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Hill Shade can be used to obtain hypothetical illumination of a surface by determining the illumination values
for each cell in a raster grid file. Hill shading darkens areas that are sloped, or darkens areas
that are obscured by the higher elevated areas. It works on the premise of brightening areas that face the sun directly.
Hill shading can significantly enhance the visualization of a surface for analysis or graphical display,
especially when using transparency.
The source sun position used for shading and highlighting are independent, however sun highlight cannot be enabled without enabling sun shading.
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