Graphics Programs Reference
In-Depth Information
colormap(flipud(gray.^4))
axis equal, view(0,90)
colorbar
This script opens a new fi gure window, generates the gray surface using
interpolated shading in an overhead view (Fig. 7.3).
7.5 The Shuttle Radar Topography Mission SRTM
The Shuttle Radar Topography Mission (SRTM) incorporates a radar
system that fl ew onboard the Space Shuttle
Endeavour
during an 11-day
mission in February 2000. SRTM is an international project spearheaded
by the National Geospatial-Intelligence Agency (NGA) and the National
Aeronautics and Space Administration (NASA). Detailed info on the SRTM
GTOPO30 Data Set
5
5500
4
5000
3
4500
2
4000
1
3500
3000
0
2500
-1
2000
-2
1500
-3
1000
-4
500
0
-5
30
31
32
33
34
35
36
37
38
39
40
Longitude
Fig. 7.3
Display of the GTOPO30 elevation data set. The map uses the function
surf
for generating
a gray surface. We use the colormap
gray
to power of four in order to darken the colormap with
respect to the higher elevation. In addition, we fl ip the colormap in up/down direction using
flipud
to obtain dark colors for high elevations and light colors for low elevations.
