabe 100644
--- a/config/calibrate.py
+++ b/config/calibrate.py
@@ -23,18 +23,15 @@
 """
 LSST Cam-specific overrides for CalibrateTask
 """
-import os.path
-
-obsConfigDir = os.path.dirname(__file__)
 
 # TODO: Turn color terms back on when they are available
 config.photoCal.applyColorTerms = False
 config.photoCal.photoCatName = "the_monster_20250219"
 
 # Activate calibration of measurements: required for aperture corrections
-config.measurement.load(os.path.join(obsConfigDir, "apertures.py"))
-config.measurement.load(os.path.join(obsConfigDir, "kron.py"))
-config.measurement.load(os.path.join(obsConfigDir, "hsm.py"))
+config.measurement.load("apertures.py")
+config.measurement.load("kron.py")
+config.measurement.load("hsm.py")
 
 config.measurement.plugins.names |= ["base_Jacobian", "base_FPPosition"]
 
diff --git a/config/characterizeImage.py b/config/characterizeImage.py
index 36d16e317..236dadb51 100644
--- a/config/characterizeImage.py
+++ b/config/characterizeImage.py
@@ -23,15 +23,12 @@
 """
 LSST Cam-specific overrides for CharacterizeImageTask
 """
-import os.path
-
-obsConfigDir = os.path.join(os.path.dirname(__file__))
 
 # PSF determination
 config.measurePsf.reserve.fraction = 0.2
 
 # Activate calibration of measurements: required for aperture corrections
-config.measurement.load(os.path.join(obsConfigDir, "apertures.py"))
+config.measurement.load("apertures.py")
 
 config.measurement.plugins.names |= ["base_Jacobian", "base_FPPosition"]
 config.measurement.plugins["base_Jacobian"].pixelScale = 0.2
diff --git a/config/comCam/analysisToolsPhotometricCatalogMatch.py b/config/comCam/analysisToolsPhotometricCatalogMatch.py
index d5f3b3d58..930b37076 100644
--- a/config/comCam/analysisToolsPhotometricCatalogMatch.py
+++ b/config/comCam/analysisToolsPhotometricCatalogMatch.py
@@ -1,5 +1,2 @@
-import os.path
-
-configDir = os.path.dirname(__file__)
-config.referenceCatalogLoader.refObjLoader.load(os.path.join(configDir, "filterMap.py"))
+config.referenceCatalogLoader.refObjLoader.load("filterMap.py")
 config.referenceCatalogLoader.doApplyColorTerms = False
diff --git a/config/comCam/analysisToolsPhotometricCatalogMatchVisit.py b/config/comCam/analysisToolsPhotometricCatalogMatchVisit.py
index d5f3b3d58..930b37076 100644
--- a/config/comCam/analysisToolsPhotometricCatalogMatchVisit.py
+++ b/config/comCam/analysisToolsPhotometricCatalogMatchVisit.py
@@ -1,5 +1,2 @@
-import os.path
-
-configDir = os.path.dirname(__file__)
-config.referenceCatalogLoader.refObjLoader.load(os.path.join(configDir, "filterMap.py"))
+config.referenceCatalogLoader.refObjLoader.load("filterMap.py")
 config.referenceCatalogLoader.doApplyColorTerms = False
diff --git a/config/comCam/calibrate.py b/config/comCam/calibrate.py
index 33cb3e1bf..89ca6c237 100644
--- a/config/comCam/calibrate.py
+++ b/config/comCam/calibrate.py
@@ -1,7 +1,4 @@
-import os
-
-obsConfigDir = os.path.join(os.path.dirname(__file__))
-config.photoRefObjLoader.load(os.path.join(obsConfigDir, "filterMap.py"))
+config.photoRefObjLoader.load("filterMap.py")
 config.connections.astromRefCat = "the_monster_20250219"
 
 # Loosen maxOffset to account for early pointing model inaccuracy.
@@ -17,10 +14,10 @@
 
 # Overrides to improved astrometry matching.
 config.astrometry.doFiducialZeroPointCull = True
-config.astrometry.load(os.path.join(obsConfigDir, "fiducialZeroPoint.py"))
+config.astrometry.load("fiducialZeroPoint.py")
 
 # Loosened for early ComCam with large PSFs.
 config.photoCal.match.sourceSelection.doUnresolved = False
 
 # Exposure summary stats.
-config.computeSummaryStats.load(os.path.join(obsConfigDir, "computeExposureSummaryStats.py"))
+config.computeSummaryStats.load("computeExposureSummaryStats.py")
diff --git a/config/comCam/calibrateImage.py b/config/comCam/calibrateImage.py
index 3d55d0bfc..54f6454da 100644
--- a/config/comCam/calibrateImage.py
+++ b/config/comCam/calibrateImage.py
@@ -1,10 +1,6 @@
-import os
-
 from lsst.meas.algorithms import ColorLimit  # Configure the photometry to use the_monster.
 
 # Configure the photometry to use atlas_refcat2.
-config_dir = os.path.dirname(__file__)
-
 config.connections.photometry_ref_cat = "the_monster_20250219"
 config.connections.astrometry_ref_cat = "the_monster_20250219"
 
@@ -15,8 +11,8 @@
 config.star_background.doApplyFlatBackgroundRatio = True
 config.star_detection.doApplyFlatBackgroundRatio = True
 
-config.astrometry.load(os.path.join(config_dir, "filterMap.py"))
-config.photometry_ref_loader.load(os.path.join(config_dir, "filterMap.py"))
+config.astrometry.load("filterMap.py")
+config.photometry_ref_loader.load("filterMap.py")
 
 config.photometry.match.referenceSelection.magLimit.fluxField = "monster_ComCam_r_flux"
 colors = config.photometry.match.referenceSelection.colorLimits
@@ -30,7 +26,7 @@
 config.photometry.applyColorTerms = False
 config.photometry.photoCatName = "the_monster_20250219"
 
-config.compute_summary_stats.load(os.path.join(config_dir, "computeExposureSummaryStats.py"))
+config.compute_summary_stats.load("computeExposureSummaryStats.py")
 
 # Loosen maxOffset to account for early pointing model inaccuracy.
 config.astrometry.matcher.maxOffsetPix=1500
@@ -45,7 +41,7 @@
 
 # Overrides to improved astrometry matching.
 config.astrometry.doFiducialZeroPointCull = True
-config.astrometry.load(os.path.join(config_dir, "fiducialZeroPoint.py"))
+config.astrometry.load("fiducialZeroPoint.py")
 
 # Loosened for early ComCam with large PSFs.
 config.photometry.match.sourceSelection.doUnresolved = False
diff --git a/config/comCam/computeExposureSummaryStats.py b/config/comCam/computeExposureSummaryStats.py
index 06f799fe4..80a397f84 100644
--- a/config/comCam/computeExposureSummaryStats.py
+++ b/config/comCam/computeExposureSummaryStats.py
@@ -1,7 +1,4 @@
-import os.path
 
-config_dir = os.path.dirname(__file__)
-
-config.load(os.path.join(config_dir, "fiducialPsfSigma.py"))
-config.load(os.path.join(config_dir, "fiducialSkyBackground.py"))
-config.load(os.path.join(config_dir, "fiducialZeroPoint.py"))
+config.load("fiducialPsfSigma.py")
+config.load("fiducialSkyBackground.py")
+config.load("fiducialZeroPoint.py")
diff --git a/config/comCam/fgcmBuildFromIsolatedStars.py b/config/comCam/fgcmBuildFromIsolatedStars.py
index acd834f01..905ae3c8e 100644
--- a/config/comCam/fgcmBuildFromIsolatedStars.py
+++ b/config/comCam/fgcmBuildFromIsolatedStars.py
@@ -1,5 +1,3 @@
-import os
-
 physical_to_band = {
     "u_02": "u",
     "g_01": "g",
@@ -17,10 +15,8 @@
 config.minPerBand = 2
 config.connections.ref_cat = "the_monster_20250219"
 
-configDir = os.path.join(os.path.dirname(__file__))
 config.physicalFilterMap = physical_to_band
-obsConfigDir = os.path.join(os.path.dirname(__file__))
-config.fgcmLoadReferenceCatalog.load(os.path.join(obsConfigDir, "filterMap.py"))
+config.fgcmLoadReferenceCatalog.load("filterMap.py")
 config.fgcmLoadReferenceCatalog.applyColorTerms = False
 config.fgcmLoadReferenceCatalog.referenceSelector.doSignalToNoise = True
 config.fgcmLoadReferenceCatalog.referenceSelector.signalToNoise.fluxField = "monster_ComCam_i_flux"
diff --git a/config/comCam/finalize_characterization_detector.py b/config/comCam/finalize_characterization_detector.py
index 9943467d7..b853923a3 100644
--- a/config/comCam/finalize_characterization_detector.py
+++ b/config/comCam/finalize_characterization_detector.py
@@ -1,3 +1 @@
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "finalize_characterization.py"))
+config.load("finalize_characterization.py")
diff --git a/config/comCam/reprocessVisitImage.py b/config/comCam/reprocessVisitImage.py
index 59d7cad1e..4fe782da4 100644
--- a/config/comCam/reprocessVisitImage.py
+++ b/config/comCam/reprocessVisitImage.py
@@ -1,8 +1,5 @@
 #!/usr/bin/env python
-import os.path
 
-ObsConfigDir = os.path.dirname(__file__)
-
-config.compute_summary_stats.load(os.path.join(ObsConfigDir, "computeExposureSummaryStats.py"))
+config.compute_summary_stats.load("computeExposureSummaryStats.py")
 
 config.do_apply_flat_background_ratio = True
diff --git a/config/comCam/updateVisitSummary.py b/config/comCam/updateVisitSummary.py
index c5273542c..6ccc2a9c3 100644
--- a/config/comCam/updateVisitSummary.py
+++ b/config/comCam/updateVisitSummary.py
@@ -1,6 +1,3 @@
 #!/usr/bin/env python
-import os.path
 
-ObsConfigDir = os.path.dirname(__file__)
-
-config.compute_summary_stats.load(os.path.join(ObsConfigDir, "computeExposureSummaryStats.py"))
+config.compute_summary_stats.load("computeExposureSummaryStats.py")
diff --git a/config/comCamSim/analysisToolsPhotometricCatalogMatch.py b/config/comCamSim/analysisToolsPhotometricCatalogMatch.py
index 52ff0d9c1..20e57b7c4 100644
--- a/config/comCamSim/analysisToolsPhotometricCatalogMatch.py
+++ b/config/comCamSim/analysisToolsPhotometricCatalogMatch.py
@@ -1,7 +1,4 @@
-import os.path
-
-configDir = os.path.dirname(__file__)
-config.referenceCatalogLoader.refObjLoader.load(os.path.join(configDir, "filterMap.py"))
+config.referenceCatalogLoader.refObjLoader.load("filterMap.py")
 config.referenceCatalogLoader.doApplyColorTerms = False
 
 config.connections.refCatalog = "uw_stars_20240524"
diff --git a/config/comCamSim/analysisToolsPhotometricCatalogMatchVisit.py b/config/comCamSim/analysisToolsPhotometricCatalogMatchVisit.py
index 6f223cbf2..e08e45767 100644
--- a/config/comCamSim/analysisToolsPhotometricCatalogMatchVisit.py
+++ b/config/comCamSim/analysisToolsPhotometricCatalogMatchVisit.py
@@ -1,7 +1,4 @@
-import os.path
-
-configDir = os.path.dirname(__file__)
-config.referenceCatalogLoader.refObjLoader.load(os.path.join(configDir, "filterMap.py"))
+config.referenceCatalogLoader.refObjLoader.load("filterMap.py")
 config.referenceCatalogLoader.doApplyColorTerms = False
 
 config.connections.refCatalog = "uw_stars_20240524"
diff --git a/config/comCamSim/calibrate.py b/config/comCamSim/calibrate.py
index aa9b0bd20..86506bb97 100644
--- a/config/comCamSim/calibrate.py
+++ b/config/comCamSim/calibrate.py
@@ -20,16 +20,12 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-configDir = os.path.dirname(__file__)
-
 config.connections.astromRefCat = "uw_stars_20240524"
 config.connections.photoRefCat = "uw_stars_20240524"
 config.photoCal.photoCatName = "uw_stars_20240524"
 
-config.astromRefObjLoader.load(os.path.join(configDir, "filterMap.py"))
-config.photoRefObjLoader.load(os.path.join(configDir, "filterMap.py"))
+config.astromRefObjLoader.load("filterMap.py")
+config.photoRefObjLoader.load("filterMap.py")
 config.astromRefObjLoader.anyFilterMapsToThis = None
 config.photoRefObjLoader.anyFilterMapsToThis = None
 
@@ -52,4 +48,4 @@
 config.photoCal.match.referenceSelection.magLimit.maximum = 22.0
 
 # Exposure summary stats
-config.computeSummaryStats.load(os.path.join(configDir, "computeExposureSummaryStats.py"))
+config.computeSummaryStats.load("computeExposureSummaryStats.py")
diff --git a/config/comCamSim/calibrateImage.py b/config/comCamSim/calibrateImage.py
index 8e6b03a9d..35f207e0b 100644
--- a/config/comCamSim/calibrateImage.py
+++ b/config/comCamSim/calibrateImage.py
@@ -1,13 +1,10 @@
 # ComCamSim-specialized configuration for CalibrateImageTask.
-import os.path
-
-configDir = os.path.dirname(__file__)
 
 config.connections.astrometry_ref_cat = "uw_stars_20240524"
 config.connections.photometry_ref_cat = "uw_stars_20240524"
 
-config.astrometry_ref_loader.load(os.path.join(configDir, "filterMap.py"))
-config.photometry_ref_loader.load(os.path.join(configDir, "filterMap.py"))
+config.astrometry_ref_loader.load("filterMap.py")
+config.photometry_ref_loader.load("filterMap.py")
 config.astrometry_ref_loader.anyFilterMapsToThis = None
 config.photometry_ref_loader.anyFilterMapsToThis = None
 
