Floodplain Mapping using HEC-RAS and ArcView GIS. http://www.ce.utexas.edu/stu/tateec. Eric Tate Francisco Olivera David Maidment. Outline. Motivation and Objectives HEC-RAS Hydraulic Model Stream Cross-Section Mapping GIS Data Models 3-D Terrain Modeling Floodplain Mapping.
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One to one relationship established between table records and definition points
Points, lines, and polygons
Typically used for linear feature representation
Digital Elevation Model (DEM)
Square grid cells
Typically used for steady-state spatial modeling and two-dimensional surface representation
Triangular Irregular Network (TIN)
Mesh of equilateral triangles
Used for three-dimensional surface representation and drainage analysis.
Outside Channel: Raster
Inside Channel: Vector
DEM raster to vector conversion
Form polygon bounding the cross-sections
Delete any DEM points falling within the bounding polygon
Problem: elevation differences at the end of the cross-section
Re-sample cross sections to eliminate elevation differences
Build TIN model from re-sampled cross-sections and DEM
Also thanks to Seann Reed and Brian Adams