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I used the following algorithm to calculate many shaded reliefs (SRTM, ASTER) with different illumination directions. It is AML code, but it should be no problem to identify the corresponding Spatial Analyst functions and raster calculator expressions. shade225 = hillshade(dgm, 225, 65, shade, 15) shade270 = hillshade(dgm, 270, 65, shade, 15) shade315 = ...

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