@@ -30,4 +27,4 @@
 config.photometry.match.referenceSelection.magLimit.maximum = 22.0
 
 # Exposure summary stats
-config.compute_summary_stats.load(os.path.join(configDir, "computeExposureSummaryStats.py"))
+config.compute_summary_stats.load("computeExposureSummaryStats.py")
diff --git a/config/comCamSim/computeExposureSummaryStats.py b/config/comCamSim/computeExposureSummaryStats.py
index 06f799fe4..ed2c648d7 100644
--- a/config/comCamSim/computeExposureSummaryStats.py
+++ b/config/comCamSim/computeExposureSummaryStats.py
@@ -1,7 +1,3 @@
-import os.path
-
-config_dir = os.path.dirname(__file__)
-
-config.load(os.path.join(config_dir, "fiducialPsfSigma.py"))
-config.load(os.path.join(config_dir, "fiducialSkyBackground.py"))
-config.load(os.path.join(config_dir, "fiducialZeroPoint.py"))
+config.load("fiducialPsfSigma.py")
+config.load("fiducialSkyBackground.py")
+config.load("fiducialZeroPoint.py")
diff --git a/config/comCamSim/fgcmBuildFromIsolatedStars.py b/config/comCamSim/fgcmBuildFromIsolatedStars.py
index 0edda9e30..f34b5eb17 100644
--- a/config/comCamSim/fgcmBuildFromIsolatedStars.py
+++ b/config/comCamSim/fgcmBuildFromIsolatedStars.py
@@ -1,5 +1,3 @@
-import os
-
 physical_to_band = {
     "g_01": "g",
     "r_03": "r",
@@ -14,7 +12,6 @@
 config.minPerBand = 2
 config.connections.ref_cat = "uw_stars_20240524"
 
-configDir = os.path.join(os.path.dirname(__file__))
 config.physicalFilterMap = physical_to_band
 config.fgcmLoadReferenceCatalog.filterMap = {
     "g": "lsst_g",
diff --git a/config/comCamSim/reprocessVisitImage.py b/config/comCamSim/reprocessVisitImage.py
index c5273542c..715d8b46b 100644
--- a/config/comCamSim/reprocessVisitImage.py
+++ b/config/comCamSim/reprocessVisitImage.py
@@ -1,6 +1,2 @@
 #!/usr/bin/env python
-import os.path
-
-ObsConfigDir = os.path.dirname(__file__)
-
-config.compute_summary_stats.load(os.path.join(ObsConfigDir, "computeExposureSummaryStats.py"))
+config.compute_summary_stats.load("computeExposureSummaryStats.py")
diff --git a/config/comCamSim/updateVisitSummary.py b/config/comCamSim/updateVisitSummary.py
index c5273542c..715d8b46b 100644
--- a/config/comCamSim/updateVisitSummary.py
+++ b/config/comCamSim/updateVisitSummary.py
@@ -1,6 +1,2 @@
 #!/usr/bin/env python
-import os.path
-
-ObsConfigDir = os.path.dirname(__file__)
-
-config.compute_summary_stats.load(os.path.join(ObsConfigDir, "computeExposureSummaryStats.py"))
+config.compute_summary_stats.load("computeExposureSummaryStats.py")
diff --git a/config/compareWarpAssembleCoadd.py b/config/compareWarpAssembleCoadd.py
index a56469f05..0ad1ec212 100644
--- a/config/compareWarpAssembleCoadd.py
+++ b/config/compareWarpAssembleCoadd.py
@@ -20,10 +20,8 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
 # Load configs from base assembleCoadd
-config.load(os.path.join(os.path.dirname(__file__), "assembleCoadd.py"))
+config.load("assembleCoadd.py")
 
 # 200 rows (since patch width is typically < 10k pixels
 config.assembleStaticSkyModel.subregionSize = (10000, 200)
diff --git a/config/dark.py b/config/dark.py
index d0f6e94f2..a88dbadbe 100644
--- a/config/dark.py
+++ b/config/dark.py
@@ -20,9 +20,7 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "lsstCamCommon.py"))
-config.isr.load(os.path.join(os.path.dirname(__file__), "isr.py"))
+config.load("lsstCamCommon.py")
+config.isr.load("isr.py")
 
 config.repair.cosmicray.nCrPixelMax = 100000
diff --git a/config/findDefects.py b/config/findDefects.py
index 9f353360c..925efaa96 100644
--- a/config/findDefects.py
+++ b/config/findDefects.py
@@ -1,4 +1,2 @@
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "lsstCamCommon.py"))
+config.load("lsstCamCommon.py")
 config.ccdKey = "detector"
diff --git a/config/flat.py b/config/flat.py
index 6cde08506..107429716 100644
--- a/config/flat.py
+++ b/config/flat.py
@@ -20,7 +20,5 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "lsstCamCommon.py"))
-config.isr.load(os.path.join(os.path.dirname(__file__), "isr.py"))
+config.load("lsstCamCommon.py")
+config.isr.load("isr.py")
diff --git a/config/forcedPhotCcd.py b/config/forcedPhotCcd.py
index 6996ea08a..18e9903d7 100644
--- a/config/forcedPhotCcd.py
+++ b/config/forcedPhotCcd.py
@@ -20,9 +20,7 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.measurement.load(os.path.join(os.path.dirname(__file__), "apertures.py"))
+config.measurement.load("apertures.py")
 
 # We only need the 12 pixel aperture for subsequent measurements.
 config.measurement.plugins["base_CircularApertureFlux"].radii = [12.0]
diff --git a/config/forcedPhotCoadd.py b/config/forcedPhotCoadd.py
index 4572f62d2..c50da6ce0 100644
--- a/config/forcedPhotCoadd.py
+++ b/config/forcedPhotCoadd.py
@@ -20,13 +20,11 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.measurement.load(os.path.join(os.path.dirname(__file__), "apertures.py"))
-config.measurement.load(os.path.join(os.path.dirname(__file__), "kron.py"))
-config.measurement.load(os.path.join(os.path.dirname(__file__), "convolvedFluxes.py"))
-config.measurement.load(os.path.join(os.path.dirname(__file__), "gaap.py"))
-config.load(os.path.join(os.path.dirname(__file__), "cmodel.py"))
+config.measurement.load("apertures.py")
+config.measurement.load("kron.py")
+config.measurement.load("convolvedFluxes.py")
+config.measurement.load("gaap.py")
+config.load("cmodel.py")
 
 config.measurement.slots.gaussianFlux = None
 
diff --git a/config/hsm.py b/config/hsm.py
index b4f065577..00f8ed75f 100644
--- a/config/hsm.py
+++ b/config/hsm.py
@@ -23,11 +23,8 @@
 
 # Enable HSM shapes (unsetup meas_extensions_shapeHSM to disable)
 # 'config' is a SourceMeasurementConfig.
-import os.path
-from lsst.utils import getPackageDir
-
 try:
-    config.load(os.path.join(getPackageDir("meas_extensions_shapeHSM"), "config", "enable.py"))
+    config.load("eups://meas_extensions_shapeHSM/config/enable.py")
     config.plugins["ext_shapeHSM_HsmShapeRegauss"].deblendNChild = "deblend_nChild"
     # Enable debiased moments
     config.plugins.names |= ["ext_shapeHSM_HsmPsfMomentsDebiased"]
diff --git a/config/imsim/analysisToolsPhotometricCatalogMatch.py b/config/imsim/analysisToolsPhotometricCatalogMatch.py
index 109c4190d..de650bb87 100644
--- a/config/imsim/analysisToolsPhotometricCatalogMatch.py
+++ b/config/imsim/analysisToolsPhotometricCatalogMatch.py
@@ -1,6 +1,3 @@
-import os.path
-
-configDir = os.path.dirname(__file__)
-config.referenceCatalogLoader.refObjLoader.load(os.path.join(configDir, "filterMap.py"))
+config.referenceCatalogLoader.refObjLoader.load("filterMap.py")
 config.referenceCatalogLoader.doApplyColorTerms = False
 config.connections.refCatalog = "cal_ref_cat_2_2"
diff --git a/config/imsim/analysisToolsPhotometricCatalogMatchVisit.py b/config/imsim/analysisToolsPhotometricCatalogMatchVisit.py
index 109c4190d..de650bb87 100644
--- a/config/imsim/analysisToolsPhotometricCatalogMatchVisit.py
+++ b/config/imsim/analysisToolsPhotometricCatalogMatchVisit.py
@@ -1,6 +1,3 @@
-import os.path
-
-configDir = os.path.dirname(__file__)
-config.referenceCatalogLoader.refObjLoader.load(os.path.join(configDir, "filterMap.py"))
+config.referenceCatalogLoader.refObjLoader.load("filterMap.py")
 config.referenceCatalogLoader.doApplyColorTerms = False
 config.connections.refCatalog = "cal_ref_cat_2_2"
diff --git a/config/imsim/calibrate.py b/config/imsim/calibrate.py
index fc1aa9424..032eab3ba 100644
--- a/config/imsim/calibrate.py
+++ b/config/imsim/calibrate.py
@@ -22,15 +22,12 @@
 """
 imsim-specific overrides for CalibrateTask
 """
-import os.path
-
-configDir = os.path.dirname(__file__)
 
 # imSim-specifc reference catalog configuration.
 config.connections.astromRefCat = "cal_ref_cat"
 config.connections.photoRefCat = "cal_ref_cat"
-config.astromRefObjLoader.load(os.path.join(configDir, "filterMap.py"))
-config.photoRefObjLoader.load(os.path.join(configDir, "filterMap.py"))
+config.astromRefObjLoader.load("filterMap.py")
+config.photoRefObjLoader.load("filterMap.py")
 config.astromRefObjLoader.anyFilterMapsToThis = None
 
 # Reduce Chebyshev polynomial order for background fitting (DM-30820)
diff --git a/config/imsim/calibrateImage.py b/config/imsim/calibrateImage.py
index 1ac28ab0e..1396ce7e9 100644
--- a/config/imsim/calibrateImage.py
+++ b/config/imsim/calibrateImage.py
@@ -1,9 +1,6 @@
 """
 ImSim-specific overrides for CalibrateImageTask
 """
-import os
-
-config_dir = os.path.join(os.path.dirname(__file__))
 
 # imsim background model is a single value per detector.
 config.psf_subtract_background.approxOrderX = 1
@@ -20,9 +17,9 @@
 config.connections.astrometry_ref_cat = "cal_ref_cat_2_2"
 config.connections.photometry_ref_cat = "cal_ref_cat_2_2"
 # Use the ImSim filterMap ("lsst_X_smeared" reference fluxes).
-config.astrometry_ref_loader.load(os.path.join(config_dir, "filterMap.py"))
+config.astrometry_ref_loader.load("filterMap.py")
 config.astrometry_ref_loader.anyFilterMapsToThis = None
-config.photometry_ref_loader.load(os.path.join(config_dir, "filterMap.py"))
+config.photometry_ref_loader.load("filterMap.py")
 
 # Make sure galaxies from truth catalog are not used for calibration.
 config.astrometry.referenceSelector.doUnresolved = True
diff --git a/config/imsim/characterizeImage.py b/config/imsim/characterizeImage.py
index fac611d33..d682f7105 100644
--- a/config/imsim/characterizeImage.py
+++ b/config/imsim/characterizeImage.py
@@ -23,15 +23,11 @@
 imsim-specific overrides for CharacterizeImageTask
 """
 
-import os.path
-
-obsConfigDir = os.path.join(os.path.dirname(__file__))
-
-config.load(os.path.join(obsConfigDir, "..", "cmodel.py"))
-config.measurement.load(os.path.join(obsConfigDir, "..", "kron.py"))
-config.measurement.load(os.path.join(obsConfigDir, "..", "convolvedFluxes.py"))
-config.measurement.load(os.path.join(obsConfigDir, "..", "gaap.py"))
-config.measurement.load(os.path.join(obsConfigDir, "..", "hsm.py"))
+config.load("../cmodel.py")
+config.measurement.load("../kron.py")
+config.measurement.load("../convolvedFluxes.py")
+config.measurement.load("../gaap.py")
+config.measurement.load("../hsm.py")
 
 if "ext_shapeHSM_HsmShapeRegauss" in config.measurement.plugins:
     # no deblending has been done
diff --git a/config/imsim/convertRepo.py b/config/imsim/convertRepo.py
index 4335238a4..59e1e3cc3 100644
--- a/config/imsim/convertRepo.py
+++ b/config/imsim/convertRepo.py
@@ -1,9 +1,7 @@
-import os.path
-
 from lsst.obs.base.gen2to3 import ConvertRepoSkyMapConfig
 
 config.skyMaps["DC2"] = ConvertRepoSkyMapConfig()
-config.skyMaps["DC2"].load(os.path.join(os.path.dirname(__file__), "..", "makeSkyMap.py"))
+config.skyMaps["DC2"].load("../makeSkyMap.py")
 # If there's no skymap in the root repo, but some dataset defined on
 # tracts/patches is present there (i.e. brightObjectMask), assume this
 # skymap.
diff --git a/config/imsim/jointcal.py b/config/imsim/jointcal.py
index 1f53ceb59..daa3c393a 100644
--- a/config/imsim/jointcal.py
+++ b/config/imsim/jointcal.py
@@ -20,11 +20,9 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
 # existing synthetic refcat does not have coordinate errors
 config.astrometryReferenceErr = 1
 
