Determine if a region subclass has overlapping features

Summary

This document shows how to determine if a region subclass has overlapping features.

Procedure

1. Use REGIONPOLYCOUNT to create an INFO file that lists the number of region features that overlap each polygon.
   
   

   Code:
   Usage: REGIONPOLYCOUNT <in_cover> <out_info_table>
                          {$ALL|subclass...subclass}
   
   Arc: REGIONPOLYCOUNT cleanedcov overlaps.frq temp

   
   
2. Start Tables, select the INFO file created by REGIONPOLYCOUNT, and use LIST to display item values for the selected records.
   
   

   Code:
   Arc: TABLES
   
   Tables: SELECT overlaps.frq
   
   Tables: LIST
   Record  POLY# TOTAL  TEMP
        1      1     0     0
        2      2     1     1
        3      3     2     2
        4      4     1     1

   
   
3. RESELECT records where TOTAL > 1 to find polygons that are part of multiple region features.
   
   

   Code:
   Tables: RESELECT TOTAL > 1
   1 Records Selected.
   
   Tables: LIST
   Record  POLY# TOTAL  TEMP
        3      3     2     2

   
   

   Note:
   The polygon with an internal number = 3 is part of 2 region features in the TEMP subclass.