Eckert III

Producer Field Guide

HGD_Product
Producer Field Guide
HGD_Portfolio_Suite
Producer

In the Eckert III projection, "no point is free of all scale distortion, but the Equator is free of angular distortion" (Snyder and Voxland, 1989).

Construction

Pseudocylinder

Property

Area is not preserved.

Meridians

Meridians are elliptical curves that are equally spaced elliptical curves. The meridians +/- 180° from the central meridian are semicircles. The poles and the central meridian are straight lines one half the length of the Equator.

Parallels

Parallels are equally spaced straight lines.

Graticule spacing

See Meridians and Parallels. Pole lines are half the length of the Equator. Symmetry exists at the central meridian or the Equator.

Linear scale

Scale is correct only along 37° and 55’ N and S. Features close to poles are compressed in the north-south direction.

Uses

Mapping the world.

Source: Environmental Systems Research Institute, 1997

Eckert III Projection

map_projection_eckert_3

Source: Snyder and Voxland, 1989