Pick a
direction, and an allowable gap (points must be separated by more than the gap
tolerance. The algorithm starts on the specified
edge of the map (two edges for NE, SW, SE, and NW directions) and retains the
first point. All successive points that are filled, with the gap
tolerance, are removed.
Currently the following directions have been implemented since that was the
known direction of dune motion.
Western
Southwestern
This example shows dune slip faces on
asymmetric dunes, starting with a slope map with
gentle slopes removed. Difference between W and
SW edges minimal.
