Guidance on Generating Hydrologic Model Input from a Triangulated Irregular Network (TIN) Using a Curvature Based Filtering Technique to Extract TIN Vertices from Gridded Digital Elevation Models
Guidance on Generating Hydrologic Model Input from a Triangulated Irregular Network (TIN) Using a Curvature Based Filtering Technique to Extract TIN Vertices from Gridded Digital Elevation Models
- New search for: Jorgeson, Jeffrey D.
- New search for: Jorgeson, Jeffrey D.
- New search for: Mississippi State University. Department of Civil Engineering.
Extracting input data for hydrologic modeling from triangulated irregular networks (TIN's) is studied. A technique is analyzed that selects points from gridded elevation data for TIN vertices. Elevation points in the grid are filtered out based upon a user defined threshold, with data removal ranging between 20 and 95 percent. Guidance is provided on appropriate filtering thresholds when input data for hydrologic modeling are extracted from the TIN's. The following procedure was used: (A.) Gridded elevation data for three watersheds representing different terrains were filtered at several thresholds and TIN's were generated from the filtered data. (B.) Watershed geometric parameters were computed from the TIN's, and parameter differences vrsus the amount of data filtered were determined. (C.) The geometric parameters were used as input for HEC-1, and differences in hydrographs versus the amount of data fitered were documented. Removal of approximately 80 percent of the elevation grid points showed no significant changes in discharge hydrographs.
Document information
Guidance on Generating Hydrologic Model Input from a Triangulated Irregular Network (TIN) Using a Curvature Based Filtering Technique to Extract TIN Vertices from Gridded Digital Elevation Models
Technical Report ; HL-95-7
1995
5406561
Report
Electronic Resource
English
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