Geocart Projections

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Eckert VI

Classifications

Geocart menu class: Pseudocylindric
Geocart family: Eckert
Pseudocylindric
Equal area

Graticule

Meridians: Central meridian is a straight line half as long as the Equator. Other meridians are equally spaced sinusoids, concave toward the central meridian.
Parallels: Equally spaced straight parallel lines, widest separation near the Equator. Perpendicular to the central meridian.
Poles: Lines half as long as the Equator
Symmetry: About the central meridian or the Equator

Scale

True along latitudes 49°16' N. and S. Constant along any given latitude; same for the latitude of opposite sign

Distortion

Free of distortion only at latitudes 49°16 N. and S. at the central meridian

Usage

Thematic world maps in Soviet World Atlas of
Some recent use for climatic maps by U.S. publishers
Origin
Presented by Max Eckert (1868-1938) of Germany in 1906.

Similar projections

Eckert V projection has meridians positioned identically, but parallels are equally spaced.
Wagner I projection (1932) is almost identical to Eckert VI, but Wagner I uses only part of the sinusoidal curve.
Kavrayskiy Vl projection (1936) is identical to Wagner I. Werenskiold II projection (1944) is the same as Wagner I, except for scale.
McBryde-Thomas Flat-Polar Sinusoidal uses the full sinusoid and is equal area, but the poles are one-third the length of the Equator.

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.