I have 4 vector shapefile that I would like to join/merge, without worrying about attributes.
Here are the shapefiles.
I would like to do an union and a spatial dissolve, but everytime I do a dissolve after "PUP" and "PRG" layers union, I got an error about wrong geometries and the output layer is empty.
I validated layers geometry with no errors (at least is what QGIS tells me).
Am I missing out something?