Extract ridge/valleys

Again this is more an intention than a true useful tool. While it works reasonably well (but be careful and do not abuse with grid size) in extracting ridges (only working mode) the problem is that the ppa (ref) algorithm used outputs the crest lines as a sequence of non-contiguous two point lines segments. This makes it impossible to treat them as polylines.

Copyright <2010>, <Joaquim Luis>

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