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8.3 Orbiting a static map

Our third animation keeps a fixed gridded data set but moves the camera angle around the full 360°. We use grdview to generate a shaded-relief image sequence using the new enhanced -E option. No additional information is plotted on the image. As before we produce an animated GIF image and a simple HTML wrapper for it.




#!/bin/sh
#               GMT ANIMATION 03
#
# Purpose:      Make web page with simple animated GIF of Iceland topo
# GMT progs:    gmtset, gmtmath, psbasemap, pstext, psxy, ps2raster
# Unix progs:   awk, mkdir, rm, mv, echo, convert, cat
#
# 1. Initialization
# 1a) Assign movie parameters
. gmt_shell_functions.sh
lon=-20
lat=65
dpi=100
x0=1.5
y0=0.75
px=4
py=2.5
el=35
az=0
name=`basename $0 '.sh'`
mkdir -p $$
gmtset DOTS_PR_INCH $dpi
frame=0
grdclip -Sb0/-1 -G$$_above.nc Iceland.nc
grdgradient -M -A45 -Nt1 $$_above.nc -G$$.nc
makecpt -Crelief -Z > $$.cpt
while [ $az -lt 360 ]; do
        file=`gmt_set_framename $name $frame`
        if [ $# -eq 0 ]; then   # If a single frame is requested we pick this view
                az=135
        fi
        grdview $$_above.nc -JM2.5 -C$$.cpt -Qi$dpi -B5g10/5g5 -E$az/${el}+w$lon/${lat}+v$x0/$y0 -P -X0.5i -Y0.5i --PAPER_MEDIA=Custom_${px}ix${py}i > $$.ps
        if [ $# -eq 0 ]; then
                mv $$.ps $name.ps
                gmt_cleanup .gmt
                gmt_abort "$0: First frame plotted to $name.ps"
        fi
        ps2raster $$.ps -Tt -E$dpi
        mv $$.tif $$/$file.tif
        az=`expr $az + 5`
        echo "Frame $file completed"
        frame=`gmt_set_framenext $frame`
done
convert -delay 10 -loop 0 $$/*.tif $name.gif
cat << EOF > $name.html
<HTML>
<TITLE>GMT 3-D perspective of Iceland</TITLE>
<BODY bgcolor="#ffffff">
<CENTER>
<H1>GMT 3-D perspective of Iceland</H1>
<IMG src="$name.gif" border=1>
</CENTER>
<HR>
Here we show ETOPO2 topography of Iceland as we move the view
point around the island.
<I>$name.sh: Created by $USER on `date`</I>
</BODY>      
</HTML>
EOF
# 4. Clean up temporary files
gmtset DOTS_PR_INCH 300
gmt_cleanup .gmt


Figure 8.3: Orbiting a static map.
\includegraphics[scale=0.5]{scripts/anim_03}


next up previous contents index
Next: 8.4 Flying over topography Up: 8. Creating GMT Animations Previous: 8.2 Examining DEMs using   Contents   Index
Paul Wessel 2009-02-16