Eckert-Greifendorff

Classifications

lenticular
equal-area

Graticule

Meridians: Central meridian is a straight line 0.46 of the length of the equator. Other meridians are curved, unequally spaced along the equator and concave toward the central meridian.
Parallels: Equator is straight. Other parallels are curved, unequally spaced along the central meridian and concave toward the nearest pole.
Poles: Points.
Symmetry: About the central meridian or the equator.

Scale

Decreases steadily along the equator and the central meridian with distance from the center of the projection.

Distortion

Moderate near center, but considerable shape distortion near outer meridians.

Other features

An equatorial aspect of the Lambert azimuthal equal-area projection for 90° of longitude, on which the horizontal coordinates have been quadrupled and the meridians have been given four times their original longitudes.

Usage

Whole-world map.

Similar projections

Hammer, a different modification of the Lambert azimuthal equal-area projection.
Quartic Authalic has straight parallels.

Origin

Max Eckert-Greifendorff (formerly Max Eckert) (1868-1938) of Germany in 1935.

Description adapted from J.P. Snyder and P.M. Voxland, An Album of Map Projections, U.S. Geological Survey Professional Paper 1453. United States Government Printing Office: 1989.