I have two shapefiles with thousands of polygons representing the same administrative units at two points in time. In many cases, the polygons from the two shapefiles overlap perfectly; in other cases, they have changed slightly. I am using intersect to calculate the percent of overlap between polygon X in shapefile 1 and polygon X in shapefile 2.
I am trying to figure out how to deal with a special case, in which a polygon has been split neatly into 2 or more parts. The images below illustrate: the original polygon (on the left) has been split into three parts (on the right) but its outside borders have not changed at all.
I would like to do two things:
Identify these cases in ArcMap 10.4.
Record the attributes (FID, etc) of the polygons from image 2 that, combined, comprise the full area of the polygon from image 1.
Since I have many thousands of polygons, doing this manually will not work. I am hoping there is some elegant solution to this problem that I am not aware of. I am most interested in cases where the combination of 2+ polygons in one shapefile completely cover the area of 1 polygon in the other shapefile, down to some arbitrarily small tolerance level.