Two Point Equidistant

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The Two Point Equidistant projection is used to show the distance from "either of two chosen points to any other point on a map" (Environmental Systems Research Institute, 1997). Note that the first point has to be west of the second point. This projection has been used by the National Geographic Society to map areas of Asia.

Construction

Modified planar

Property

Compromise

Meridians

N/A

Parallels

N/A

Graticule spacing

N/A

Linear scale

N/A

Uses

Two Point Equidistant projection "does not represent great circle paths" (Environmental Systems Research Institute, 1997).

There is little distortion if two chosen points are within 45 degrees of each other.

Source: Environmental Systems Research Institute, 1997

This projection contains these unique parameters:

Longitude of 1st point

Latitude of 1st point

Longitude of 2nd point

Latitude of 2nd point

Two Point Equidistant Projection

map_projection_two_point_equidistant

Source: Snyder and Voxland, 1989