Geocart Projections

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van der Grinten III

Classification

Geocart menu class: Pseudocylindric
Geocart family: van der Grinten
Modified pseudocylindric
Neither conformal nor equal area

Graticule

Meridians: Central meridian is straight. Other meridians are circular, equally spaced along the Equator but unequally spaced along other parallels and concave toward the central meridian.
Parallels: Straight lines
Poles: Points
Symmetry: About the central meridian or the Equator

Scale

True along the Equator. Increases rapidly with distance from the Equator.

Distortion

Great distortion of area near the poles

Other features

The world is enclosed in a circle. Spacing of parallels along the central meridian is the same as that for Van der Crinten I.

Usage

World maps, but rarely

Origin

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

Similar projections

Van der Grinten I has curved parallels.
“The Times”, by Moir, has nearly elliptical meridians, but straight parallels are spaced like those of the Gall projection.

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.