Geoscience Reference
In-Depth Information
Figure 6:
Triangulation of streams and watersheds for DEM generalization
Algorithm proved to be generally preserving main forms, characteristic
heights, slope bends and structure lines. However, testing of it revealed
some shortcomings, that need further developments:
•
Algorithm does not encounter horizontal distance between valleys. This
criteria should be used along with length during stream generalization to
avoid excessive number of negative forms and preserve correct balance
of positive and negative from areas.
•
Not everywhere a correct shape of contour bends in upper reaches is
preserved which indicates the morphology and genesis of relief.
•
Some profile smoothing and distortion takes place during low/high
quartile filter postprocessing (
Figure 10
). We believe that this process
should be adaptive to local topography and with respect to hypsometric
scale chosen: a certain balance of filters should be found.
