Geocart Projections

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van der Grinten I

Classifications

Geocart menu class: Miscellaneous
Geocart family: van der Grinten
Polyconic
Neither conformal nor equal area

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 arcs, concave toward the nearest pole.
Poles: Points
Symmetry: Along 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.

Usage

World maps by the U.S. Department of Agriculture, the U.S. Geological Survey, the National Geographic Society, and others

Origin

Presented by Alphons J. van der Grinten (1852–?) of Chicago in 1898. U.S. patent obtained in 1904.

Other names

Van der Grinten (without l)

Similar projections

Lagrange is conformal.
Van der Grinten 11 has parallels curved to intersect meridians at right angles.
Mercator is conformal and has straight meridians and parallels.

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.