I have two maps. One map has some classes and the other one is a raster with no classes. To illustrate, the map with the classes: 0-1, 1-2 and 3-4! The other map is a raster with values from 0-1000.
The maps are overlaying. I want to find out the sum of the second map within the classes of the first map, i.e. what is the sum in the first class 0-1 of the values of the second map?