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Define NoData areas in a raster using a mask

Question asked by Fred@BA on Mar 20, 2018
Latest reply on Apr 4, 2018 by Dan_Patterson


I have multiple overlapping rasters (DEM) that I want to merge together using "Mosaic to new Raster". One raster has some noisy spots that I want to set to NoData, to be ignored in the final DEM. 

How can I do that using polygons that mask the areas i want to delete? 

The SetNull function is always setting everything BUT the area to NoData when i use an extracted raster as the condition...