I am trying to do a simple measure of the length of seperate sides of a polygon depending on which other polygons it borders (in the image: the dark blue borders of the green polygon to the white area and the red border to the light blue area).
While I'd be keen to hear what tools would be useful for this exercise I have the problem that the polygons come from different sources and do not border exactly (gap) or overlap. I am thus trying to measure the length using the 'Measure' tool in ArcGIS 10.5. This works fine for straight lines but the snapping of the measure tool to curved lines (holding down CTRL) is fairly imprecise. Is there any method to trace outlines similar to the 'Trace' tool or which other method could I use?