Notes

Outline

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

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

Study Area: The Trinity River Basin

NHD Workspaces  Have a Complex Integrated Data Structure  3 Route Systems     3 Region Systems

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

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

Append Results

Slide 8

Comparison of Appended & Unappended Cus

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

Measures on the NHD

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

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

Example Results on the Trinity

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.