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How To: Determine if a region subclass has overlapping features

Summary

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

Procedure

This example uses a coverage called CLEANEDCOV, which contains a region subclass called TEMP.

  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.