The Use of GIS to Manage LIDAR Elevation Data and Facilitate Integration with the MIKE21 Two-Dimensional Hydraulic Model in a Flood Inundation Decision Support System

Author: Thomas Joseph Heinzer
Organization: U.S. Bureau of Reclamation

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This paper describes the methods and results of an investigation into the use of LIDAR-derived elevation models as terrain input to the MIKE21 hydrodynamic model. The purpose of this study is to implement LIDAR remote sensing technology in a GIS-interfaced inundation modeling environment. The feasibility of simulating canal breaches is explored in areas near residential development. Ortho-rectified photographic images are referenced to eliminate LIDAR signals falling within building footprints and a "bare surface" elevation model is interpolated. The buildings are subsequently re-extruded in the raster domain, utilizing a GIS to provide realistic structural definitions.