[Proj] Difference in Orthographic projection between Proj4 and Global Mapper

Ills mangahair at gmail.com
Thu Jul 7 10:00:06 EST 2016

Thanks for all the replies and suggestions so far, 

After more testing, which shows that we can get identical results in proj4
as GlobalMapper using a spheroid radius of 6367444.66m. This is the midpoint
of the standard WGS84 semi-major (6378137) and semi-minor axes radii
This seems to be different from the normal mean earth radius used by GCTP

Waiting on a a reply from Blue Marble, loathing to think about all the data
which could now be wrong and again thanking you all for your time. 


View this message in context: http://osgeo-org.1560.x6.nabble.com/Difference-in-Orthographic-projection-between-Proj4-and-Global-Mapper-tp5275097p5275198.html
Sent from the PROJ.4 mailing list archive at Nabble.com.

More information about the Proj mailing list