Hi, I've implemented a viewshed algorithm a while ago, by utilizing a modified version of the algorithm published at https://www.asprs.org/wp-content/uploads/pers/2000journal/january/2000_jan_87-90.pdf
With this approach, it was crucial to provide a fast real-time option for the viewshed calculation on relatively large raster DEMs by using only a small memory footprint. The implementation can be found here: https://github.com/szekerest/gdal/blob/viewshed/gdal/alg/viewshed.cpp https://github.com/szekerest/gdal/blob/viewshed/gdal/apps/gdal_viewshed.cpp Does it make sense to spend some more effort and incorporate this approach in GDAL officially? Best regards, Tamas
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