Terrain

DTM generalisation

sculpt_dtm	This algorithm generalizes a Digital Terrain Model (DTM) by smoothing the terrain while preserving significant features such as ridges and valleys.
douglas_peucker_3d_DTM	Generalise a DTM based on a selection of points in 3D, in a fashion similar to the Douglas-Peucker algorithm.

DTM tools

calculate_curvature_and_slope	Computes approximations of the curvature (profile/plan) and the slope in an input DEM.
calculate_hillshade	Computes the hillshade of an input DEM based on pure numpy operations.