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The NHD for the Trinity River Basin: Appending CUs and Linear Referencing

The NHD for the Trinity River Basin: Appending CUs and Linear Referencing. Kristina Schneider. November 28 th , 2000. Introduction. Study Area & Focus Area NHD Workspaces The Append Aml Linear Referencing Summary. Study Area: The Trinity River Basin. Focus Area. Spatial Data Set.

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The NHD for the Trinity River Basin: Appending CUs and Linear Referencing

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  1. The NHD for the Trinity River Basin: Appending CUs and Linear Referencing Kristina Schneider November 28th, 2000

  2. Introduction • Study Area & Focus Area • NHD Workspaces • The Append Aml • Linear Referencing • Summary

  3. Study Area: The Trinity River Basin Focus Area

  4. Spatial Data Set Contents Feature Attribute Table Coverage: NHD Route DRAIN Network Element Theme NHD.RATDRAIN Route RCH Transport and CoastlineReach Theme NHD.RATRCH Route LM Line Landmark Theme NHD.RATLM Region WB Waterbody Theme NHD.PATWB Region RCH Waterbody Reach Theme NHD.PATRCH Region LM Area Landmark Theme NHD.PATLM Nodes NHD underpass features exist on some nodes NHD.NAT Coverage: NHDPT Points Point Landmark Theme NHDPT.PAT Coverage: NHDDUU Region.dom Digital Update Unit Theme NHDDUU.PATDOM NHD Workspaces • Have a Complex Integrated Data Structure • 3 Route Systems 3 Region Systems

  5. The Append Aml • What is Aml? • Arc Marco Language • What is the purpose of the Append Aml? • Integration of Adjacent NHD Workspaces • Removal of Duplicate Information

  6. The Append Aml • How do we use Append? • Verify Data has been unzipped correctly • Use the program &run append_nhd area_test batch huc_input.txt

  7. Append Results Is there a difference between Appended Networks and Unappended Networks?

  8. Comparison of Appended & Unappended Cus

  9. Linear Addressing • Types of General Linear Addressing • Absolute Addressing • Relative Addressing • Linear Addressing on the NHD • 3 Route systems but only 1 Linear Referencing system Reach Routes

  10. Measures on the NHD

  11. Where are we on the River? • Use the Editor toolbar in ArcInfo 8.1 • Click on the desired reach and right click onto Properties

  12. Where are we on the River? • Decide on which points to reference. • Create a table in ArcCatolog for the points. • In ArcMap enter in m-values already found using the Editor. • Create an Event Table and Display the Route Events

  13. Example Results on the Trinity The Route Events are located at the same measures as the Originals.

  14. Summary • Successfully implemented the Append Aml on the focus area of the NHD. • Compared Appended and Unappended Networks. • Explored Linear Addressing on the NHD. • Verified a methodology to create Route Events from the NHD point Coverage.

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