I'm using the Census Shape files for state legislative district lines for 2008 and 2012. I want to create a measure that indicates how much these lines have changed between these two time periods (because of redistricting). At first, I thought the best approach was to calculate the percentage of overlap between the two different layers by each district. But, I'm not sure if that's the appropriate way to do it.
Is there a better measure that tells me how similar (or different), a 2012 district is to its 2008 counterpart?