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

Thomas Knudsen knudsen.thomas at gmail.com
Thu Jul 7 04:32:20 EST 2016

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


-6830.53        11124.18

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