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How to Select Invisible Sub-watersheds Based on a Viewshed Raster

Question asked by jz227_dukeuniv on Dec 10, 2017
Latest reply on Dec 10, 2017 by Dan_Patterson

I am working on a project selecting sites which cannot be visible from the research station entrance. I have a polygon layer defining the boundaries of all sub-watersheds. I created a watershed raster and a viewshed raster. My question now is to how to select sub-watersheds that are not visible based on the created viewshed raster.