next up previous contents index
Next: Cook-book Up: Miscellaneous Projections Previous: Sinusoidal Projection –(-Ji -–JI)

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:





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
\begin{figure}\centering\epsfig{figure=eps/GMT_grinten.eps}\end{figure}

     

   


Paul Wessel
1999-12-03