Day 1, April 14 - Posters

Start Date

14-4-2020 1:00 PM

End Date

14-4-2020 3:00 PM

Publisher

University of Tennessee at Chattanooga

Place of Publication

Chattanooga (Tenn.)

Abstract

A seamless digital elevation model (DEM) of Chattanooga, TN containing the Tennessee River bathymetry was needed for a hydrodynamic modeling project. Geospatial bathymetric data for the Tennessee River was not available in digital form. Depth contour maps downloadable as a PDF files were the only readily available data. A strategy was thus developed to create a GIS of the contour maps and “burn in” this bathymetry data into USGS DEMs which lack information on river depth. Two PDFs were digitized pertained to “Nickajack Lake” and “Chickamauga Lake.” Each PDF contained multiple pages of maps that split up bathymetric data for different sections of the river. Each page was georeferenced using the software ERDAS Imagine. Georeferenced maps were imported into ArcGIS Pro and contour lines were traced as point shapefiles with stored depth data. A polygon of the Tennessee River was created covering the extent of the point depth data to be used as a mask for geoprocessing. Depth point data were converted to raster through the Topo to Raster spatial interpolation tool for burning into the DEM. The Raster Calculator tool was then used to stitch the DEMs together. The resulting raster seamlessly combines the Tennessee River bathymetry data with the original USGS DEM and can be used for hydrodynamic modeling.

Date

4-14-2020

Document Type

posters

Language

English

Rights

http://rightsstatements.org/vocab/InC/1.0/

License

http://creativecommons.org/licenses/by/4.0/

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Apr 14th, 1:00 PM Apr 14th, 3:00 PM

Bathymetric digital elevation model for the Tennessee River

A seamless digital elevation model (DEM) of Chattanooga, TN containing the Tennessee River bathymetry was needed for a hydrodynamic modeling project. Geospatial bathymetric data for the Tennessee River was not available in digital form. Depth contour maps downloadable as a PDF files were the only readily available data. A strategy was thus developed to create a GIS of the contour maps and “burn in” this bathymetry data into USGS DEMs which lack information on river depth. Two PDFs were digitized pertained to “Nickajack Lake” and “Chickamauga Lake.” Each PDF contained multiple pages of maps that split up bathymetric data for different sections of the river. Each page was georeferenced using the software ERDAS Imagine. Georeferenced maps were imported into ArcGIS Pro and contour lines were traced as point shapefiles with stored depth data. A polygon of the Tennessee River was created covering the extent of the point depth data to be used as a mask for geoprocessing. Depth point data were converted to raster through the Topo to Raster spatial interpolation tool for burning into the DEM. The Raster Calculator tool was then used to stitch the DEMs together. The resulting raster seamlessly combines the Tennessee River bathymetry data with the original USGS DEM and can be used for hydrodynamic modeling.