Create statistics from GPX extensions

[carstengrimm]

I just discovered phpGPX and while i am only trying to read out my gpx files, i have quickly discovered that heart rate is no being read out...

gpxtpx:hr107</gpxtpx:hr>

i am not a coder myself and more like a user, so i'll leave that as suggestion for following releases.
other than that, i am really amazed how easily phpGPX can be integrated, while looking around the best way to calculate the total distance from GPX file, this has helped me tremendously.

[Sibyx]

Hi,
so you have problem with reading heart rate from GPX files at all or hr is not shown in statistics?

Currecntly I am calculating stats only for basic data as distance, elevation etc. I don't know exactly how to calculate stats properly from extension objects such as Garmin TrackPointExtension, because I want to find an universal way and support all the extensions in the end.

If you have problems with reading heart rate at all, that probably a bug which have to be fixed, so please let me know.

It's also nice to hear that phpGPX is easy to integrate and helpful for you :)

[carstengrimm]

(
[distance] => 6513.8143967259
[avgSpeed] => 3.4907901375809
[avgPace] => 286.46809478298
[minAltitude] => 122
[maxAltitude] => 132.9
[cumulativeElevationGain] => 40.1
[startedAt] => 2016-08-25T20:42:35+00:00
[finishedAt] => 2016-08-25T21:13:41+00:00
[duration] => 1866
)

that's one of my sample gpx files which are output (dumped from $track->stats->toArray())

while the gpx file obviously uses heart rate too.. gpxtpx:hr on each gps tracking i guess i could still get it done (i have used simplexml on gpx files before) but i don't want to run 2 seperate readouts for HR while phpGPX already is very simplistic...

<trkpt lat="50.162982000" lon="8.623605000">
   <ele>128.5</ele>
   <time>2016-08-25T20:44:18Z</time>
   <extensions>
      <gpxtpx:TrackPointExtension>
         <gpxtpx:hr>152</gpxtpx:hr>
      </gpxtpx:TrackPointExtension>
   </extensions>
</trkpt>

[Sibyx]

The stats attribute contains only aggregated/calculated data from GPX file ($track->stats object contain statistics from the whole file - all segments & points). If you want to access extensions data (gpxtpx:hr is not part of original GPX specification, but it's an Garmin TrackPoint extension - fully supported by phpGPX).

Heart rate belongs to point, not to whole track. phpGPX not currently support stats for the extensions as I said before. I am looking for the best implementation how to calculate stats for all kind of extensions.

If you want to access Garmin TrackPointExtension data, you can use

$track->segments[0]->$points[0]->extensions->trackPointExtension->hr;

var_dump($track->segments[0]->points[0]->extensions->trackPointExtension->);

If you still can't find the extension data, please let me know, is probably a bug which have to be fixed. I hope I helped you, if there is still something unclear feel free to ask ;)

[carstengrimm]

yeah i can call each single point...
i guess i would have to go manually iterate though each point[$i]->extension->track...->hr;
and calculate the average

[Sibyx]

Yop,
I am so sorry but currently there is no other way :( But once I will be done with tests and new documentation, this is the first thing for marked for implementation.

[carstengrimm]

no worries

[Sibyx]

I would like to implement this using middlewares in 2.x. Please check #67 for more information.