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Gapped or Branched Attribute Check. Gapped or branched attribute tool The gapped or branched attribute tool is a two part process. It checks NHDflowline features for gaps or branching in GNIS Names by using GNIS ID’s.
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Gapped or Branched Attribute Check
Gapped or branched attribute tool The gapped or branched attribute tool is a two part process. It checks NHDflowline features for gaps or branching in GNIS Names by using GNIS ID’s. The second part checks NHDFlowline features for gaps or branching in reachcodes.
ArcToolbox: NHD Tools Double click on gapped_or_branched_attribute_check
Script dialog box: Successful completion Close Output – Same folder as your pgdb “1d_gob_gnis_id.dat” and “errnodes” Note: If you do not have any errors the table will not be created Note: You will not be able to see the .Dat file in Windows Explorer.
Make GNIS fixes before running ReachCode check. When you run ReachCode check it will overwrite the GNIS errnode coverage.
ArcMap: Add Data Files errnodes and 1d_gob_gnis_id.dat are in same folder as your pgdb Add
Right click on 1d_gob_gnis_id.dat Joins and Relates Relate
Right click on 1d_gob_gnis_id.dat Open attribute table
Select record Options, Related Tables, 1d_gob_gnis_id:NHDFlowline
Change point symbology to size 15 on errnodes point file Double click on point symbol
Zoom to selected records In this case the GNIS ID (and GNIS Name) is disconnected
Example: Error from 1d_gob_gnis_id table…….. In this case the GNIS ID (and GNIS Name) is branched
ArcToolbox: NHD Tools Double click on gapped_or_branched_attribute_check
Script dialog box: Successful completion Output – Same folder as your pgdb “1d_gob_reachcode.dat” and “errnodes” Close Note: If you do not have any errors the table will not be created
Right click on 1d_gob_reachcode.dat Joins and Relates Relate
Right click on 1d_gob_reachcode.dat Open attribute table
Select record Options, Related Tables, 1d_gob_reachcode:NHDFlowline
Zoom to selected records In this case the ReachCode is disconnected