I am trying to run the Viewshed tool on a DEM in order to produce an above ground level raster - i.e. a raster showing the minimum height a object has to be to be visible. The tool is generating the viewshed raster but is not producing the above ground level raster. There is no error message. I have tried both shapefiles and feature classes for the observer points, and both grids and fgdb rasters for the DEM.
I am running ArcGIS 10.1 build 3143, on Windows 7 64-bit.