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How to include empty classes in reduce.Region in Google Earth Engine?

I use the .reduceRegion({reducer: ee.Reducer.sum().group(1)}) option to get the sum of the areas in my image per class. The only problem is that some classes are not present in certain regions. … The output of this .reduceRegion leaves out those classes, whereas I would like the output to still include the class and says that the sum is 0. Does anyone know how to get this? …
justin fiedler's user avatar