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Identify a hydrological catchment based on a single direction flow algorithm
subcatch(DEM,outlet)
A matrix representing a digital elevation model [m] with equally sized pixels and equal x and y resolution
A vector containing the row and column indices of the pixel representing the catchment outlet.
A binary matrix of the same size as DEM.
DEM
See http://paramo.cc.ic.ac.uk/topmodel_tutorial for examples.
topmodel