How do I get a rectangular projection from an ortographic projection

[johnvanvliet]

for assuming that the center is 0 long 0 lat
mmps will do
there can be a file name collision if "GMT" is also installed
-- if so rename the mmsp "project" to "MMPSproject"

MMPSproject -w 1024 -h 512 -scale 0.9 -i orthographic -f  3471676.ppm > 3471676test.ppm

but it is not
( lat and long is a very loose guess )

MMPSproject -long -98 -lat 39 -w 1024 -h 512  -i orthographic -f  3471676.ppm > 3471676test1.ppm

for qgis and accuracy
http://www.qgistutorials.com/en/docs...ng_basics.html

qgis will take time ( not something i can do while typing this )