I have three drive-time analysis boundaries/polygons created and they all overlap significantly. I need to be able to merge them into one single one so that I can determine the collective population captured in these catchments together. I then need to see how much this overlaps with a fourth drive-time catchment.
When I merge the layers and run a "summarise within" analysis to determine the population for the first three together, I keep ending up with three quoted populations as though the polygons are still seperate. When I run a dissolve function, I get lots of quoted populations rather than 1 collective population, so I am unable to latter map this over the 4th catchment to determine the overlap.
I use arcGIS pro and arcGIS Online and have had no luck after days and days of trying.
Thank you!