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

[Ills]

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
(6356752.3).
 
This seems to be different from the normal mean earth radius used by GCTP
(6370997).

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. 

Ills



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