I would like to align census tabulation blocks from the 2000 and 2010 censuses. I have the relationship file, so I know which blocks are suppose to the same and which were split or consolidated. However, when overladed, the geometries don’t match up. More over, the number of points can be different. (The Census 2010 blocks have more detail in them.)
(Red is the 2000 census boundaries, black are the 2010 boundaries)
I was thinking that the bounding boxes of the blocks that should be “identical” could be used as a better (but still rough?) proxy and GCP points could be generated for the bounding boxes and used to better align the blocks. The problem is that I’m not sure what to do once I were to create said bounding boxes.
I’m also open to any other methods of trying to align these geometries.
(For reference, I’m attempting to compute the % overlap for the blocks so that I can do something similar to the Brown University Longitudinal Tract Database and project the 2000 data into the 2010 geometries.)
Unfortunately, the ids for each block changed significantly. (Although, for posterity, it seems as if the tract ids were better preserved, probably since there were many fewer changes made.)