I would very much appreciate some help in working out how to create a particular type of layer/map.
I have a polygon layer which represents spatial coverage of three different categories. At the moment these categories are represented as separate polygons. In certain areas the different categories overlap each other, so I want to create a map which represents areas where there are more than one category. This would mean that the final map should show seven different spatial classifications, as shown below:
Category A and B
Category A and C
Category B and C
Category A, B and C
I am stuck on working out how to create this sort of map/layer. If anyone could point me in the right direction so I at least know where to begin then that would be great. Sorry if I have not explained it very well, please ask if you need anymore information.