Eckert III

Description

This pseudo cylindrical projection is used primarily for world maps.

Projection method

A pseudo cylindrical projection.

Linear graticules

Parallels are equally spaced straight lines. Meridians are equally spaced elliptical curves. The meridians at +/-180° from the central meridian are semicircles. The poles and the central meridian are straight lines half as long as the equator.

Properties

Shape

This stretching decreases to zero at 37°55' N and S. Nearer the poles, features are compressed in the north–south direction.

Area

Area isn't preserved.

Direction

The equator doesn't have any angular distortion. Direction is distorted elsewhere.

Distance

Scale is correct only along 37°55' N and S. Nearer the poles, features are compressed in the north–south direction.

Limitations

Useful only as a world map.

Uses and applications

Suitable for thematic mapping of the world.

Parameters

Desktop

• False Easting
• False Northing
• Central Meridian

Note:

Supported on spheres only.

geographic_coordinate_systems.pdf	A geographic coordinate systems pdf file which contains lists of supported gcs and vcs.
projected_coordinate_systems.pdf	A projected coordinate systems pdf file which contains lists of supported pcs.
geographic_transformations.pdf	A geographic transformations pdf file which contains lists of supported geographic and vertical transformations.