Eckert IV
The Eckert IV 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. 180th meridians of the Eckert IV projection are semicircle, and all other meridians are equally spaced elliptical arcs. 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 40ยบ30' N and S.
The "Eckert IV" Projection has the following parameters:
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Longitude of natural origin
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Spherical Radius
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False Northing
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False Easting
Note: 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.