I am working in urbanism and I have a number of polygons that represent perimeters where certain "programs of revaluation" have been carried out.
However, as can be seen on the map below, over time, these perimeters have overlapped. Now I would like to create a new map, expressing how many perimeters are overlapping where. So this would mean, asking QGIS to create new zones based on the number of overlapping original polygons.
How could I do this? I know about the existence of heat maps but I am not sure this is what I need? Do heat maps only seem to work on point layers?
I am working in QGIS 3.4.2 Madeira on a MacBook