-filterMapFile = os.path.join(os.path.dirname(__file__), "filterMap.py")
+filterMapFile = "filterMap.py"
 config.astrometryRefObjLoader.load(filterMapFile)
 config.photometryRefObjLoader.load(filterMapFile)
diff --git a/config/latiss/analysisToolsAstrometricCatalogMatch.py b/config/latiss/analysisToolsAstrometricCatalogMatch.py
index 7cd22e90b..df30d3bfb 100644
--- a/config/latiss/analysisToolsAstrometricCatalogMatch.py
+++ b/config/latiss/analysisToolsAstrometricCatalogMatch.py
@@ -1,7 +1,6 @@
-import os.path
 from lsst.pipe.tasks.postprocess import TransformObjectCatalogConfig
 
 # By default loop over all the same bands that are present in the Object Table
 objectConfig = TransformObjectCatalogConfig()
-objectConfig.load(os.path.join(os.path.dirname(__file__), "transformObjectCatalog.py"))
+objectConfig.load("transformObjectCatalog.py")
 config.bands = objectConfig.outputBands
diff --git a/config/latiss/analysisToolsPhotometricCatalogMatch.py b/config/latiss/analysisToolsPhotometricCatalogMatch.py
index 9a3168698..6673adeaa 100644
--- a/config/latiss/analysisToolsPhotometricCatalogMatch.py
+++ b/config/latiss/analysisToolsPhotometricCatalogMatch.py
@@ -1,10 +1,6 @@
-import os.path
-
-OBS_CONFIG_DIR = os.path.dirname(__file__)
-
-config.referenceCatalogLoader.refObjLoader.load(os.path.join(OBS_CONFIG_DIR, "filterMap.py"))
+config.referenceCatalogLoader.refObjLoader.load("filterMap.py")
 config.referenceCatalogLoader.doApplyColorTerms = True
-config.referenceCatalogLoader.colorterms.load(os.path.join(OBS_CONFIG_DIR, "colorterms.py"))
+config.referenceCatalogLoader.colorterms.load("colorterms.py")
 
 config.connections.refCatalog = "atlas_refcat2_20220201"
 config.filterNames = ["SDSSg_65mm~empty",
diff --git a/config/latiss/analysisToolsPhotometricCatalogMatchVisit.py b/config/latiss/analysisToolsPhotometricCatalogMatchVisit.py
index 1ac7543d9..ce08532bb 100644
--- a/config/latiss/analysisToolsPhotometricCatalogMatchVisit.py
+++ b/config/latiss/analysisToolsPhotometricCatalogMatchVisit.py
@@ -1,9 +1,5 @@
-import os.path
-
-OBS_CONFIG_DIR = os.path.dirname(__file__)
-
-config.referenceCatalogLoader.refObjLoader.load(os.path.join(OBS_CONFIG_DIR, "filterMap.py"))
+config.referenceCatalogLoader.refObjLoader.load("filterMap.py")
 config.referenceCatalogLoader.doApplyColorTerms = True
-config.referenceCatalogLoader.colorterms.load(os.path.join(OBS_CONFIG_DIR, "colorterms.py"))
+config.referenceCatalogLoader.colorterms.load("colorterms.py")
 
 config.connections.refCatalog = "atlas_refcat2_20220201"
diff --git a/config/latiss/associatedSourcesTractAnalysis.py b/config/latiss/associatedSourcesTractAnalysis.py
index 243d0d5d0..0992a3a55 100644
--- a/config/latiss/associatedSourcesTractAnalysis.py
+++ b/config/latiss/associatedSourcesTractAnalysis.py
@@ -1,9 +1,8 @@
-import os.path
 from lsst.pipe.tasks.postprocess import TransformObjectCatalogConfig
 
 # By default loop over all the same bands that are present in the Object Table
 objectConfig = TransformObjectCatalogConfig()
-objectConfig.load(os.path.join(os.path.dirname(__file__), "transformObjectCatalog.py"))
+objectConfig.load("transformObjectCatalog.py")
 config.bands = objectConfig.outputBands
 # gbdesAstrometricFitTask is not run for latiss, so there is no proper motion
 # catalog to use here.
diff --git a/config/latiss/bias.py b/config/latiss/bias.py
index d1e7719db..f8d9c4c69 100644
--- a/config/latiss/bias.py
+++ b/config/latiss/bias.py
@@ -20,6 +20,4 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "latiss.py"))
+config.load("latiss.py")
diff --git a/config/latiss/calibrate.py b/config/latiss/calibrate.py
index 81775b775..af717d2fd 100644
--- a/config/latiss/calibrate.py
+++ b/config/latiss/calibrate.py
@@ -1,20 +1,16 @@
-import os.path
-
 from lsst.meas.algorithms import ColorLimit
 from lsst.meas.astrom import FitAffineWcsTask
 
-obsConfigDir = os.path.dirname(__file__)
-
 config.photoCal.match.referenceSelection.magLimit.fluxField = "r_flux"
 colors = config.photoCal.match.referenceSelection.colorLimits
 colors["g-r"] = ColorLimit(primary="g_flux", secondary="r_flux", minimum=0.4, maximum=2.0)
 config.photoCal.applyColorTerms = True
 config.photoCal.photoCatName = "atlas_refcat2_20220201"
 config.connections.photoRefCat = "atlas_refcat2_20220201"
-config.photoCal.colorterms.load(os.path.join(obsConfigDir, "colorterms.py"))
+config.photoCal.colorterms.load("colorterms.py")
 
 # Configure the photometry to use atlas_refcat2.
-config.photoRefObjLoader.load(os.path.join(obsConfigDir, "filterMap.py"))
+config.photoRefObjLoader.load("filterMap.py")
 
 # We often have very few sources due to smaller aperture so use affine task.
 config.astrometry.wcsFitter.retarget(FitAffineWcsTask)
diff --git a/config/latiss/calibrateImage.py b/config/latiss/calibrateImage.py
index c9beed4b4..eba13f54b 100644
--- a/config/latiss/calibrateImage.py
+++ b/config/latiss/calibrateImage.py
@@ -1,9 +1,5 @@
-import os.path
-
 from lsst.meas.algorithms import ColorLimit
 
-config_dir = os.path.dirname(__file__)
-
 # Some modifications to the objectSize selector for PSF estimation optimized
 # for LATISS data.
 config.psf_measure_psf.starSelector["objectSize"].signalToNoiseMin = 10
@@ -46,7 +42,7 @@
 
 # Configure the photometry to use atlas_refcat2.
 config.connections.photometry_ref_cat = "atlas_refcat2_20220201"
-config.photometry_ref_loader.load(os.path.join(config_dir, "filterMap.py"))
+config.photometry_ref_loader.load("filterMap.py")
 
 config.photometry.match.referenceSelection.magLimit.fluxField = "r_flux"
 colors = config.photometry.match.referenceSelection.colorLimits
@@ -54,7 +50,7 @@
 
 config.photometry.applyColorTerms = True
 config.photometry.photoCatName = "atlas_refcat2_20220201"
-config.photometry.colorterms.load(os.path.join(config_dir, "colorterms.py"))
+config.photometry.colorterms.load("colorterms.py")
 
 # Note that the following two config values were validated on data taken in
 # 2022-11 and 2022-12, which is after some major improvements were made to
diff --git a/config/latiss/compareWarpAssembleCoadd.py b/config/latiss/compareWarpAssembleCoadd.py
index aea99f279..26edd5d22 100644
--- a/config/latiss/compareWarpAssembleCoadd.py
+++ b/config/latiss/compareWarpAssembleCoadd.py
@@ -20,7 +20,5 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
 # Load configs from base assembleCoadd
-config.load(os.path.join(os.path.dirname(__file__), "assembleCoadd.py"))
+config.load("assembleCoadd.py")
diff --git a/config/latiss/dark.py b/config/latiss/dark.py
index d1e7719db..f8d9c4c69 100644
--- a/config/latiss/dark.py
+++ b/config/latiss/dark.py
@@ -20,6 +20,4 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "latiss.py"))
+config.load("latiss.py")
diff --git a/config/latiss/fgcmBuildFromIsolatedStars.py b/config/latiss/fgcmBuildFromIsolatedStars.py
index aff7e590b..2354cafd3 100644
--- a/config/latiss/fgcmBuildFromIsolatedStars.py
+++ b/config/latiss/fgcmBuildFromIsolatedStars.py
@@ -1,4 +1,3 @@
-import os
 from lsst.obs.lsst.filters import LATISS_FILTER_DEFINITIONS
 
 
@@ -13,12 +12,11 @@
 config.apertureInnerInstFluxField = "apFlux_35_0_instFlux"
 config.apertureOuterInstFluxField = "apFlux_50_0_instFlux"
 
-configDir = os.path.join(os.path.dirname(__file__))
 config.physicalFilterMap = LATISS_FILTER_DEFINITIONS.physical_to_band
 config.doSubtractLocalBackground = False
-config.fgcmLoadReferenceCatalog.load(os.path.join(configDir, "filterMap.py"))
+config.fgcmLoadReferenceCatalog.load("filterMap.py")
 config.fgcmLoadReferenceCatalog.applyColorTerms = True
-config.fgcmLoadReferenceCatalog.colorterms.load(os.path.join(configDir, "colorterms.py"))
+config.fgcmLoadReferenceCatalog.colorterms.load("colorterms.py")
 config.fgcmLoadReferenceCatalog.referenceSelector.doSignalToNoise = True
 config.fgcmLoadReferenceCatalog.referenceSelector.signalToNoise.fluxField = "i_flux"
 config.fgcmLoadReferenceCatalog.referenceSelector.signalToNoise.errField = "i_fluxErr"
diff --git a/config/latiss/flat.py b/config/latiss/flat.py
index d1e7719db..f8d9c4c69 100644
--- a/config/latiss/flat.py
+++ b/config/latiss/flat.py
@@ -20,6 +20,4 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "latiss.py"))
+config.load("latiss.py")
diff --git a/config/latiss/fringe.py b/config/latiss/fringe.py
index d1e7719db..f8d9c4c69 100644
--- a/config/latiss/fringe.py
+++ b/config/latiss/fringe.py
@@ -20,6 +20,4 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "latiss.py"))
+config.load("latiss.py")
diff --git a/config/latiss/measureCoaddSources.py b/config/latiss/measureCoaddSources.py
index 14c8d208c..8b9096a50 100644
--- a/config/latiss/measureCoaddSources.py
+++ b/config/latiss/measureCoaddSources.py
@@ -22,10 +22,8 @@
 
 """LATISS-specific overrides for MeasureMergedCoaddSourcesTask"""
 
-import os.path
-
-config.measurement.load(os.path.join(os.path.dirname(__file__), "..", "apertures.py"))
-config.measurement.load(os.path.join(os.path.dirname(__file__), "..", "kron.py"))
-config.measurement.load(os.path.join(os.path.dirname(__file__), "..", "convolvedFluxes.py"))
-config.measurement.load(os.path.join(os.path.dirname(__file__), "..", "hsm.py"))
-config.load(os.path.join(os.path.dirname(__file__), "..", "cmodel.py"))
+config.measurement.load("../apertures.py")
+config.measurement.load("../kron.py")
+config.measurement.load("../convolvedFluxes.py")
+config.measurement.load("../hsm.py")
+config.load("../cmodel.py")
diff --git a/config/latiss/objectTableTractAnalysis.py b/config/latiss/objectTableTractAnalysis.py
index 7cd22e90b..df30d3bfb 100644
--- a/config/latiss/objectTableTractAnalysis.py
+++ b/config/latiss/objectTableTractAnalysis.py
@@ -1,7 +1,6 @@
-import os.path
 from lsst.pipe.tasks.postprocess import TransformObjectCatalogConfig
 
 # By default loop over all the same bands that are present in the Object Table
 objectConfig = TransformObjectCatalogConfig()
-objectConfig.load(os.path.join(os.path.dirname(__file__), "transformObjectCatalog.py"))
+objectConfig.load("transformObjectCatalog.py")
 config.bands = objectConfig.outputBands
diff --git a/config/latiss/processStar.py b/config/latiss/processStar.py
index dd6c45b55..287ffe1a4 100644
--- a/config/latiss/processStar.py
+++ b/config/latiss/processStar.py
@@ -1,6 +1,4 @@
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "latiss.py"))
+config.load("latiss.py")
 
 # Configuration for processStarTask
 
diff --git a/config/latiss/refCatObjectAnalysisTask.py b/config/latiss/refCatObjectAnalysisTask.py
index 7cd22e90b..df30d3bfb 100644
--- a/config/latiss/refCatObjectAnalysisTask.py
+++ b/config/latiss/refCatObjectAnalysisTask.py
@@ -1,7 +1,6 @@
-import os.path
 from lsst.pipe.tasks.postprocess import TransformObjectCatalogConfig
 
 # By default loop over all the same bands that are present in the Object Table
 objectConfig = TransformObjectCatalogConfig()
-objectConfig.load(os.path.join(os.path.dirname(__file__), "transformObjectCatalog.py"))
+objectConfig.load("transformObjectCatalog.py")
 config.bands = objectConfig.outputBands
diff --git a/config/latiss/refCatObjectPhotometricAnalysisTask.py b/config/latiss/refCatObjectPhotometricAnalysisTask.py
index b5638f8a0..3e795b881 100644
--- a/config/latiss/refCatObjectPhotometricAnalysisTask.py
+++ b/config/latiss/refCatObjectPhotometricAnalysisTask.py
@@ -1,9 +1,8 @@
-import os.path
 from lsst.pipe.tasks.postprocess import TransformObjectCatalogConfig
 
 # By default loop over all the same bands that are present in the Object Table
 objectConfig = TransformObjectCatalogConfig()
-objectConfig.load(os.path.join(os.path.dirname(__file__), "transformObjectCatalog.py"))
+objectConfig.load("transformObjectCatalog.py")
 config.bands = objectConfig.outputBands
 
 config.connections.refCatalog = "atlas_refcat2_20220201"
diff --git a/config/latiss/refCatSourcePhotometricAnalysisTask.py b/config/latiss/refCatSourcePhotometricAnalysisTask.py
index d4e6946b8..c16f83fd3 100644
--- a/config/latiss/refCatSourcePhotometricAnalysisTask.py
+++ b/config/latiss/refCatSourcePhotometricAnalysisTask.py
@@ -1,9 +1,8 @@
-import os.path
 from lsst.pipe.tasks.postprocess import TransformObjectCatalogConfig
 
