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I need to create a mask of NoData pixels from an elevation raster dataset. ArcGIS directly recognizes the NoData values as such, so I don't see an option to address them e.g. in the Raster Calculator to create a simple raster Mask where 1 stands for the data gaps in my original elevation raster.

Could anyone help me with a default method or at least a flexible workaround for this?

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Another way is to use an environmental parameter as

arcpy.env.nodata = 'MINIMUM' or any other parameter.

Under ArcGIS 10.3

Under ArcGIS Pro < Not tested

To setup Environmental parameters for nodata

ArcMap 10.3 > Under Raster Storage

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Just found out that there is a tool called "Is Null" for this exact purpose. Problem solved.

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