The NHD for the Trinity River Basin: Appending CUs and Linear Referencing
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Transcript of 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 28th, 2000
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
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
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