Eckert IV

Producer Field Guide

HGD_Product
Producer Field Guide
HGD_Portfolio_Suite
Producer

Eckert IV projection is best used for thematic maps of the globe. An example of a thematic map is one depicting land cover.

Construction

Pseudocylinder

Property

Equal-area

Meridians

Meridians are elliptical arcs that are equally spaced.

Parallels

Parallels are straight lines that are unequally spaced and closer together at the poles.

Graticule spacing

See Meridians and Parallels. The poles and the central meridian are straight lines one half the length of the Equator.

Linear scale

"Scale is distorted north-south 40 percent along the Equator relative to the east-west dimension. This distortion decreases to zero at 40° 30’ N and S and at the central meridian. Scale is correct only along these parallels. Nearer the poles, features are compressed in the north-south direction" (Environmental Systems Research Institute, 1997).

Uses

World maps only.

Source: Environmental Systems Research Institute, 1997

Eckert IV Projection

map_projection_eckert_4

Source: Snyder and Voxland, 1989