Eckert III Projection

The Eckert III projection is a pseudocylindrical projection that is neither conformal nor equal area. This projection was presented by Max Eckert in 1906 and is used primarily for world maps.

Meridians in this projection are equally spaced semi-ellipses, concave toward the central meridian. The central meridian is a straight line half as long as the Equator. Parallels are represented by equally spaced straight parallel lines that are perpendicular to the central meridian. Poles are represented by lines half as long as the Equator. This projection is symmetrical about the central meridian or the Equator. Scale is true along latitudes 35°58' N and S, and constant along any given latitude.

The "EckertIII" Projection has the following Parameters:

Parameter Name

Parameter String

Units

Longitude of the Center of the Projection

central_meridian

AngularValue

False Easting

false_easting

LinearValue

False Northing

false_northing

LinearValue

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.