6.3.6 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 5.1.1.) It is also known as the Plate Carrée projection. All meridians and parallels are straight lines. The requirements to define this projection are:

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The central meridian

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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:

pscoast -Rg -JQ180/4.5i -B60f30g30 -Dc -A5000 -Gblack -P > GMT_equi_cyl.ps

Figure 6.18: World map using the equidistant cylindrical projection.