How could I extract all peaks from a DEM (large mountainous area) using GRASS?
Peak means something like: a pixel which is sourrounded by other pixels with smaller elevation numbers in a area arround the "peak-pixel" of about 100m.
Answer
Use the grass module r.param.scale with the "param=feature" option. THis creates an output map with each pixel categorized as peak, ridge, channel, plane, etc. Peaks are given category 6 (ridges=5, etc)
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