Write index and data file merge program #6
Description
It may be desirable to merge many days of data files or grid point index files together to improve query speed.
This should be done by computing intermediate merge files for a week or month at a time. Merging index files should be relatively quick because of their simple structure.
Merging data files should also be fairly quick because all data elements should already be sorted. Having a fixed mapping from grid point to data file might be desirable to facilitate that merging.