Create a polygon coverage from DFAD data

Summary

Instructions provided list the sequence of steps to convert a DFAD file to a polygon coverage.

Procedure

1. Convert the DFAD file to a new ArcInfo workspace.
   
   

   Code:
   Arc: precision double double
   
   Usage: DFADARC <in_dfad_file> <out_workspace>
   Arc: dfadarc dfad1 tempwork
   
   Data Set #1...
   DFAD Level 1-C Manuscript
   WAG (WAC) number: 405  Series 200 cell: 22  Series 50 cell: 14
   Data Set reference number: G18 013   Edition: 01
   Compilation date:
   Geographic extent: (00 00 00.0 N, 000 00 00.0 E) SW
                      (01 00 00.0 N, 001 00 00.0 E) NE
   Security Classification: UNCLASSIFIED   LIMITED DISTRIBUTION
   
   End of DFAD file.
   Done converting dfad1.

   
   
2. Change workspaces and list the coverages.
   
   

   Code:
   Arc: workspace tempwork
   Arc: lc
    Workspace:        C:\TESTING\DFAD\TEMPWORK
   
    Available Coverages
    -------------------
     DS01L             DS01P

   
   
3. The chain of arcs which formed enclosed area features in the original DFAD file will be coded with unique values stored in the <cover>-ID item in the AAT.
   
   

   Code:
   Arc: items ds01p.aat
   
   COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  
       1  FNODE#                 4     5     B      - 
       5  TNODE#                 4     5     B      - 
       9  LPOLY#                 4     5     B      - 
      13  RPOLY#                 4     5     B      - 
      17  LENGTH                 8    18     F      5 
      25  DS01P#                 4     5     B      - 
      29  DS01P-ID               4     5     B      - 

   
   
4. Use REGIONCLASS to create region features from the closed chains of arcs. The new region features will be stored in a region subclass and the original <cover>-ID values will be stored in the FACODE item in the region attribute table.
   
   

   Code:
   Usage: REGIONCLASS <in_cover> {out_cover} <out_subclass>
          {in_region_item} {out_region_item} {selection_file}
          {MULTIRING | SINGLERING}
   
   Arc: regionclass ds01p ds01reg land ds01p-id facode
   (Re)building nodes...
   Grouping arcs for regions...
   3 preliminary region(s) appended to subclass land.

   
   
5. CLEAN the coverage to create polygon and region topology.
   
   

   Code:
   Usage: CLEAN <in_cover> {out_cover} {dangle_length} 
          {fuzzy_tolerance} {POLY | LINE}
   
   Arc: clean ds01reg # 0.01 0.01 poly
   Cleaning C:\TESTING\DFAD\TEMPWORK\DS01REG
    Checking regions...
    Sorting...
    Intersecting...
    Assembling polygons...
    Re-building AAT...

   
   
6. Join the <cover>.PCODE to the region attribute table based on the FACODE item which exists in both tables.
   
   

   Code:
   Usage: JOINITEM <in_info_file> <join_info_file> 
          <out_info_file> <relate_item> {start_item} 
          {LINEAR | ORDERED | LINK}
   Arc: joinitem ds01reg.patland ds01reg.pcode ds01reg.patland 
        facode facode