Height Above Nearest Drainage in Houston and Galveston

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Presentation transcript:

Height Above Nearest Drainage in Houston and Galveston Jeff Zheng GIS Water Resources

HAND - Houston

GeoNet Open access computational tool Can be applied to different types of terrain: Natural areas/catchments Relatively flat topography and some artificial features Urban areas

Project Challenges Large datasets (~60 GB – Houston area) First time experience (so lack of) Need to analyze data at much smaller scales Administrative access in general Downloading/installing software Access to licensed commercial software Mapping toolbox (MATLAB) Learning curve Become some-what competent with MATLAB and Python

Next Steps Produce drainage networks for several more small scale catchments (in shape file) Overlay with the 3-meter DEM and compare with NHD-Plus flowlines Create HAND raster files for the small scale catchments Compare with original HAND (containing 3-meter NED and high resolution flowlines) Look into the Modified HAND (based on stream order) Developed by McGehee, Li, and Poston at the National Water Center (Summer Institute) Analyze non-uniform inundation while also account for backwater effects

Modified HAND

References Sangireddy, H.*, C.P. Stark, A. Kladzyk*, Passalacqua, P. (2016). GeoNet: An open source software for the automatic and objective extraction of channel heads, channel network, and channel morphology from high resolution topography data, Environmental Modeling and Software, 83, 58-73, doi:10.1016/j.envsoft.2016.04.026.

HAPPY THURSDAY!