 # By default loop over all the same bands that are present in the Object Table
 objectConfig = TransformObjectCatalogConfig()
-objectConfig.load(os.path.join(os.path.dirname(__file__), "transformObjectCatalog.py"))
+objectConfig.load("transformObjectCatalog.py")
 config.bands = objectConfig.outputBands
 
 config.connections.refCatalog = "atlas_refcat2_20220201"
diff --git a/config/lsstCam/analysisToolsPhotometricCatalogMatch.py b/config/lsstCam/analysisToolsPhotometricCatalogMatch.py
index 7c5e59389..79b398d9d 100644
--- a/config/lsstCam/analysisToolsPhotometricCatalogMatch.py
+++ b/config/lsstCam/analysisToolsPhotometricCatalogMatch.py
@@ -1,7 +1,4 @@
 """Overrides for PhotometricCatalogMatchTask"""
 
-import os.path
-
-configDir = os.path.dirname(__file__)
-config.referenceCatalogLoader.refObjLoader.load(os.path.join(configDir, "filterMap.py"))
+config.referenceCatalogLoader.refObjLoader.load("filterMap.py")
 config.referenceCatalogLoader.doApplyColorTerms = False
diff --git a/config/lsstCam/analysisToolsPhotometricCatalogMatchVisit.py b/config/lsstCam/analysisToolsPhotometricCatalogMatchVisit.py
index 7c5e59389..79b398d9d 100644
--- a/config/lsstCam/analysisToolsPhotometricCatalogMatchVisit.py
+++ b/config/lsstCam/analysisToolsPhotometricCatalogMatchVisit.py
@@ -1,7 +1,4 @@
 """Overrides for PhotometricCatalogMatchTask"""
 
-import os.path
-
-configDir = os.path.dirname(__file__)
-config.referenceCatalogLoader.refObjLoader.load(os.path.join(configDir, "filterMap.py"))
+config.referenceCatalogLoader.refObjLoader.load("filterMap.py")
 config.referenceCatalogLoader.doApplyColorTerms = False
diff --git a/config/lsstCam/calibrate.py b/config/lsstCam/calibrate.py
index 755759513..1bc4b2f0b 100644
--- a/config/lsstCam/calibrate.py
+++ b/config/lsstCam/calibrate.py
@@ -1,8 +1,6 @@
-import os
 from lsst.meas.algorithms import ColorLimit  # Configure the photometry to use the_monster.
 
-obsConfigDir = os.path.join(os.path.dirname(__file__))
-config.photoRefObjLoader.load(os.path.join(obsConfigDir, "filterMap.py"))
+config.photoRefObjLoader.load("filterMap.py")
 config.connections.astromRefCat = "the_monster_20250219"
 # photometric reference catalog defaults to the_monster_20250219 one level up
 # photoCal.applyColorTerms = False one level up
@@ -27,10 +25,10 @@
 
 # Overrides to improved astrometry matching.
 config.astrometry.doFiducialZeroPointCull = True
-config.astrometry.load(os.path.join(obsConfigDir, "fiducialZeroPoint.py"))
+config.astrometry.load("fiducialZeroPoint.py")
 
 # Loosened for early ComCam with large PSFs.
 config.photoCal.match.sourceSelection.doUnresolved = False
 
 # Exposure summary stats.
-config.computeSummaryStats.load(os.path.join(obsConfigDir, "computeExposureSummaryStats.py"))
+config.computeSummaryStats.load("computeExposureSummaryStats.py")
diff --git a/config/lsstCam/calibrateImage.py b/config/lsstCam/calibrateImage.py
index 33d05d396..04614874f 100644
--- a/config/lsstCam/calibrateImage.py
+++ b/config/lsstCam/calibrateImage.py
@@ -1,14 +1,10 @@
-import os.path
-
 from lsst.meas.algorithms import ColorLimit  # Configure the photometry to use the_monster.
 
-config_dir = os.path.dirname(__file__)
-
 config.connections.photometry_ref_cat = "the_monster_20250219"
 config.connections.astrometry_ref_cat = "the_monster_20250219"
 
-config.astrometry.load(os.path.join(config_dir, "filterMap.py"))
-config.photometry_ref_loader.load(os.path.join(config_dir, "filterMap.py"))
+config.astrometry.load("filterMap.py")
+config.photometry_ref_loader.load("filterMap.py")
 
 config.photometry.match.referenceSelection.magLimit.fluxField = "monster_ComCam_r_flux"
 colors = config.photometry.match.referenceSelection.colorLimits
@@ -22,7 +18,7 @@
 config.photometry.applyColorTerms = False
 config.photometry.photoCatName = "the_monster_20250219"
 
-config.compute_summary_stats.load(os.path.join(config_dir, "computeExposureSummaryStats.py"))
+config.compute_summary_stats.load("computeExposureSummaryStats.py")
 
 # Decrease maximum number of reference sources
 config.astrometry.matcher.maxRefObjects = 4096
@@ -41,7 +37,7 @@
 
 # Overrides to improved astrometry matching.
 config.astrometry.doFiducialZeroPointCull = True
-config.astrometry.load(os.path.join(config_dir, "fiducialZeroPoint.py"))
+config.astrometry.load("fiducialZeroPoint.py")
 
 # Loosened for early LSSTCam with large PSFs.
 config.photometry.match.sourceSelection.doUnresolved = False
diff --git a/config/lsstCam/compareWarpAssembleCoadd.py b/config/lsstCam/compareWarpAssembleCoadd.py
index 2bd4cc116..1d7f9e345 100644
--- a/config/lsstCam/compareWarpAssembleCoadd.py
+++ b/config/lsstCam/compareWarpAssembleCoadd.py
@@ -1,10 +1,9 @@
 """
 lsstCam-specific overrides of CompareWarpAssembleCoaddTask
 """
-import os.path
 
 # Load configs from base assembleCoadd
-config.load(os.path.join(os.path.dirname(__file__), "assembleCoadd.py"))
+config.load("assembleCoadd.py")
 
 # Preliminary aggressive adjustment to accomodate early commissioning
 # deep-drilling-style cadence with many observations
diff --git a/config/lsstCam/computeExposureSummaryStats.py b/config/lsstCam/computeExposureSummaryStats.py
index 06f799fe4..ed2c648d7 100644
--- a/config/lsstCam/computeExposureSummaryStats.py
+++ b/config/lsstCam/computeExposureSummaryStats.py
@@ -1,7 +1,3 @@
-import os.path
-
-config_dir = os.path.dirname(__file__)
-
-config.load(os.path.join(config_dir, "fiducialPsfSigma.py"))
-config.load(os.path.join(config_dir, "fiducialSkyBackground.py"))
-config.load(os.path.join(config_dir, "fiducialZeroPoint.py"))
+config.load("fiducialPsfSigma.py")
+config.load("fiducialSkyBackground.py")
+config.load("fiducialZeroPoint.py")
diff --git a/config/lsstCam/fgcmBuildFromIsolatedStars.py b/config/lsstCam/fgcmBuildFromIsolatedStars.py
index f2ae2f5de..32bd4f7c8 100644
--- a/config/lsstCam/fgcmBuildFromIsolatedStars.py
+++ b/config/lsstCam/fgcmBuildFromIsolatedStars.py
@@ -1,5 +1,3 @@
-import os
-
 physical_to_band = {
     "u_24": "u",
     "g_6": "g",
@@ -16,10 +14,8 @@
 
 config.connections.ref_cat = "the_monster_20250219"
 
-configDir = os.path.join(os.path.dirname(__file__))
 config.physicalFilterMap = physical_to_band
-obsConfigDir = os.path.join(os.path.dirname(__file__))
-config.fgcmLoadReferenceCatalog.load(os.path.join(obsConfigDir, "filterMap.py"))
+config.fgcmLoadReferenceCatalog.load("filterMap.py")
 config.fgcmLoadReferenceCatalog.applyColorTerms = False
 config.fgcmLoadReferenceCatalog.referenceSelector.doSignalToNoise = True
 config.fgcmLoadReferenceCatalog.referenceSelector.signalToNoise.fluxField = "monster_ComCam_i_flux"
diff --git a/config/lsstCam/finalize_characterization_detector.py b/config/lsstCam/finalize_characterization_detector.py
index 9943467d7..b853923a3 100644
--- a/config/lsstCam/finalize_characterization_detector.py
+++ b/config/lsstCam/finalize_characterization_detector.py
@@ -1,3 +1 @@
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "finalize_characterization.py"))
+config.load("finalize_characterization.py")
diff --git a/config/lsstCam/reprocessVisitImage.py b/config/lsstCam/reprocessVisitImage.py
index c5273542c..715d8b46b 100644
--- a/config/lsstCam/reprocessVisitImage.py
+++ b/config/lsstCam/reprocessVisitImage.py
@@ -1,6 +1,2 @@
 #!/usr/bin/env python
-import os.path
-
-ObsConfigDir = os.path.dirname(__file__)
-
-config.compute_summary_stats.load(os.path.join(ObsConfigDir, "computeExposureSummaryStats.py"))
+config.compute_summary_stats.load("computeExposureSummaryStats.py")
diff --git a/config/lsstCam/updateVisitSummary.py b/config/lsstCam/updateVisitSummary.py
index 4cb12e009..678d3fb4a 100644
--- a/config/lsstCam/updateVisitSummary.py
+++ b/config/lsstCam/updateVisitSummary.py
@@ -1,8 +1,5 @@
 #!/usr/bin/env python
-import os.path
 
-ObsConfigDir = os.path.dirname(__file__)
-
-config.compute_summary_stats.load(os.path.join(ObsConfigDir, "computeExposureSummaryStats.py"))
+config.compute_summary_stats.load("computeExposureSummaryStats.py")
 
 config.connections.wcs_overrides_skypix = "turbulenceCorrectedSkyWcsCatalog"
diff --git a/config/measureCoaddSources.py b/config/measureCoaddSources.py
index f769f0e5e..08425036e 100644
--- a/config/measureCoaddSources.py
+++ b/config/measureCoaddSources.py
@@ -20,12 +20,10 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.measurement.load(os.path.join(os.path.dirname(__file__), "apertures.py"))
-config.measurement.load(os.path.join(os.path.dirname(__file__), "kron.py"))
-config.measurement.load(os.path.join(os.path.dirname(__file__), "convolvedFluxes.py"))
-config.measurement.load(os.path.join(os.path.dirname(__file__), "hsm.py"))
-config.load(os.path.join(os.path.dirname(__file__), "cmodel.py"))
+config.measurement.load("apertures.py")
+config.measurement.load("kron.py")
+config.measurement.load("convolvedFluxes.py")
+config.measurement.load("hsm.py")
+config.load("cmodel.py")
 
 config.measurement.plugins.names |= ["base_InputCount"]
diff --git a/config/measurePhotonTransferCurve.py b/config/measurePhotonTransferCurve.py
index 9f353360c..925efaa96 100644
--- a/config/measurePhotonTransferCurve.py
+++ b/config/measurePhotonTransferCurve.py
@@ -1,4 +1,2 @@
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "lsstCamCommon.py"))
+config.load("lsstCamCommon.py")
 config.ccdKey = "detector"
diff --git a/config/mergeCoaddDetections.py b/config/mergeCoaddDetections.py
index 869c8e37c..1241f0970 100644
--- a/config/mergeCoaddDetections.py
+++ b/config/mergeCoaddDetections.py
@@ -1,5 +1,3 @@
-import os.path
-
 # Gen3 mergeDetections will supersede mergeCoaddDetections
 # Keep in sync in the meantime
-config.load(os.path.join(os.path.dirname(__file__), "mergeDetections.py"))
+config.load("mergeDetections.py")
diff --git a/config/mergeCoaddMeasurements.py b/config/mergeCoaddMeasurements.py
index d5bac5426..2c2a79276 100644
--- a/config/mergeCoaddMeasurements.py
+++ b/config/mergeCoaddMeasurements.py
@@ -1,5 +1,3 @@
-import os.path
-
 # Gen3 mergeMeasurements will supersede mergeCoaddMeasurements
 # Keep in sync in the meantime
-config.load(os.path.join(os.path.dirname(__file__), "mergeMeasurements.py"))
+config.load("mergeMeasurements.py")
diff --git a/config/objectTableTractAnalysis.py b/config/objectTableTractAnalysis.py
index 7cd22e90b..df30d3bfb 100644
--- a/config/objectTableTractAnalysis.py
+++ b/config/objectTableTractAnalysis.py
@@ -1,7 +1,6 @@
-import os.path
 from lsst.pipe.tasks.postprocess import TransformObjectCatalogConfig
 
