5.5.7 Van der Grinten Projection (-–Jv -JV)

The Van der Grinten projection, presented by Alphons J. van der Grinten in 1904, is neither equal-area nor conformal. Central meridian and Equator are straight lines; other meridians are arcs of circles. The scale is true along the Equator only’. Its main use is to show the entire world enclosed in a circle. To use it you must enter

$\bullet$

The central meridian

$\bullet$

Scale along equator in inch/degree or 1:xxxxx (-Jv), or map width (-–JV)

Centered on the Dateline, the example below was created by this command:

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

pscoast -R0/360/-90/90 -JV180/4i -Bg30/g15 -Dc -G200 -A10000 -W0.25p -P > GMT_grinten.ps

Figure 5.34: World map using the Van der Grinten projection