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7.8 A 3-D histogram

The program psxyz allows us to plot three-dimensional symbols, including columnar plots. As a simple demonstration, we will convert a gridded netCDF of bathymetry into an ASCII table and use the height information to draw a 2-D histogram in a 3-D perspective view. Our gridded bathymetry file is called topo.grd and covers the region from 0 to 5 °E and 0 to 5 °N. Depth ranges from -5000 meter to sea-level. We produce the illustration by running this command:

    #!/bin/csh
    #        GMT EXAMPLE 08
    #
    #        $Id: job08.csh,v 1.10 2006/11/02 19:42:41 pwessel Exp $
    #
    # Purpose:    Make a 3-D bar plot
    # GMT progs:    grd2xyz, pstext, psxyz
    # Unix progs:    echo, rm
    #
    grd2xyz guinea_bay.nc >! $$.txt
    psxyz $$.txt -B1/1/1000:"Topography (m)"::.ETOPO5:WSneZ+ -R-0.1/5.1/-0.1/5.1/-5000/0 \
       -P -JM5i -JZ6i -E200/30 -So0.0833333ub-5000 -U"Example 8 in Cookbook" -Wthinnest -Glightgray -K >! \
       example_08.ps
    echo '0.1 4.9 24 0 1 TL This is the surface of cube' | pstext -R -J -JZ -Z0 -E200/30 -O \
       >> example_08.ps
    \rm -f .gmt* $$.txt

The output can be viewed in Figure 7.8.

Figure 7.8: A 3-D histogram.

Next: 7.9 Plotting time-series along Up: 7. Cook-book Previous: 7.7 A simple location Contents Index