 # By default loop over all the same bands that are present in the Object Table
 objectConfig = TransformObjectCatalogConfig()
-objectConfig.load(os.path.join(os.path.dirname(__file__), "transformObjectCatalog.py"))
+objectConfig.load("transformObjectCatalog.py")
 config.bands = objectConfig.outputBands
diff --git a/config/safeClipAssembleCoadd.py b/config/safeClipAssembleCoadd.py
index aea99f279..26edd5d22 100644
--- a/config/safeClipAssembleCoadd.py
+++ b/config/safeClipAssembleCoadd.py
@@ -20,7 +20,5 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
 # Load configs from base assembleCoadd
-config.load(os.path.join(os.path.dirname(__file__), "assembleCoadd.py"))
+config.load("assembleCoadd.py")
diff --git a/config/sky.py b/config/sky.py
index cc2f297bc..6ba6d1552 100644
--- a/config/sky.py
+++ b/config/sky.py
@@ -20,15 +20,8 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-configDir = os.path.dirname(__file__)
-
-config.load(os.path.join(configDir, "lsstCamCommon.py"))
-config.isr.load(os.path.join(configDir, "isr.py"))
-
-fpBgFile = os.path.join(configDir, "focalPlaneBackground.py")
-
-config.largeScaleBackground.load(fpBgFile)
+config.load("lsstCamCommon.py")
+config.isr.load("isr.py")
+config.largeScaleBackground.load("focalPlaneBackground.py")
 
 config.isr.doBrighterFatter = False
diff --git a/config/skyCorr.py b/config/skyCorr.py
index 704430681..eba63e01d 100644
--- a/config/skyCorr.py
+++ b/config/skyCorr.py
@@ -20,7 +20,4 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-
-import os.path
-
-config.bgModel1.load(os.path.join(os.path.dirname(__file__), "focalPlaneBackground.py"))
+config.bgModel1.load("focalPlaneBackground.py")
diff --git a/config/ts3/bias.py b/config/ts3/bias.py
index 46a417179..d84e675ed 100644
--- a/config/ts3/bias.py
+++ b/config/ts3/bias.py
@@ -20,6 +20,4 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "ts3.py"))
+config.load("ts3.py")
diff --git a/config/ts3/dark.py b/config/ts3/dark.py
index 218d3f247..72556f765 100644
--- a/config/ts3/dark.py
+++ b/config/ts3/dark.py
@@ -20,8 +20,6 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "ts3.py"))
+config.load("ts3.py")
 
 config.repair.cosmicray.nCrPixelMax = 1000000
diff --git a/config/ts3/flat.py b/config/ts3/flat.py
index 46a417179..d84e675ed 100644
--- a/config/ts3/flat.py
+++ b/config/ts3/flat.py
@@ -20,6 +20,4 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "ts3.py"))
+config.load("ts3.py")
diff --git a/config/ts8/bias.py b/config/ts8/bias.py
index 06b6c6ec3..464df6a64 100644
--- a/config/ts8/bias.py
+++ b/config/ts8/bias.py
@@ -20,6 +20,4 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "ts8.py"))
+config.load("ts8.py")
diff --git a/config/ts8/dark.py b/config/ts8/dark.py
index e9b325024..b6960145d 100644
--- a/config/ts8/dark.py
+++ b/config/ts8/dark.py
@@ -20,8 +20,6 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "ts8.py"))
+config.load("ts8.py")
 
 config.repair.cosmicray.nCrPixelMax = 1000000
diff --git a/config/ts8/flat.py b/config/ts8/flat.py
index 06b6c6ec3..464df6a64 100644
--- a/config/ts8/flat.py
+++ b/config/ts8/flat.py
@@ -20,6 +20,4 @@
 # the GNU General Public License along with this program.  If not,
 # see <http://www.lsstcorp.org/LegalNotices/>.
 
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "ts8.py"))
+config.load("ts8.py")
diff --git a/config/ucd/bias.py b/config/ucd/bias.py
index 6c1006b21..ad44d22c9 100644
--- a/config/ucd/bias.py
+++ b/config/ucd/bias.py
@@ -1,3 +1 @@
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "ucd.py"))
+config.load("ucd.py")
diff --git a/config/ucd/dark.py b/config/ucd/dark.py
index 8b6a8f3a9..432631aef 100644
--- a/config/ucd/dark.py
+++ b/config/ucd/dark.py
@@ -1,5 +1,3 @@
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "ucd.py"))
+config.load("ucd.py")
 
 config.repair.cosmicray.nCrPixelMax = 1000000
diff --git a/config/ucd/flat.py b/config/ucd/flat.py
index 6c1006b21..ad44d22c9 100644
--- a/config/ucd/flat.py
+++ b/config/ucd/flat.py
@@ -1,3 +1 @@
-import os.path
-
-config.load(os.path.join(os.path.dirname(__file__), "ucd.py"))
+config.load("ucd.py")
diff --git a/doc/lsst.obs.lsst/testing.rst b/doc/lsst.obs.lsst/testing.rst
index 3b730433e..832463c1e 100644
--- a/doc/lsst.obs.lsst/testing.rst
+++ b/doc/lsst.obs.lsst/testing.rst
@@ -39,13 +39,13 @@ New data can be added as follow:
    template strings to work to be able to locate the file.
 
 -  This file or files
-   should be added to the test butler repository in ``data/input``. Create
-   directory ``data/input/fooCam``, if required, and then run ``butler create`` for that directory to initialize a butler repository.
+   should be added to the test butler repository in ``tests/data/input``. Create
+   directory ``tests/data/input/fooCam``, if required, and then run ``butler create`` for that directory to initialize a butler repository.
    Then ingest your test raw file(s) with:
 
    .. code-block:: bash
 
-      butler ingest-raws data/input/fooCam --transfer copy fooCamtest.fits
+      butler ingest-raws tests/data/input/fooCam --transfer copy fooCamtest.fits
 
    specifying the path to the test files. This will store them in the butler
    repository.
diff --git a/policy/SConscript b/policy/SConscript
index 2744f600b..9bbe16530 100644
--- a/policy/SConscript
+++ b/policy/SConscript
@@ -18,11 +18,14 @@ libpathstr = lsst.sconsUtils.utils.libraryLoaderEnvironment()
 # the shebang
 python = "{} python".format(libpathstr)
 
+output_dir = "../python/lsst/obs/lsst/resources/policy/"
+
 for camera in ["latiss", "lsstCam", "imsim", "phosim", "ts8", "ucd", "ts3", "comCam", "comCamSim", "lsstCamSim"]:
     # Invoke the bin.src variant so that we do not depend on the shebang
-    # target having been run
-    commandInst = env.Command(f"{camera}.yaml", "",
-                              f"{python} bin.src/generateCamera.py --path {camera}:lsstCam:. $TARGET")
+    # target having been run. The output file must be within the real
+    # policy directory for SCons to see it.
+    commandInst = env.Command(f"{camera}.yaml", [],
+                              f"{python} bin.src/generateCamera.py --copy-to {os.path.abspath(output_dir)} --path {camera}:lsstCam:. $TARGET")
 
     env.Depends(commandInst, lsst.sconsUtils.targets["version"])
     env.Depends(commandInst, lsst.sconsUtils.targets["python"])
diff --git a/python/lsst/obs/lsst/_instrument.py b/python/lsst/obs/lsst/_instrument.py
index 16d479bce..bf07757de 100644
--- a/python/lsst/obs/lsst/_instrument.py
+++ b/python/lsst/obs/lsst/_instrument.py
@@ -25,11 +25,10 @@
 
 import datetime
 import hashlib
-import os.path
+import importlib.resources
 
 import lsst.obs.base.yamlCamera as yamlCamera
 from lsst.utils.introspection import get_full_type_name
-from lsst.utils import getPackageDir
 from lsst.obs.base import Instrument, VisitSystem
 from .filters import (LSSTCAM_FILTER_DEFINITIONS, LATISS_FILTER_DEFINITIONS,
                       LSSTCAM_IMSIM_FILTER_DEFINITIONS, TS3_FILTER_DEFINITIONS,
@@ -44,8 +43,6 @@
 
 from .translators.lsst import GROUP_RE, TZERO_DATETIME
 
-PACKAGE_DIR = getPackageDir("obs_lsst")
-
 
 class LsstCam(Instrument):
     """Gen3 Butler specialization for the LSST Main Camera.
@@ -92,8 +89,8 @@ class LsstCam(Instrument):
 
     @property
     def configPaths(self):
-        return [os.path.join(PACKAGE_DIR, "config"),
-                os.path.join(PACKAGE_DIR, "config", self.policyName)]
+        return ["resource://lsst.obs.lsst/resources/config",
+                f"resource://lsst.obs.lsst/resources/config/{self.policyName}"]
 
     @classmethod
     def getName(cls):
@@ -104,8 +101,10 @@ def getName(cls):
     def getCamera(cls):
         # Constructing a YAML camera takes a long time but we rely on
         # yamlCamera to cache for us.
-        cameraYamlFile = os.path.join(PACKAGE_DIR, "policy", f"{cls.policyName}.yaml")
-        camera = yamlCamera.makeCamera(cameraYamlFile)
+        with importlib.resources.path(
+            "lsst.obs.lsst", f"resources/policy/{cls.policyName}.yaml"
+        ) as cameraYamlFile:
+            camera = yamlCamera.makeCamera(cameraYamlFile)
         if camera.getName() != cls.getName():
             raise RuntimeError(f"Expected to read camera geometry for {cls.instrument}"
                                f" but instead got geometry for {camera.getName()}")
diff --git a/python/lsst/obs/lsst/resources/config b/python/lsst/obs/lsst/resources/config
new file mode 120000
index 000000000..066f9511b
--- /dev/null
+++ b/python/lsst/obs/lsst/resources/config
@@ -0,0 +1 @@
+../../../../../config/
\ No newline at end of file
diff --git a/python/lsst/obs/lsst/resources/corrections b/python/lsst/obs/lsst/resources/corrections
new file mode 120000
index 000000000..efe58ab1f
--- /dev/null
+++ b/python/lsst/obs/lsst/resources/corrections
@@ -0,0 +1 @@
+../../../../../corrections/
\ No newline at end of file
diff --git a/python/lsst/obs/lsst/resources/policy/.gitignore b/python/lsst/obs/lsst/resources/policy/.gitignore
new file mode 100644
index 000000000..526f1b7bc
--- /dev/null
+++ b/python/lsst/obs/lsst/resources/policy/.gitignore
@@ -0,0 +1,10 @@
+/latiss.yaml
+/imsim.yaml
+/lsstCam.yaml
+/lsstCamSim.yaml
+/phosim.yaml
+/ts8.yaml
+/ucd.yaml
+/ts3.yaml
+/comCam.yaml
+/comCamSim.yaml
diff --git a/python/lsst/obs/lsst/script/generateCamera.py b/python/lsst/obs/lsst/script/generateCamera.py
index a3235134e..5269bb278 100644
--- a/python/lsst/obs/lsst/script/generateCamera.py
+++ b/python/lsst/obs/lsst/script/generateCamera.py
@@ -74,6 +74,7 @@ def build_argparser():
     parser.add_argument('outputFile', type=str, help="Name of generated file")
     parser.add_argument('--path', type=str, help="List of directories to search for components",
                         default=False)
+    parser.add_argument('--copy-to', type=str, help="Additional directory to write output to.", default="")
     parser.add_argument('--verbose', action="store_true", help="How chatty should I be?", default=False)
 
     return parser
@@ -318,6 +319,8 @@ def main():
 
     try:
         generateCamera(args.outputFile, args.path)
+        if args.copy_to:
+            shutil.copyfile(args.outputFile, os.path.join(args.copy_to, os.path.basename(args.outputFile)))
     except Exception as e:
         print(f"{e}", file=sys.stderr)
         return 1
diff --git a/python/lsst/obs/lsst/script/make_lsstcam_pseudoflats.py b/python/lsst/obs/lsst/script/make_lsstcam_pseudoflats.py
index cd5f20cec..91412d48b 100644
--- a/python/lsst/obs/lsst/script/make_lsstcam_pseudoflats.py
+++ b/python/lsst/obs/lsst/script/make_lsstcam_pseudoflats.py
@@ -7,7 +7,6 @@
 import argparse
 
 from lsst.daf.butler import Butler
-from lsst.pipe.base import Instrument
 from lsst.utils import getPackageDir
 import lsst.afw.cameraGeom
 from lsst.afw.image import ExposureF, FilterLabel
@@ -17,6 +16,7 @@
     VisualizeMosaicExpConfig,
     VisualizeMosaicExpTask,
 )
+from .._instrument import LsstCam
 
 
 def write_pseudoflats(butler: Butler | None, output_collection: str | None):
@@ -41,7 +41,7 @@ def write_pseudoflats(butler: Butler | None, output_collection: str | None):
         ],
     )
 
-    lsstcam_instr = Instrument.from_string("lsst.obs.lsst.LsstCam")
+    lsstcam_instr = LsstCam()
     camera = lsstcam_instr.getCamera()
 
     filter_dict = {
diff --git a/python/lsst/obs/lsst/testHelper.py b/python/lsst/obs/lsst/testHelper.py
index 9094ac9bf..b74761b24 100644
--- a/python/lsst/obs/lsst/testHelper.py
+++ b/python/lsst/obs/lsst/testHelper.py
@@ -30,10 +30,6 @@
 import lsst.utils.tests
 import lsst.obs.base.tests
 import lsst.daf.butler
-from lsst.utils import getPackageDir
-
-# Define the data location relative to this package
-DATAROOT = os.path.join(getPackageDir("obs_lsst"), "data", "input")
 
 
 class ObsLsstButlerTests(lsst.utils.tests.TestCase):
@@ -53,6 +49,8 @@ class ObsLsstButlerTests(lsst.utils.tests.TestCase):
 
     _butler = None
 
+    DATAROOT = "UNDEFINED"  # Define in subclass
+
     @classmethod
     @abstractmethod
     def getInstrument(cls):
@@ -71,7 +69,7 @@ def tearDownClass(cls):
 
     @classmethod
     def setUpClass(cls):
-        cls.data_dir = os.path.normpath(os.path.join(DATAROOT, cls.instrumentDir))
+        cls.data_dir = os.path.normpath(os.path.join(cls.DATAROOT, cls.instrumentDir))
         # Protection against the base class values being used
         if not os.path.exists(cls.data_dir):
             raise unittest.SkipTest(f"Data directory {cls.data_dir} does not exist.")
diff --git a/python/lsst/obs/lsst/translators/lsst.py b/python/lsst/obs/lsst/translators/lsst.py
index ce81313c2..bffde5231 100644
--- a/python/lsst/obs/lsst/translators/lsst.py
+++ b/python/lsst/obs/lsst/translators/lsst.py
@@ -14,7 +14,6 @@
            "compute_detector_exposure_id_generic", "LsstBaseTranslator",
            "SIMONYI_TELESCOPE")
 
-import os.path
 import yaml
 import logging
 import re
@@ -26,7 +25,7 @@
 from astropy.time import Time, TimeDelta
 from astropy.coordinates import EarthLocation
 
-from lsst.utils import getPackageDir
+from lsst.resources import ResourcePath, ResourcePathExpression
 
 from astro_metadata_translator import cache_translation, FitsTranslator
 from astro_metadata_translator.translators.helpers import tracking_from_degree_headers, \
@@ -69,20 +68,18 @@
 # Number of decimal digits used by exposure_ids.
 EXPOSURE_ID_MAXDIGITS = _SEQNUM_MAXDIGITS + _DAYOBS_MAXDIGITS
 
-obs_lsst_packageDir = getPackageDir("obs_lsst")
-
 log = logging.getLogger(__name__)
 
 
-def read_detector_ids(policyFile):
+def read_detector_ids(policyFile: ResourcePathExpression):
     """Read a camera policy file and retrieve the mapping from CCD name
     to ID.
 
