how to calculate topographic shadows (not shaded relief)

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Matt 2011-8-30

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https://ww2.mathworks.cn/matlabcentral/answers/14766-how-to-calculate-topographic-shadows-not-shaded-relief

评论： Raul Arribas 2023-1-11

I'm looking for an efficient way to calculate topographic shading. By this I mean calculating the shadow a mountain would cast given a sun position, not simply the normal angle of a pixel towards the sun. So I'm looking for something like los2.m instead of lightm.m. The roadblock with los2 is that it requires a lat/lon/elev for the light source, and the only solar calculators I can find return an azimuth/zenith. In the end what I want to do is ingest a geotiff DEM and then calculate mountain shadows for any day and time or year. It doesnt have to be exact, so convenient approximateions would likely be fine; it also has to work above the arctic circle. Any ideas would be appreciated.