van der Grinten IV

apple shaped

Classifications

polyconic
globular

Graticule

Meridians: Central meridian is straight. Other meridians are circular, equally spaced along the equator and concave toward the central meridian.
Parallels: Equator is straight. Other parallels are circular, equally spaced on the central meridian and concave toward the nearest pole.
Poles: Points.
Symmetry: About the central meridian or the equator.

Scale

True along the central meridian and the equator.

Distortion

Great distortion of area near the 180th meridians at higher latitudes.

Other features

The 90th meridians form a complete circle.

Usage

World maps, but rarely.

Similar projections

Eisenlohr is conformal.
August epicycloidal is conformal.

Origin

Presented by Alphons J. Van der Grinten (1852–?) of Chicago in 1904.

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.