Watershed delineation in Python with pysheds: the River Derwent above Ladybower
Delineate a catchment and its stream network from a free DEM in Python with pysheds: fill pits and depressions, D8 flow direction, flow accumulation, snapping the pour point, catchment polygon and area, Strahler stream order and drainage density, all checked against the official NRFA boundary for the River Derwent at Yorkshire Bridge in the Peak District.