     Parameters
     ----------
-    policyFile : `str`
-        Name of YAML policy file to read, relative to the obs_lsst
-        package.
+    policyFile : `lsst.resources.ResourcePathExpression`
+        Name of YAML policy file to read, relative to the resources root
+        directory. This usually means that the "policy" directory is included.
 
     Returns
     -------
@@ -99,14 +96,13 @@ def read_detector_ids(policyFile):
     `lsst.afw.cameraGeom`.  This is because the translators are intended to
     have minimal dependencies on LSST infrastructure.
     """
-
-    file = os.path.join(obs_lsst_packageDir, policyFile)
+    root = ResourcePath("resource://lsst.obs.lsst/resources/", forceDirectory=True)
+    resource = ResourcePath(policyFile, root=root)
     try:
-        with open(file) as fh:
-            # Use the fast parser since these files are large
-            camera = yaml.load(fh, Loader=yaml.CSafeLoader)
+        # Use the fast parser since these files are large
+        camera = yaml.load(resource.read(), Loader=yaml.CSafeLoader)
     except OSError as e:
-        raise ValueError(f"Could not load camera policy file {file}") from e
+        raise ValueError(f"Could not load camera policy file {resource}") from e
 
     mapping = {}
     for ccd, value in camera["CCDs"].items():
@@ -152,6 +148,8 @@ class LsstBaseTranslator(FitsTranslator):
 
     _const_map = {}
     _trivial_map = {}
+    default_resource_package = "lsst.obs.lsst"
+    default_resource_root = "resources/corrections/"
 
     # Do not specify a name for this translator
     cameraPolicyFile = None
@@ -203,18 +201,6 @@ def __init_subclass__(cls, **kwargs):
 
         super().__init_subclass__(**kwargs)
 
