fillminima

Module to implement filling of local minima in a raster surface.

The algorithm is from

Soille, P., and Gratin, C. (1994). An efficient algorithm for drainage network

extraction on DEMs. J. Visual Communication and Image Representation. 5(2). 181-189.

The algorithm is intended for hydrological processing of a DEM, but is used by the Fmask cloud shadow algorithm as part of its process for finding local minima which represent potential shadow objects.

fmask.fillminima.fillMinima(img, nullval, boundaryval)

Fill all local minima in the input img. The input array should be a numpy 2-d array. This function returns an array of the same shape and datatype, with the same contents, but with local minima filled using the reconstruction-by-erosion algorithm.

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