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

Finn, Michael mfinn at usgs.gov
Fri Jul 8 16:09:07 EST 2016


I can confirm the value of the radius used by GCTP if it helps any.


On Thu, Jul 7, 2016 at 9:00 AM, Ills <mangahair at gmail.com> wrote:

> 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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