produce a gradient file using surface elevation data, and plot it using grdimage with topographic &q

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http://web.mst.edu/~sgao/gmtexs/grd/ex05/plot.gmt
#!/bin/csh /bin/rm tmp.ps tmp.cpt ## Make a basemap of western United States: psbasemap -R-126.000/-100.000/30.500/50.000 \\ -JM5 -Ba5f1 -P -X2.0 -Y2 -K >tmp.ps ## Convert the xyz file into GRD file using xyz2grd awk \'{print $1, $2, $4}\' data.dat | xyz2grd -R -I0.5 -Gtmp.grd ## Resample tmp.grd from coarse (0.5 deg.) into finer resolution (0.1 degree) using grdsample. # The output file is tmph.grd. grdsample tmp.grd -Gtmph.grd -I0.1 -Ql/0.1 -Lx ## Make a color table makecpt -Crainbow -T410/450/20 -Z >tmp.cpt ## Make a gradient file out of elevation data to be used as "shade" of the image # The output intensity file is tmph.int. The "light" comes from 45 degree (Northeast) # "N" is for normalization (otherwise the gradients will be too large) # Cut out the portion of elevation data from a global database # The output is topo0.grd grdcut /home/sgao/Dbase/topo1min/data.grd -Gtopo0.grd -R ## Resample it into the same interval as tmph.grd grdsample topo0.grd -Gtopoh.grd -I0.1 -Ql/0.1 -Lx ## Produce the gradient file. This time I usd -Nt to make a more dramatic shade grdgradient topoh.grd -Gtopoh.int -A45 -Nt ## Produce the image using the resampled grd file and tmp.int grdimage tmph.grd -Itopoh.int -Ctmp.cpt -R -J -O -K >>tmp.ps ## Plot the scale bar at the bottom of the plot psscale -D2.5/-0.4/5.0/0.1h -B10 -Ctmp.cpt -O -K >>tmp.ps ## Overlay with coastlines and political boudnaries pscoast -R -J -W3 -Df -Na/1/0t10:5_0 -A1000 -O -K -B >>tmp.ps ## Add a title pstext -R -J -O -N <<END>>tmp.ps -113 51 15 0 0 6 Depth of the 410 km discontinuity: Preliminary results END ## Convert tmp.ps into a JPG file: ps2jpeg100 tmp.ps

 


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