Geodesy API +- HP Forums (http://www.hpmuseum.org/forum) +-- Forum: HP Software Libraries (/forum-10.html) +--- Forum: HP Prime Software Library (/forum-15.html) +--- Thread: Geodesy API (/thread-7062.html)

Geodesy API - StephenG1CMZ - 10-17-2016 03:49 PM A collection of useful geodesy routines. Disclaimer: Not for navigational use. No liability accepted. Version 0.3 implements LatLong-to-distance calculations. Spherical calculations use Haversine. Ellipsoidal calculations use Vincenty. These routines have not been tested apart from a handful of values. Version 0.31 fixes the typo in the inverse Vincenty (LatLon to distance). It also adds more predefined ellipsoids (including the recently announced roundest object in nature) and a few routines. Note that the Direct Vincenty routine (LatLon and distance to LatLon2) is included for debugging only It's results as implemented here are known to be incorrect by about 100 km, or worse. Version 0.31 worked on my calculator but used code in backups]...After deleting backups once the code was here, it didn't, and was replaced by V 0.32. A compiler option to ignore backups would be useful. Version 0.33 is a backup containing investigative test data. If I am understanding the results correctly, two identical calls of the Direct Vincenty routine return different results . First 41 degrees latitude is returned, then 47 degrees. Direct spherical also returns 47. Not sure when I will get the time to look into this, so thought I ought to mention the mistake in case anyone is using V0.32.