-    def search_paths(self):
-        """Search paths to use for LSST data when looking for header correction
-        files.
-
-        Returns
-        -------
-        path : `list`
-            List with a single element containing the full path to the
-            ``corrections`` directory within the ``obs_lsst`` package.
-        """
-        return [os.path.join(obs_lsst_packageDir, "corrections")]
-
     @classmethod
     def observing_date_to_offset(cls, observing_date: astropy.time.Time) -> astropy.time.TimeDelta | None:
         """Return the offset to use when calculating the observing day.
diff --git a/data/input/lsstCam/LSSTCam/calib/unbounded/camera/camera_LSSTCam_LSSTCam_calib_unbounded.fits b/tests/data/input/bot/LSSTCam/calib/unbounded/camera/camera_LSSTCam_LSSTCam_calib_unbounded.fits
similarity index 100%
rename from data/input/lsstCam/LSSTCam/calib/unbounded/camera/camera_LSSTCam_LSSTCam_calib_unbounded.fits
rename to tests/data/input/bot/LSSTCam/calib/unbounded/camera/camera_LSSTCam_LSSTCam_calib_unbounded.fits
diff --git a/data/input/comCam/butler.yaml b/tests/data/input/bot/butler.yaml
similarity index 100%
rename from data/input/comCam/butler.yaml
rename to tests/data/input/bot/butler.yaml
diff --git a/tests/data/input/gen3.sqlite3 b/tests/data/input/bot/gen3.sqlite3
similarity index 100%
rename from tests/data/input/gen3.sqlite3
rename to tests/data/input/bot/gen3.sqlite3
diff --git a/tests/data/input/bot/raw/2019-10-31/3019103101985/3019103101985-R22-S11-det094.fits b/tests/data/input/bot/raw/2019-10-31/3019103101985/3019103101985-R22-S11-det094.fits
new file mode 120000
index 000000000..78aeb7d13
--- /dev/null
+++ b/tests/data/input/bot/raw/2019-10-31/3019103101985/3019103101985-R22-S11-det094.fits
@@ -0,0 +1 @@
+../../../../../e2v_spot.fits.gz
\ No newline at end of file
diff --git a/tests/data/input/bot/raw/2019-11-01/3019110102212/3019110102212-R02-S02-det011.fits b/tests/data/input/bot/raw/2019-11-01/3019110102212/3019110102212-R02-S02-det011.fits
new file mode 120000
index 000000000..2d8ea6449
--- /dev/null
+++ b/tests/data/input/bot/raw/2019-11-01/3019110102212/3019110102212-R02-S02-det011.fits
@@ -0,0 +1 @@
+../../../../../itl_spot.fits.gz
\ No newline at end of file
diff --git a/data/input/comCam/LSSTComCam/calib/unbounded/camera/camera_LSSTComCam_LSSTComCam_calib_unbounded.fits b/tests/data/input/comCam/LSSTComCam/calib/unbounded/camera/camera_LSSTComCam_LSSTComCam_calib_unbounded.fits
similarity index 100%
rename from data/input/comCam/LSSTComCam/calib/unbounded/camera/camera_LSSTComCam_LSSTComCam_calib_unbounded.fits
rename to tests/data/input/comCam/LSSTComCam/calib/unbounded/camera/camera_LSSTComCam_LSSTComCam_calib_unbounded.fits
diff --git a/data/input/comCamSim/butler.yaml b/tests/data/input/comCam/butler.yaml
similarity index 100%
rename from data/input/comCamSim/butler.yaml
rename to tests/data/input/comCam/butler.yaml
diff --git a/data/input/comCam/gen3.sqlite3 b/tests/data/input/comCam/gen3.sqlite3
similarity index 100%
rename from data/input/comCam/gen3.sqlite3
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diff --git a/data/input/comCam/raw/2019-05-30/3019053000001/3019053000001-R22-S00-det000.fits b/tests/data/input/comCam/raw/2019-05-30/3019053000001/3019053000001-R22-S00-det000.fits
similarity index 100%
rename from data/input/comCam/raw/2019-05-30/3019053000001/3019053000001-R22-S00-det000.fits
rename to tests/data/input/comCam/raw/2019-05-30/3019053000001/3019053000001-R22-S00-det000.fits
diff --git a/data/input/comCamSim/LSSTComCamSim/calib/unbounded/camera/camera_LSSTComCamSim_LSSTComCamSim_calib_unbounded.fits b/tests/data/input/comCamSim/LSSTComCamSim/calib/unbounded/camera/camera_LSSTComCamSim_LSSTComCamSim_calib_unbounded.fits
similarity index 100%
rename from data/input/comCamSim/LSSTComCamSim/calib/unbounded/camera/camera_LSSTComCamSim_LSSTComCamSim_calib_unbounded.fits
rename to tests/data/input/comCamSim/LSSTComCamSim/calib/unbounded/camera/camera_LSSTComCamSim_LSSTComCamSim_calib_unbounded.fits
diff --git a/data/input/imsim/butler.yaml b/tests/data/input/comCamSim/butler.yaml
similarity index 100%
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diff --git a/data/input/comCamSim/gen3.sqlite3 b/tests/data/input/comCamSim/gen3.sqlite3
similarity index 100%
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diff --git a/data/input/comCamSim/raw/2024-03-21/7024032100720/7024032100720-R22-S11-det004.fits.fz b/tests/data/input/comCamSim/raw/2024-03-21/7024032100720/7024032100720-R22-S11-det004.fits.fz
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diff --git a/data/input/comCamSim/raw/2024-04-04/7024040400780/CC_S_20240404_000780_R22_S01.fits b/tests/data/input/comCamSim/raw/2024-04-04/7024040400780/CC_S_20240404_000780_R22_S01.fits
similarity index 100%
rename from data/input/comCamSim/raw/2024-04-04/7024040400780/CC_S_20240404_000780_R22_S01.fits
rename to tests/data/input/comCamSim/raw/2024-04-04/7024040400780/CC_S_20240404_000780_R22_S01.fits
diff --git a/data/input/guider/guider_data/MC_C_20230616_000013_R04_SG0.fits b/tests/data/input/guider/guider_data/MC_C_20230616_000013_R04_SG0.fits
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diff --git a/data/input/guider/guider_data/MC_C_20240918_000013_R00_SG0_guider.fits b/tests/data/input/guider/guider_data/MC_C_20240918_000013_R00_SG0_guider.fits
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diff --git a/data/input/guider/guider_data/MC_C_20240918_000013_R00_SG0_guider.json b/tests/data/input/guider/guider_data/MC_C_20240918_000013_R00_SG0_guider.json
similarity index 100%
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diff --git a/data/input/guider/raw/MC_C_20240918_000013_R42_S11.fits b/tests/data/input/guider/raw/MC_C_20240918_000013_R42_S11.fits
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diff --git a/data/input/guider/raw/MC_C_20240918_000013_R42_S11.json b/tests/data/input/guider/raw/MC_C_20240918_000013_R42_S11.json
similarity index 100%
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diff --git a/data/input/imsim/CALIB/bias/2022-01-01/bias-R11-S20-det042_2022-01-01.fits b/tests/data/input/imsim/CALIB/bias/2022-01-01/bias-R11-S20-det042_2022-01-01.fits
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diff --git a/data/input/imsim/CALIB/dark/2022-01-01/dark-R11-S20-det042_2022-01-01.fits b/tests/data/input/imsim/CALIB/dark/2022-01-01/dark-R11-S20-det042_2022-01-01.fits
similarity index 100%
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rename to tests/data/input/imsim/CALIB/dark/2022-01-01/dark-R11-S20-det042_2022-01-01.fits
diff --git a/data/input/imsim/CALIB/flat/i_sim_1.4/2022-08-06/flat_i_sim_1.4-R11-S20-det042_2022-08-06.fits b/tests/data/input/imsim/CALIB/flat/i_sim_1.4/2022-08-06/flat_i_sim_1.4-R11-S20-det042_2022-08-06.fits
similarity index 100%
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rename to tests/data/input/imsim/CALIB/flat/i_sim_1.4/2022-08-06/flat_i_sim_1.4-R11-S20-det042_2022-08-06.fits
diff --git a/data/input/imsim/LSSTCam-imSim/calib/unbounded/camera/camera_LSSTCam-imSim_LSSTCam-imSim_calib_unbounded.fits b/tests/data/input/imsim/LSSTCam-imSim/calib/unbounded/camera/camera_LSSTCam-imSim_LSSTCam-imSim_calib_unbounded.fits
similarity index 100%
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rename to tests/data/input/imsim/LSSTCam-imSim/calib/unbounded/camera/camera_LSSTCam-imSim_LSSTCam-imSim_calib_unbounded.fits
diff --git a/data/input/latiss/butler.yaml b/tests/data/input/imsim/butler.yaml
similarity index 100%
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diff --git a/data/input/imsim/gen3.sqlite3 b/tests/data/input/imsim/gen3.sqlite3
similarity index 100%
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diff --git a/data/input/imsim/raw/204595/R11/00204595-R11-S20-det042.fits b/tests/data/input/imsim/raw/204595/R11/00204595-R11-S20-det042.fits
similarity index 100%
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diff --git a/data/input/latiss/CALIB/bias/2018-09-21/bias-det000_2018-09-21.fits b/tests/data/input/latiss/CALIB/bias/2018-09-21/bias-det000_2018-09-21.fits
similarity index 100%
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diff --git a/data/input/latiss/LATISS/calib/unbounded/camera/camera_LATISS_LATISS_calib_unbounded.fits b/tests/data/input/latiss/LATISS/calib/unbounded/camera/camera_LATISS_LATISS_calib_unbounded.fits
similarity index 100%
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rename to tests/data/input/latiss/LATISS/calib/unbounded/camera/camera_LATISS_LATISS_calib_unbounded.fits
diff --git a/data/input/lsstCam/butler.yaml b/tests/data/input/latiss/butler.yaml
similarity index 100%
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diff --git a/data/input/latiss/gen3.sqlite3 b/tests/data/input/latiss/gen3.sqlite3
similarity index 100%
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diff --git a/data/input/latiss/raw/2018-09-20/3018092000065-det000.fits b/tests/data/input/latiss/raw/2018-09-20/3018092000065-det000.fits
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diff --git a/tests/data/input/LSSTCam/calib/unbounded/camera/camera_LSSTCam_LSSTCam_calib_unbounded.fits b/tests/data/input/lsstCam/LSSTCam/calib/unbounded/camera/camera_LSSTCam_LSSTCam_calib_unbounded.fits
similarity index 100%
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diff --git a/data/input/lsstCamSim/butler.yaml b/tests/data/input/lsstCam/butler.yaml
similarity index 100%
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diff --git a/data/input/lsstCam/eimage/4000021706001/E000/R22/eimage_4000021706001_R22_S00_E000.fits.gz b/tests/data/input/lsstCam/eimage/4000021706001/E000/R22/eimage_4000021706001_R22_S00_E000.fits.gz
similarity index 100%
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diff --git a/data/input/lsstCam/gen3.sqlite3 b/tests/data/input/lsstCam/gen3.sqlite3
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diff --git a/data/input/lsstCam/raw/2019-03-19/3019031900001/3019031900001-R10-S02-det029.fits b/tests/data/input/lsstCam/raw/2019-03-19/3019031900001/3019031900001-R10-S02-det029.fits
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diff --git a/data/input/lsstCam/raw/2019-03-19/3019031900001/3019031900001-R22-S21-det097.fits b/tests/data/input/lsstCam/raw/2019-03-19/3019031900001/3019031900001-R22-S21-det097.fits
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diff --git a/data/input/lsstCam/raw/2019-03-22/3019032200002/3019032200002-R10-S22-det035.fits b/tests/data/input/lsstCam/raw/2019-03-22/3019032200002/3019032200002-R10-S22-det035.fits
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diff --git a/data/input/lsstCam/raw/2021-12-12/30211212000310/30211212000310-R22-S22-det098.fits b/tests/data/input/lsstCam/raw/2021-12-12/30211212000310/30211212000310-R22-S22-det098.fits
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diff --git a/data/input/lsstCam/raw/2021-12-12/30211212000310/MC_O_30211212_000310_shutterMotionProfileClose.json b/tests/data/input/lsstCam/raw/2021-12-12/30211212000310/MC_O_30211212_000310_shutterMotionProfileClose.json
similarity index 100%
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rename to tests/data/input/lsstCam/raw/2021-12-12/30211212000310/MC_O_30211212_000310_shutterMotionProfileClose.json
diff --git a/data/input/lsstCam/raw/2021-12-12/30211212000310/MC_O_30211212_000310_shutterMotionProfileOpen.json b/tests/data/input/lsstCam/raw/2021-12-12/30211212000310/MC_O_30211212_000310_shutterMotionProfileOpen.json
similarity index 100%
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rename to tests/data/input/lsstCam/raw/2021-12-12/30211212000310/MC_O_30211212_000310_shutterMotionProfileOpen.json
diff --git a/data/input/lsstCam/raw/2021-12-12/30211212000310/Photodiode_Readings_20211212_000310.txt b/tests/data/input/lsstCam/raw/2021-12-12/30211212000310/Photodiode_Readings_20211212_000310.txt
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rename to tests/data/input/lsstCam/raw/2021-12-12/30211212000310/Photodiode_Readings_20211212_000310.txt
diff --git a/data/input/lsstCamSim/LSSTCamSim/calib/unbounded/camera/camera_LSSTCamSim_LSSTCamSim_calib_unbounded.fits b/tests/data/input/lsstCamSim/LSSTCamSim/calib/unbounded/camera/camera_LSSTCamSim_LSSTCamSim_calib_unbounded.fits
similarity index 100%
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rename to tests/data/input/lsstCamSim/LSSTCamSim/calib/unbounded/camera/camera_LSSTCamSim_LSSTCamSim_calib_unbounded.fits
diff --git a/data/input/phosim/butler.yaml b/tests/data/input/lsstCamSim/butler.yaml
similarity index 100%
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rename to tests/data/input/lsstCamSim/butler.yaml
diff --git a/data/input/lsstCamSim/gen3.sqlite3 b/tests/data/input/lsstCamSim/gen3.sqlite3
similarity index 100%
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diff --git a/data/input/lsstCamSim/raw/2024-03-21/7024032100720/7024032100720-R22-S11-det094.fits.fz b/tests/data/input/lsstCamSim/raw/2024-03-21/7024032100720/7024032100720-R22-S11-det094.fits.fz
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diff --git a/data/input/phosim/LSSTCam-PhoSim/calib/unbounded/camera/camera_LSSTCam-PhoSim_LSSTCam-PhoSim_calib_unbounded.fits b/tests/data/input/phosim/LSSTCam-PhoSim/calib/unbounded/camera/camera_LSSTCam-PhoSim_LSSTCam-PhoSim_calib_unbounded.fits
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rename to tests/data/input/phosim/LSSTCam-PhoSim/calib/unbounded/camera/camera_LSSTCam-PhoSim_LSSTCam-PhoSim_calib_unbounded.fits
diff --git a/data/input/ts3/butler.yaml b/tests/data/input/phosim/butler.yaml
similarity index 100%
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rename to tests/data/input/phosim/butler.yaml
diff --git a/data/input/phosim/eimage/9006002/E000/R22/eimage_09006002_R22_S00_E000.fits.gz b/tests/data/input/phosim/eimage/9006002/E000/R22/eimage_09006002_R22_S00_E000.fits.gz
similarity index 100%
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diff --git a/data/input/phosim/gen3.sqlite3 b/tests/data/input/phosim/gen3.sqlite3
similarity index 100%
rename from data/input/phosim/gen3.sqlite3
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diff --git a/data/input/phosim/processCcd_metadata/00204595-i/R11/processCcdMetadata_00204595-i-R11-S11-det040.yaml b/tests/data/input/phosim/processCcd_metadata/00204595-i/R11/processCcdMetadata_00204595-i-R11-S11-det040.yaml
similarity index 100%
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rename to tests/data/input/phosim/processCcd_metadata/00204595-i/R11/processCcdMetadata_00204595-i-R11-S11-det040.yaml
diff --git a/data/input/phosim/raw/204595/R11/00204595-R11-S20-det042.fits b/tests/data/input/phosim/raw/204595/R11/00204595-R11-S20-det042.fits
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diff --git a/tests/data/input/raw/2019-10-31/3019103101985/3019103101985-R22-S11-det094.fits b/tests/data/input/raw/2019-10-31/3019103101985/3019103101985-R22-S11-det094.fits
deleted file mode 120000
index 106e3a359..000000000
--- a/tests/data/input/raw/2019-10-31/3019103101985/3019103101985-R22-S11-det094.fits
+++ /dev/null
@@ -1 +0,0 @@
-../../../../e2v_spot.fits.gz
\ No newline at end of file
diff --git a/tests/data/input/raw/2019-11-01/3019110102212/3019110102212-R02-S02-det011.fits b/tests/data/input/raw/2019-11-01/3019110102212/3019110102212-R02-S02-det011.fits
deleted file mode 120000
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--- a/tests/data/input/raw/2019-11-01/3019110102212/3019110102212-R02-S02-det011.fits
+++ /dev/null
@@ -1 +0,0 @@
-../../../../itl_spot.fits.gz
\ No newline at end of file
diff --git a/data/input/ts3/LSST-TS3/calib/unbounded/camera/camera_LSST-TS3_LSST-TS3_calib_unbounded.fits b/tests/data/input/ts3/LSST-TS3/calib/unbounded/camera/camera_LSST-TS3_LSST-TS3_calib_unbounded.fits
similarity index 100%
rename from data/input/ts3/LSST-TS3/calib/unbounded/camera/camera_LSST-TS3_LSST-TS3_calib_unbounded.fits
rename to tests/data/input/ts3/LSST-TS3/calib/unbounded/camera/camera_LSST-TS3_LSST-TS3_calib_unbounded.fits
diff --git a/data/input/ts8/butler.yaml b/tests/data/input/ts3/butler.yaml
similarity index 100%
rename from data/input/ts8/butler.yaml
rename to tests/data/input/ts3/butler.yaml
diff --git a/data/input/ts3/gen3.sqlite3 b/tests/data/input/ts3/gen3.sqlite3
similarity index 100%
rename from data/input/ts3/gen3.sqlite3
rename to tests/data/input/ts3/gen3.sqlite3
diff --git a/data/input/ts3/raw/2016-07-22/201607220607067-R071-S00-det071.fits b/tests/data/input/ts3/raw/2016-07-22/201607220607067-R071-S00-det071.fits
similarity index 100%
rename from data/input/ts3/raw/2016-07-22/201607220607067-R071-S00-det071.fits
rename to tests/data/input/ts3/raw/2016-07-22/201607220607067-R071-S00-det071.fits
diff --git a/data/input/ts3/raw/2018-11-15/201811151255111-R433-S00-det433.fits b/tests/data/input/ts3/raw/2018-11-15/201811151255111-R433-S00-det433.fits
similarity index 100%
rename from data/input/ts3/raw/2018-11-15/201811151255111-R433-S00-det433.fits
rename to tests/data/input/ts3/raw/2018-11-15/201811151255111-R433-S00-det433.fits
diff --git a/data/input/ts8/CALIB/bias/2018-07-24/bias-RTM-010-S11-det067_2018-07-24.fits b/tests/data/input/ts8/CALIB/bias/2018-07-24/bias-RTM-010-S11-det067_2018-07-24.fits
similarity index 100%
rename from data/input/ts8/CALIB/bias/2018-07-24/bias-RTM-010-S11-det067_2018-07-24.fits
rename to tests/data/input/ts8/CALIB/bias/2018-07-24/bias-RTM-010-S11-det067_2018-07-24.fits
diff --git a/data/input/ts8/LSST-TS8/calib/unbounded/camera/camera_LSST-TS8_LSST-TS8_calib_unbounded.fits b/tests/data/input/ts8/LSST-TS8/calib/unbounded/camera/camera_LSST-TS8_LSST-TS8_calib_unbounded.fits
similarity index 100%
rename from data/input/ts8/LSST-TS8/calib/unbounded/camera/camera_LSST-TS8_LSST-TS8_calib_unbounded.fits
rename to tests/data/input/ts8/LSST-TS8/calib/unbounded/camera/camera_LSST-TS8_LSST-TS8_calib_unbounded.fits
diff --git a/data/input/ucd/butler.yaml b/tests/data/input/ts8/butler.yaml
similarity index 100%
rename from data/input/ucd/butler.yaml
rename to tests/data/input/ts8/butler.yaml
diff --git a/data/input/ts8/gen3.sqlite3 b/tests/data/input/ts8/gen3.sqlite3
similarity index 100%
rename from data/input/ts8/gen3.sqlite3
rename to tests/data/input/ts8/gen3.sqlite3
diff --git a/data/input/ts8/raw/6006D/201807241028453-RTM-010-S11-det067.fits b/tests/data/input/ts8/raw/6006D/201807241028453-RTM-010-S11-det067.fits
similarity index 100%
rename from data/input/ts8/raw/6006D/201807241028453-RTM-010-S11-det067.fits
rename to tests/data/input/ts8/raw/6006D/201807241028453-RTM-010-S11-det067.fits
diff --git a/data/input/ucd/LSST-UCDCam/calib/unbounded/camera/camera_LSST-UCDCam_LSST-UCDCam_calib_unbounded.fits b/tests/data/input/ucd/LSST-UCDCam/calib/unbounded/camera/camera_LSST-UCDCam_LSST-UCDCam_calib_unbounded.fits
similarity index 100%
rename from data/input/ucd/LSST-UCDCam/calib/unbounded/camera/camera_LSST-UCDCam_LSST-UCDCam_calib_unbounded.fits
rename to tests/data/input/ucd/LSST-UCDCam/calib/unbounded/camera/camera_LSST-UCDCam_LSST-UCDCam_calib_unbounded.fits
diff --git a/tests/data/input/butler.yaml b/tests/data/input/ucd/butler.yaml
similarity index 100%
rename from tests/data/input/butler.yaml
rename to tests/data/input/ucd/butler.yaml
diff --git a/data/input/ucd/gen3.sqlite3 b/tests/data/input/ucd/gen3.sqlite3
similarity index 100%
rename from data/input/ucd/gen3.sqlite3
rename to tests/data/input/ucd/gen3.sqlite3
diff --git a/data/input/ucd/raw/2023-07-30/3023073000237-R22-S01-det001.fits b/tests/data/input/ucd/raw/2023-07-30/3023073000237-R22-S01-det001.fits
similarity index 100%
rename from data/input/ucd/raw/2023-07-30/3023073000237-R22-S01-det001.fits
rename to tests/data/input/ucd/raw/2023-07-30/3023073000237-R22-S01-det001.fits
diff --git a/data/input/ucd/raw/2023-10-31/2023103100227-R21-S01-det010.fits b/tests/data/input/ucd/raw/2023-10-31/2023103100227-R21-S01-det010.fits
similarity index 100%
rename from data/input/ucd/raw/2023-10-31/2023103100227-R21-S01-det010.fits
rename to tests/data/input/ucd/raw/2023-10-31/2023103100227-R21-S01-det010.fits
diff --git a/tests/test_assemble.py b/tests/test_assemble.py
index 527658f33..5ab30677d 100644
--- a/tests/test_assemble.py
+++ b/tests/test_assemble.py
@@ -25,19 +25,18 @@
 import unittest
 
 import lsst.utils.tests
-from lsst.utils import getPackageDir
 from lsst.daf.butler import Butler
 from lsst.afw.cameraGeom import Detector
 from lsst.afw.image import ImageFitsReader
 import lsst.obs.base.yamlCamera as yamlCamera
 from lsst.ip.isr import AssembleCcdTask
+from lsst.resources import ResourcePath
 
 from lsst.obs.lsst.utils import readRawFile
 
-PACKAGE_DIR = getPackageDir("obs_lsst")
 TESTDIR = os.path.dirname(__file__)
-LATISS_DATA_ROOT = os.path.join(PACKAGE_DIR, 'data', 'input', 'latiss')
-BOT_DATA_ROOT = os.path.join(TESTDIR, 'data', 'input')
+LATISS_DATA_ROOT = os.path.join(TESTDIR, 'data', 'input', 'latiss')
+BOT_DATA_ROOT = os.path.join(TESTDIR, 'data', 'input', 'bot')
 E2V_DATA_ID = {'raft': 'R22', 'name_in_raft': 'S11', 'exposure': 3019103101985, 'instrument': 'LSSTCam'}
 ITL_DATA_ID = {'raft': 'R02', 'name_in_raft': 'S02', 'exposure': 3019110102212, 'instrument': 'LSSTCam'}
 TESTDATA_ROOT = os.path.join(TESTDIR, "data")
@@ -146,8 +145,10 @@ def testAssemble(self):
 class ReadRawFileTestCase(lsst.utils.tests.TestCase):
     def testReadRawLatissFile(self):
         fileName = os.path.join(LATISS_DATA_ROOT, "raw/2018-09-20/3018092000065-det000.fits")
-        policy = os.path.join(PACKAGE_DIR, "policy", "latiss.yaml")
-        camera = yamlCamera.makeCamera(policy)
+        with ResourcePath(
+            "resource://lsst.obs.lsst/resources/policy/latiss.yaml", forceDirectory=False
+        ).as_local() as policy_file:
+            camera = yamlCamera.makeCamera(policy_file.ospath)
         exposure = readRawFile(fileName, camera[0], dataId={"file": fileName})
         self.assertIsInstance(exposure, lsst.afw.image.Exposure)
         md = exposure.getMetadata()
diff --git a/tests/test_comCam.py b/tests/test_comCam.py
index df0bc4939..4b8e0a94f 100644
--- a/tests/test_comCam.py
+++ b/tests/test_comCam.py
@@ -19,6 +19,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
+import os.path
 import sys
 import unittest
 
