Procedures for constructing ArcInfo coverages and GMT files from 1:100,000 DLG data

           1:100,000-Scale Digital Line Graph (DLG) Data
           Hydrography and Transportation
           US GeoData 
           Optional Format 
      

        Which, for the West Coast, just happens to be in our library as:  
           VK
           597
           .U5
           E278
           CD ROM
           no.12
      

1. Make a directory to store your dlg data (e.g., yosemite):

                mkdir yosemite
                cd    yosemite
             

2. Put the CD in the drive and copy the roads and hydrology zip files from the CD

                cp /cdrom/sec12opt/100k_dlg/yosemite/mz1roads.zip .
                cp /cdrom/sec12opt/100k_dlg/yosemite/mz1hydro.zip .
             

3. Unzip the roads and hydro zip files

                unzip mz1roads
                unzip mz1hydro
             

4. Convert the files from DOS to UNIX format

                dos2unix MZ1RDF01 mz1rdf01
                dos2unix MZ1RDF02 mz1rdf02
                         :
                         :
                dos2unix MZ1RDF08 mz1rdf08
             

   and for hydrology

                dos2unix MZ1HYF01 mz1hyf01
                dos2unix MZ1HYF02 mz1hyf02
                         :
                         :
                dos2unix MZ1HYF08 mz1hyf08
             

5. In ARC construct the coverages (Note: at this point, at the Arc: prompt you can run the AML dlg_to_road-cov.aml. using the road files' prefix (such as mz1rdf0 for the files mz1rdf01 through mz1rdf08) to generate the road coverage. The following steps (through step 10) define the procedures in that AML.

                Arc: dlgarc optional mz1rdf01 rd1
                Arc: dlgarc optional mz1rdf02 rd2
                         :
                         :
                Arc: dlgarc optional mz1rdf08 rd8
             

   and for hydrology

                Arc: dlgarc optional mz1hyf01 rd1
                Arc: dlgarc optional mz1hyf02 rd2
                         :
                         :
                Arc: dlgarc optional mz1hyf08 rd8
             

6. Build the coverages rd1 through rd8

                Arc: build rd1 line
                Arc: build rd2 line
                     :
                     :
                Arc: build rd8 line
             

7. Add the major1 and minor1 fields

                Arc: additem rd1.aat rd1.aat major1 6 6 i
                Arc: additem rd1.aat rd1.aat minor1 6 6 i
                Arc: additem rd2.aat rd2.aat major1 6 6 i
                Arc: additem rd2.aat rd2.aat minor1 6 6 i
                     :
                     :
             

8. Build a relate (this relate must be re-built for rd2, rd3, etc.)

                Arc: relate add
                Relation Name: rel_rd1
                Table Identifier: rd1.acode
                Database Name: info
                INFO Item: rd1-id
                Relate Column: rd1-id
                Relate Type: linear
                Relate Access: ro
   
                Relate Name: rel_rd2
                     :
                     :
             

9. In Tables move the major1 and minor1 attributes to the .aat file

                Arc: tables
                Enter Command: sel rd1.aat
                Enter Command: calc major1 = rel_rd1//major1
                Enter Command: calc minor1 = rel_rd1//minor1
                Enter Command: sel rd2.aat
                Enter Command: calc major1 = rel_rd2//major1
                Enter Command: calc minor1 = rel_rd2//minor1
                     :
                     :
                Enter Command: quit
             

10. Append the coverages into the coverage rd

                 Arc: append rd line all
                 Enter the 1st coverage: rd1
                 Enter the 2nd coverage: rd2
                 Enter the 3rd coverage: rd3
                 Enter the 4th coverage: rd4
                 Enter the 5th coverage: rd5
                 Enter the 6th coverage: rd6
                 Enter the 7th coverage: rd7
                 Enter the 8th coverage: rd8
                 Enter the 9th coverage: end
              

11. Project the appended rd coverage if desired (e.g., UTM to Geographic using the projection file utm11_to_geo.prj).

                 Arc: project cover rd rd_ll utm11_to_geo.prj
              

12. Convert the rd_ll coverage to a series of GMT-formatted files. At the Arc: prompt run the AML dlg-rd-cov_to_gmt.aml on the rd_ll coverage.

                 Arc: &r dlg-rd-cov_to_gmt rd_ll
              

    
    

13. Run a similar procedure to generate hydrology coverages and GMT-formatted files if necessary.
    

    Use the AML dlg_to_hydro-cov.aml, and the hydrology files' prefix (such as mz1hyf0 for the files mz1hyf01 through mz1hyf08) to generate the hydrology coverage.

                 Arc: &r dlg_to_hydro-cov.aml mz1hyf0
              

    Then convert the coverage to GMT-formatted files dlg-hy-cov_to_gmt using the resultant hy_ll coverage.

                 Arc: &r dlg-hy-cov_to_gmt hy_ll
              

dlg_prim.xy
dlg_sec.xy
dlg_road.xy
dlg_trl.xy

and a series of GMT-formatted hydrology files titled:

dlg_str.xy
dlg_stri.xy
dlg_shor.xy
dlg_aqu.xy

11/08/99