The Van der Grinten IV projection is a polyconic, spherical projection that is neither conformal nor equal area. Alphons J. van der Grinten first presented it in 1904. It is sometimes known as the “Apple Shaped” projection, and is primarily (but rarely) used for world maps.
The central meridian and Equator are straight lines. Other meridians are circular, equally spaced along the Equator and concave toward the central meridian. Other parallels are circular, equally spaced along the central meridian, and concave toward the nearest pole. The poles are represented as points. Scale is true along the central meridian and the Equator.
The "VanDerGrintenIV" Projection has the following Parameters:
|
Parameter Name |
Parameter String |
Units |
|
Longitude of the Center of the Projection |
central_meridian |
|
|
False Easting |
false_easting |
|
|
False Northing |
false_northing |
NOTE: Only a spherical form of this projection is used. The semi-major axis of the ellipsoid (sphere) is used for forward and inverse projection from grid to geodetic coordinates within the system wherein this projection is incorporated.