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False positives in Viewsheds is something i have tried to highlight a few times including in a GISRUK 2012 poster (available on my Linkedin page - David Roberts-Lock), to resolve it i always obtain a LiDAR DTM model as well and then (using Raster Calculator on the two esri grids do DSM - DTM) this gives me a raster i class as Obstructions (or surface ...



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