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

[Thomas Knudsen]

Does this solve the problem? (taking the radius from the remotesensing page
you referred to):

$ echo -3.1 52.1 | proj +proj=ortho +lat_0=52 +lon_0=-3 +x_0=0 +y_0=0
+a=6370997 +f=0 +units=m +no_defs

Output:

-6830.53        11124.18

/Thomas
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