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_minor" argument 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.