lib: Add new SRTM_percent color table (#4608)

This color table uses the color ramp from the srtm_plus color table for terrain to create colors for relative elevation (spread over the range of elevations in a raster map) rather than absolute elevation in meters. This applies srtm colors in a way similar to the way the elevation color table applies them. This color table is especially useful in creating nice looking elevation maps and shading relief maps.
OSGeo · Nov 1, 2024 · 4385b26 · 4385b26
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diff --git a/lib/gis/colors.desc b/lib/gis/colors.desc
@@ -48,6 +48,7 @@ sepia: yellowish-brown through to white
 slope: r.slope.aspect-type slope colors for raster values 0-90
 soilmoisture: soilmoisture color table (0.0-1.0)
 srtm: color palette for Shuttle Radar Topography Mission elevation
+srtm_percent: color palette for Shuttle Radar Topography Mission using relative elevation
 srtm_plus: color palette for Shuttle Radar Topography Mission elevation (with seafloor colors)
 terrain: global elevation color table covering -11000 to +8850m
 viridis: perceptually uniform sequential color table viridis

diff --git a/lib/gis/colors/srtm_percent b/lib/gis/colors/srtm_percent
@@ -0,0 +1,7 @@
+0%   57 151 105
+25%  117 194 93
+40%  230 230 128
+55%  214 187 98
+70%  185 154 100
+80%  150 120 80
+100% 220 220 220