5.4.6 Cylindrical Equidistant Projection (-–Jq -–JQ)

This simple cylindrical projection is really a linear scaling of longitudes and latitudes (if you desire a different scaling for one of the axes you must choose the linear projection -–Jx and append d for degrees; see Section 5.1.4.) It is also known as the Plate Carrée projection. All meridians and parallels are straight lines. The requirements to define this projection are:

$\bullet$

The central meridian

$\bullet$

Scale in inch/degree or as 1:xxxxx (-Jq), or map width (-JQ)

A world map centered on the dateline using this projection can be obtained by running the command:

#!/bin/sh
#    $Id: GMT_equi_cyl.sh,v 1.1 2001/03/21 04:10:21 pwessel Exp $
#

pscoast -R0/360/-90/90 -JQ180/4.5i -B60f30g30 -Dc -A5000 -G0 -P > GMT_equi_cyl.ps

Figure 5.23: World map using the equidistant cylindrical projection