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Combining
Elevation Data With Raster Images
Elevation data in the form of digital elevation models can be used to
dramatically enhance
scenes in geographically referenced images such as digital raster graphics
from the United
States Geological Survey and digital orthophotos that can be downloaded
free from a
variety of sources. Below we have demonstrated the technique using data
from the Six
Mile Creek Natural Area in Ithaca, NY. Images such as these can be generated
for
virtually any location in the United States.
For excellent discussions on rendering cartographic relief using digital
methods visit
www.reliefshading.com and www.shadedrelief.com.
Examples
of the Raw Data
Digital
raster graphics combined with
hillshading based on the digital elevation model.
Digital
orthophoto combined with
hillshading based on the digital elevation model.
Another
example of a digital raster graphics combined with
hillshading based on the digital elevation model.
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