Here's an alternative to creating a raster "pseudo-elevation" data set of values for thematic data visualization: keep your polygons in vector and extrude based on the thematic value. This gives good color control - particularly on the sides of the extruded polygons - and lets you combine these with a real elevation data set (click for high res version):
The image above illustrates absolute population growth for Colorado counties between 1990 and 2000.
An additional advantage of this technique: you can make your polygons transparent (click for high res version):
...and you can easily change views without adding more thematic data:
Tuesday, December 7. 2010
Thematic Data Visualization
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