From flat to shperical

[johnvanvliet]

a few example grids that one can make using MMPS
http://www.users.globalnet.co.uk/~arcus/mmps

MMPSproject stereographic -grid -w 2048 -h 1024  -f 2k.ppm -out 2k.stereographic.ppm
  MMPSproject mercator -grid -w 2048 -h 1024  -f 2k.ppm -out 2k.mercator.ppm
  MMPSproject cylindrical -grid -w 2048 -h 1024  -f 2k.ppm -out 2k.cylindrical.ppm
  MMPSproject sinusoidal  -grid -w 2048 -h 1024  -f 2k.ppm -out 2k.sinusoidal.ppm
  MMPSproject equalarea -grid -w 2048 -h 1024  -f 2k.ppm -out 2k.equalarea.ppm
  MMPSproject stereographic -lat 90  -grid -w 2048 -h 1024  -f 2k.ppm -out 2k.stereographic90n.ppm
  MMPSproject mollweide -grid -w 2048 -h 1024  -f 2k.ppm -out 2k.mollweide.ppm
  MMPSproject gnomonic -lat 45 -long 180 -grid -w 2048 -h 1024  -f 2k.ppm -out 2k.gnomonic.ppm

with qgis you can really make it exact