A georeferenced rendering of a Bare Earth model to give a digital raster image the impression of a 3D shape through the application of shadows derived as a function of terrain slope and artificial sun angle.

The Hillshade function obtains the hypothetical illumination of a surface by determining illumination values for each cell in a raster. It does this by setting a position for a hypothetical light source and calculating the illumination values of each cell in relation to neighboring cells. It can greatly enhance the visualization of a surface for analysis or graphical display, especially when using transparency.

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