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MODIS Sinusoidal (Google it)

This is a corrected version of SR-ORG:6842, describing the global sinusoidal projection used by many MODIS land products. The projection uses a spherical projection ellipsoid but a WGS84 datum ellipsoid. Not all projection software recognizes the "semi_major" and "semi_minor" arguments to Sinusoidal projections. If yours does not, you may be happier using SR-ORG:6842 and coping with the fact that it may introduce datum-shift errors down the road. This is a variation on SR-ORG:6965 that uses the authalic mean radius of the Earth for projection rather than the major radius, in keeping with files distributed by NASA/USGS.