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Changes to Viewshed tool between ArcGIS 9.3 and ArcGIS 10.3

Question asked by Dolichonyx on Feb 9, 2016
Latest reply on Feb 22, 2016 by Dan_Patterson

I am updating a toolbox from ArcGIS 9.3 to ArcGIS 10.x. When I run the viewshed tool (in either Spatial Analyst or in 3D analyst), I get a different result than I obtained in ArcGIS 9.3. Any idea what is causing the discrepancy? Is there any documentation regarding the tool change?