I am trying to compare the 2000 Census county boundaries with the 2010 Census county boundaries. Each county is uniquely identified in a given year by a FIPS code and I want to compare if the polygon represented by given FIPS code z in 2000 is different from the polygon represented by the same code (z) in 2010. By different I mean any change to the geometry, regardless of whether it modifies the area of the polygon.
My ideal output is a table/spreadsheet with two columns - one containing the 2000 Census FIPs codes and the other indicating some way of identifying if a that code references different geometries/polygons in the two years. This indicator could be a boole (TRUE/FALSE), a binary indicator (1/0), some continuous variable, or any other indicator.
I am looking for a solution in either R or QGIS.
- This post is similar but isn't concerned with geometry while I am concerned with geometry: Polygon overlay, calculating changes, in QGIS?
- It looks like this would provide the solution: http://postgis.net/docs/ST_Equals.html, but I am preferably looking for a solution in QGIS or R.
- Something somewhat related is this example in ArcGIS: Finding differences between shapefiles using ArcGIS for Desktop?
- Also similar but using ArcGIS: Finding differences between shapefiles using ArcGIS for Desktop?