AnsweredAssumed Answered

How to determine the changes between two polygon shapefiles of similar data

Question asked by WhitneyNewcomb on Nov 8, 2017
Latest reply on Jun 4, 2019 by tkowal

The city I work for gets its parcel data from the county once a month so we have several years of almost the same data. I want to be able to determine where changes occur between every new month. So what are the changes between September to October, October to November, etc. And by changes I mean any change in geometry (like parcel splits or merges) or changes in attributes (especially changes in ownership).


I've contacted ESRI about this and they weren't able to do a whole lot for me. 

Here's what I've tried so far:

I am able to find changes in geometry by using the Select by Location: Identical features and inverting the selection. 

This works fine but does not get me changes in attributes.

I would use the Feature Compare tool but this does not work as it requires the same number of rows in both tables - which I don't have. 


I also found an old arcgisscripting tool and converted it to arcpy and it worked with point datasets (but at a certain point in time the County changed how they did their parcel data and went to polygons only which the script does not work with).


So I'm at a loss for what to do now.


Does anyone have any advice for me?


Please let me know if there's any info I can give to help you help me.


-Whitney Newcomb