@@ -29,9 +30,12 @@
 from lsst.obs.lsst.testHelper import ObsLsstButlerTests, ObsLsstObsBaseOverrides
 from lsst.obs.lsst import LsstComCam
 
+TESTDIR = os.path.abspath(os.path.dirname(__file__))
+
 
 class TestLsstCam(ObsLsstObsBaseOverrides, ObsLsstButlerTests):
     instrumentDir = "comCam"
+    DATAROOT = os.path.join(TESTDIR, "data", "input")
 
     @classmethod
     def getInstrument(cls):
diff --git a/tests/test_comCamSim.py b/tests/test_comCamSim.py
index e52d56c50..6ea5e396d 100644
--- a/tests/test_comCamSim.py
+++ b/tests/test_comCamSim.py
@@ -19,6 +19,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
+import os.path
 import sys
 import unittest
 
@@ -29,9 +30,12 @@
 from lsst.obs.lsst.testHelper import ObsLsstButlerTests, ObsLsstObsBaseOverrides
 from lsst.obs.lsst import LsstComCamSim
 
+TESTDIR = os.path.abspath(os.path.dirname(__file__))
+
 
 class TestLsstCam(ObsLsstObsBaseOverrides, ObsLsstButlerTests):
     instrumentDir = "comCamSim"
+    DATAROOT = os.path.join(TESTDIR, "data", "input")
 
     @classmethod
     def getInstrument(cls):
diff --git a/tests/test_gen3.py b/tests/test_gen3.py
index 9f377d09f..37a1f7141 100644
--- a/tests/test_gen3.py
+++ b/tests/test_gen3.py
@@ -40,7 +40,7 @@
 )
 
 TESTDIR = os.path.abspath(os.path.dirname(__file__))
-DATAROOT = os.path.join(TESTDIR, os.path.pardir, "data", "input")
+DATAROOT = os.path.join(TESTDIR, "data", "input")
 
 # This test is unfortunately slow; leave a profiling option in in case we want
 # to improve it later.  Initial version is about 60% YamlCamera construction
diff --git a/tests/test_generateCamera.py b/tests/test_generateCamera.py
index 484fcf2c7..7d0f86598 100644
--- a/tests/test_generateCamera.py
+++ b/tests/test_generateCamera.py
@@ -26,16 +26,13 @@
 import shutil
 from tempfile import mkdtemp
 
-import lsst.utils
-import lsst.utils.tests
-
 from lsst.obs.lsst.script.generateCamera import generateCamera, parseYamlOnPath
 
 TESTDIR = os.path.abspath(os.path.dirname(__file__))
 POLICYDIR = os.path.normpath(os.path.join(TESTDIR, os.path.pardir, 'policy'))
 
 
-class PhosimToRaftsTestCase(lsst.utils.tests.ExecutablesTestCase):
+class PhosimToRaftsTestCase(unittest.TestCase):
     """Test the generateCamera.py utility script."""
 
     def setUp(self):
@@ -111,5 +108,4 @@ def testFailures(self):
 
 
 if __name__ == "__main__":
-    lsst.utils.tests.init()
     unittest.main()
diff --git a/tests/test_guider.py b/tests/test_guider.py
index 2d065e80d..38fc96e31 100644
--- a/tests/test_guider.py
+++ b/tests/test_guider.py
@@ -30,7 +30,7 @@
 from lsst.obs.base import RawIngestTask
 
 TESTDIR = os.path.abspath(os.path.dirname(__file__))
-DATAROOT = os.path.join(TESTDIR, os.path.pardir, "data", "input", "guider")
+DATAROOT = os.path.join(TESTDIR, "data", "input", "guider")
 
 
 class GuiderIngestTestCase(unittest.TestCase):
diff --git a/tests/test_imsim.py b/tests/test_imsim.py
index 1bf2d6dac..00680f7e9 100644
--- a/tests/test_imsim.py
+++ b/tests/test_imsim.py
@@ -19,6 +19,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
+import os.path
 import sys
 import unittest
 
@@ -29,9 +30,12 @@
 from lsst.obs.lsst.testHelper import ObsLsstButlerTests, ObsLsstObsBaseOverrides
 from lsst.obs.lsst import LsstCamImSim
 
+TESTDIR = os.path.abspath(os.path.dirname(__file__))
+
 
 class TestImsim(ObsLsstObsBaseOverrides, ObsLsstButlerTests):
     instrumentDir = "imsim"
+    DATAROOT = os.path.join(TESTDIR, "data", "input")
 
     @classmethod
     def getInstrument(cls):
diff --git a/tests/test_ingest.py b/tests/test_ingest.py
index fa2c00e05..ad8eb124d 100644
--- a/tests/test_ingest.py
+++ b/tests/test_ingest.py
@@ -38,7 +38,7 @@
 import lsst.obs.lsst
 
 TESTDIR = os.path.abspath(os.path.dirname(__file__))
-DATAROOT = os.path.join(TESTDIR, os.path.pardir, "data", "input")
+DATAROOT = os.path.join(TESTDIR, "data", "input")
 
 
 class LatissIngestTestCase(IngestTestBase, lsst.utils.tests.TestCase):
diff --git a/tests/test_latiss.py b/tests/test_latiss.py
index 7e18abda3..01e6ff777 100644
--- a/tests/test_latiss.py
+++ b/tests/test_latiss.py
@@ -19,6 +19,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
+import os.path
 import sys
 import unittest
 
@@ -29,9 +30,12 @@
 from lsst.obs.lsst.testHelper import ObsLsstButlerTests, ObsLsstObsBaseOverrides
 from lsst.obs.lsst import Latiss
 
+TESTDIR = os.path.abspath(os.path.dirname(__file__))
+
 
 class TestLatiss(ObsLsstObsBaseOverrides, ObsLsstButlerTests):
     instrumentDir = "latiss"
+    DATAROOT = os.path.join(TESTDIR, "data", "input")
 
     @classmethod
     def getInstrument(cls):
diff --git a/tests/test_lsstCam.py b/tests/test_lsstCam.py
index c31f37e44..e80bfe0cb 100644
--- a/tests/test_lsstCam.py
+++ b/tests/test_lsstCam.py
@@ -19,6 +19,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
+import os.path
 import sys
 import unittest
 
@@ -29,9 +30,12 @@
 from lsst.obs.lsst.testHelper import ObsLsstButlerTests, ObsLsstObsBaseOverrides
 from lsst.obs.lsst import LsstCam
 
+TESTDIR = os.path.abspath(os.path.dirname(__file__))
+
 
 class TestLsstCam(ObsLsstObsBaseOverrides, ObsLsstButlerTests):
     instrumentDir = "lsstCam"
+    DATAROOT = os.path.join(TESTDIR, "data", "input")
 
     @classmethod
     def getInstrument(cls):
diff --git a/tests/test_lsstCamSim.py b/tests/test_lsstCamSim.py
index 0baacd225..bff186534 100644
--- a/tests/test_lsstCamSim.py
+++ b/tests/test_lsstCamSim.py
@@ -19,6 +19,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
+import os.path
 import sys
 import unittest
 
@@ -29,9 +30,12 @@
 from lsst.obs.lsst.testHelper import ObsLsstButlerTests, ObsLsstObsBaseOverrides
 from lsst.obs.lsst import LsstCamSim
 
+TESTDIR = os.path.abspath(os.path.dirname(__file__))
+
 
 class TestLsstCamSim(ObsLsstObsBaseOverrides, ObsLsstButlerTests):
     instrumentDir = "lsstCamSim"
+    DATAROOT = os.path.join(TESTDIR, "data", "input")
 
     @classmethod
     def getInstrument(cls):
diff --git a/tests/test_phosim.py b/tests/test_phosim.py
index 0ce0d5dc9..ae32d3bcf 100644
--- a/tests/test_phosim.py
+++ b/tests/test_phosim.py
@@ -43,6 +43,7 @@ def _clean_metadata_provenance(hdr):
 
 class TestPhosim(ObsLsstObsBaseOverrides, ObsLsstButlerTests):
     instrumentDir = "phosim"
+    DATAROOT = os.path.join(TESTDIR, "data", "input")
 
     @classmethod
     def getInstrument(cls):
diff --git a/tests/test_rewrite_qe.py b/tests/test_rewrite_qe.py
index 301623ddf..405d14d99 100644
--- a/tests/test_rewrite_qe.py
+++ b/tests/test_rewrite_qe.py
@@ -27,15 +27,14 @@
 import tempfile
 import glob
 
-import lsst.utils
 from lsst.obs.lsst.script.rewrite_ts8_qe_files import rewrite_ts8_files
 from lsst.ip.isr import IntermediateSensorTransmissionCurve
+from lsst.resources import ResourcePath
 
 TESTDIR = os.path.abspath(os.path.dirname(__file__))
-DATADIR = lsst.utils.getPackageDir('obs_lsst_data')
 
 
-class RewriteQeTestCase(lsst.utils.tests.ExecutablesTestCase):
+class RewriteQeTestCase(unittest.TestCase):
     """Test the rewrite_ts8_qe_files.py utility script."""
 
     def testRewriteQe(self):
@@ -48,8 +47,13 @@ def testRewriteQe(self):
             self.assertEqual(len(files), 9)
             for f in files:
                 curve1 = IntermediateSensorTransmissionCurve.readText(f)
-                expect_file = os.path.join(DATADIR, 'ts8', 'transmission_sensor', os.path.relpath(f, root))
-                curve2 = IntermediateSensorTransmissionCurve.readText(expect_file)
+
+                rel_path = os.path.relpath(f, root)
+                with ResourcePath(
+                    f"resource://lsst.obs_lsst_data/resources/ts8/transmission_sensor/{rel_path}",
+                    forceDirectory=False,
+                ).as_local() as expect_file:
+                    curve2 = IntermediateSensorTransmissionCurve.readText(expect_file.ospath)
 
                 # These fields are created every time, and therefore
                 # differ between the test data and the references.
diff --git a/tests/test_ts3.py b/tests/test_ts3.py
index 3f38959d3..ba2efcdcd 100644
--- a/tests/test_ts3.py
+++ b/tests/test_ts3.py
@@ -19,6 +19,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
+import os.path
 import sys
 import unittest
 
@@ -29,9 +30,12 @@
 from lsst.obs.lsst.testHelper import ObsLsstButlerTests, ObsLsstObsBaseOverrides
 from lsst.obs.lsst import LsstTS3
 
+TESTDIR = os.path.abspath(os.path.dirname(__file__))
+
 
 class TestTs3(ObsLsstObsBaseOverrides, ObsLsstButlerTests):
     instrumentDir = "ts3"
+    DATAROOT = os.path.join(TESTDIR, "data", "input")
 
     @classmethod
     def getInstrument(cls):
diff --git a/tests/test_ts8.py b/tests/test_ts8.py
index dfe4894d2..5055383c1 100644
--- a/tests/test_ts8.py
+++ b/tests/test_ts8.py
@@ -19,6 +19,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
+import os.path
 import sys
 import unittest
 
@@ -29,9 +30,12 @@
 from lsst.obs.lsst.testHelper import ObsLsstButlerTests, ObsLsstObsBaseOverrides
 from lsst.obs.lsst import LsstTS8
 
+TESTDIR = os.path.abspath(os.path.dirname(__file__))
+
 
 class TestTs8(ObsLsstObsBaseOverrides, ObsLsstButlerTests):
     instrumentDir = "ts8"
+    DATAROOT = os.path.join(TESTDIR, "data", "input")
 
     @classmethod
     def getInstrument(cls):
diff --git a/tests/test_ucdcam.py.old b/tests/test_ucdcam.py.old
index 5de3eef5a..1bef2dfc9 100644
--- a/tests/test_ucdcam.py.old
+++ b/tests/test_ucdcam.py.old
@@ -19,6 +19,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
+import os.path
 import sys
 import unittest
 
@@ -29,9 +30,12 @@ import lsst.afw.image
 from lsst.obs.lsst.testHelper import ObsLsstButlerTests, ObsLsstObsBaseOverrides
 from lsst.obs.lsst import LsstUCDCam
 
+TESTDIR = os.path.abspath(os.path.dirname(__file__))
+
 
 class TestUcdCam(ObsLsstObsBaseOverrides, ObsLsstButlerTests):
     instrumentDir = "ucd"
+    DATAROOT = os.path.join(TESTDIR, "data", "input")
 
     @classmethod
     def getInstrument(cls):
@@ -64,7 +68,7 @@ class TestUcdCam(ObsLsstObsBaseOverrides, ObsLsstButlerTests):
         raw_subsets = (({}, 2),
                        ({'physical_filter': 'r'}, 2),
                        ({'physical_filter': 'foo'}, 0),
-                       ({'exposure': 3023073000237}, 1), 
+                       ({'exposure': 3023073000237}, 1),
                        )
         linearizer_type = unittest.SkipTest
         self.setUp_butler_get(ccdExposureId_bits=ccdExposureId_bits,