The NHD for the Trinity River Basin: Appending

CUs and Linear Referencing

Kristina Schneider

November 28th, 2000

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

Study Area: The Trinity River Basin

Focus Area

NHD Workspaces

Have a Complex Integrated Data Structure

3 Route Systems 3 Region Systems

Spatial Data Set Contents Feature Attribute Table

Coverage: NHD

Route DRAIN Network Element Theme NHD.RATDRAIN

Route RCH Transport and Coastline Reach 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

The Append Aml

What is Aml? Arc Marco Language

What is the purpose of the Append Aml?

Integration of Adjacent NHD WorkspacesRemoval of Duplicate Information

How do we use Append?Verify Data has been unzipped correctlyUse the program

&run append_nhd area_test batch huc_input.txt

The Append Aml

Append Results

Is there a difference between Appended

Networks and Unappended Networks?

Comparison of Appended & Unappended Cus

Appended CUs

Unappend CUs

Attributes 3930 3932

Network 3930 3932

Traced 3830 3831

Linear Addressing Types of General Linear Addressing

Absolute Addressing

Relative Addressing

Linear Addressing on the NHD3 Route systems but only 1 Linear Referencing system Reach Routes

Measures on the NHD

Use the Editor toolbar in ArcInfo 8.1

Click on the desired reach and right click onto Properties

Where are we on the River?

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

The Route Events are located at the same measures as the Originals.

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.