#!/bin/sh # GMT EXAMPLE 29 # $Id: job29.sh,v 1.4 2010/01/12 18:23:52 remko Exp $ # # Purpose: Illustrates spherical surface gridding with Green's function of splines # GMT progs: makecpt, grdcontour, grdgradient, grdimage, grdmath greenspline, psscale, pstext # Unix progs: rm, echo # ps=example_29.ps # This example uses 370 radio occultation data for Mars to grid the topography. # Data and information from Smith, D. E., and M. T. Zuber (1996), The shape of # Mars and the topographic signature of the hemispheric dichotomy, Science, 271, 184â187. # Make Mars ellipsoid given their three best-fitting axes: a=3399.472 b=3394.329 c=3376.502 grdmath -Rg -I4 -F X COSD $a DIV DUP MUL X SIND $b DIV DUP MUL ADD Y COSD DUP MUL MUL Y SIND $c DIV \ DUP MUL ADD SQRT INV = ellipsoid.nc # Do both Parker and Wessel/Becker solutions (tension = 0.9975) greenspline -Rellipsoid.nc mars370.in -D4 -Sp -Gmars.nc greenspline -Rellipsoid.nc mars370.in -D4 -SQ0.9975/5001 -Gmars2.nc # Scale to km and remove ellipsoid grdmath mars.nc 1000 DIV ellipsoid.nc SUB = mars.nc grdmath mars2.nc 1000 DIV ellipsoid.nc SUB = mars2.nc makecpt -Crainbow -T-7/15/1 -Z > mars.cpt grdgradient mars2.nc -M -Ne0.75 -A45 -Gmars2_i.nc grdimage mars2.nc -Imars2_i.nc -Cmars.cpt -B30g30Wsne -JH0/6i -P -K -Ei \ -U"Example 29 in Cookbook" --ANNOT_FONT_SIZE_PRIMARY=12 > $ps grdcontour mars2.nc -J -O -K -C1 -A5 -Glz+/z- >> $ps psxy -Rg -J -O -K -Sc0.045i -Gblack mars370.in >> $ps echo "0 90 14 0 1 LB b)" | pstext -R -J -O -K -N -D-3i/-0.2i >> $ps grdgradient mars.nc -M -Ne0.75 -A45 -Gmars_i.nc grdimage mars.nc -Imars_i.nc -Cmars.cpt -B30g30Wsne -J -O -K -Y3.6i -Ei --ANNOT_FONT_SIZE_PRIMARY=12 >> $ps grdcontour mars.nc -J -O -K -C1 -A5 -Glz+/z- >> $ps psxy -Rg -J -O -K -Sc0.045i -Gblack mars370.in >> $ps psscale -Cmars.cpt -O -K -D3i/-0.1i/5i/0.1ih -I --ANNOT_FONT_SIZE_PRIMARY=12 -B2f1/:km: >> $ps echo "0 90 14 0 1 LB a)" | pstext -R -J -O -N -D-3i/-0.2i >> $ps # Clean up rm -f *.nc mars.cpt .gmt*
