To classify or group the features based on the NEAR_DIST values. You can try the following approaches:
Approach 1 �?? using Dissolve to group features:
1. Run Dissolve tool with the NEAR_DIST as the Dissolve Field and the �??Create multipart features�?� box checked. This should make all features with the same NEAR_DIST value into one multipart feature. The resulting FIDs would be the unique IDs you need.
2. Then run Multipart To Singlepart tool to break the multipart features into singlepart, each carries the dissolved FID from above. I hope that polygons with holes won�??t be an issue (I am not sure if the inner hole will come out a filled polygon; please test).
Approach 2 �?? using Frequency to group features:
1. Run Add Field tool to add a field, e.g. ConID (for connectivity IDs), for storing the unique IDs you will get later.
2. Run Frequency tool with the NEAR_DIST as the Frequency Field. The resulting table contains ObjectID, Frequency (count), and NEAR_DIST fields. The ObjectIDs of this table would be the unique IDs you need.
3. Then run Add Join (or go to the input layer and add a join) to join the input table with the Frequency table via the NEAR_DIST as the join field. Now you should see the ObjectIDs from the frequency table above.
4. Run Calculate Field tool to calculate the ConID by the frequency ObjectID.
Note: I am not sure if any of the above approaches will end up the unique IDs in the same ascending order as the near distance. Hope that doesn�??t matter to your analysis.
Hope that works for you.
