This is more of a cartographic style question, using QGIS.
I have a dataset that consists of land parcels (previous archaeological projects) as polygons. Multiple projects from different years share the exact same spatial shape.
In composer, I would like to export a map that somehow can show that there are multiple polygons on top of each other, and also include all of the labels.
Currently, I am unable to show more than one shape except by manually decreasing the offset for the top polygon and making it slightly smaller than the one it is on top of.
Is there a better way to do this or to automate this process in the dataset? I think perhaps by writing a script to identify similar parcels, and then add an offset value, so that the map would look like nested differently-colored shapes, but this seems like an awkward work-around.