Adding additional Class to Landuse Map in ArcGIS Pro

Question

I'm using ArcGIS Pro.

I have a landuse raster with 8 unique classes.

I have another raster with 1 unique class which I would like to go over my main raster (replacing everything on top of it) to become the 9th class

Answer 1

Use the Raster Calculator tool with the Con and IsNull functions to set the output raster to the existing landuse value where proposed landuse is null, otherwise set to 9.

Note: make sure you set the tool environment processing extent and snap raster if the rasters have different dimensions.

Con(IsNull("PROPOSED"), "LANDUSE", 9)