The Eckert VI projection was created by Max Eckert in 1906, and is used for world maps. It is a pseudocylindrical projection whose central meridian is a straight line. Meridians on the Eckert VI projection are equally spaced sinusoidal curves. The parallels are unequally spaced straight lines parallel to one another, and the poles are straight lines half as long as the equator. Scale is true along latitude 49ยบ16' N and S.
The "Eckert VI" projection has the following parameters:
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Longitude of natural origin (central meridian)
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Spherical Radius
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False Northing
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False Easting
Only a spherical form of this projection is used. If the spherical radius parameter is set to a value greater than zero, then it will be used as the radius of the sphere. If this parameter is set to a value less than or equal to zero, then the semi-major axis of the ellipsoid will be used as the radius of the sphere.