I have a bunch of polygons (counties) that I need to merge together. They all have various population attributes. I need to be able to selectively merge two counties together and get a single polygon with the combined population totals for the attributes. Is there a way to do this in ArcGIS?
I've tried the Merge tool but while that works for the boundaries, it doesn't work for the adding the two population totals together, you have to pick one or the other. The Dissolve tool seems to operate on all polygons with a single attribute, but there is no unifying attribute that I have that determines which polygons are merged.