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Aspect
Documentation of aspect calculations
The aspect is the direction of a slope.
GenPhysX calculates the aspect of a digital terrain model. Aspect is calculated for each 90-degree grid point. It has been agreed that when slopes are zero, for example on water surfaces, the average aspect per quadrant will be zero for all quadrants.
Most of the database are tiled, for slope and aspect we need to load more than one tile at a time to get the values on borders so depending on the tiling mechanism of each database, the processing is different. At the moment we only did the algorithms for SRTM-DEM, CDED50 and CDED250.
Since GDAL 1.7.0, there's gdaldem that can compute aspect directly.
See this entry on how to correctly calculate the average aspect (i.e. we can't average azimuths directly).