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One way to do this would be to add an attribute to your polygon layer, say "VALUE", and assign it numeric value of 1000 or more. Then convert the polygon layer to a raster. In arcpy using the spatial analyst module these rasters can be multiplied easily. elevRast = arcpy.Raster("path/elevrast") polyRast = arcpy.Raster("path/polygonraster") resultRast = ...
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