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Modeling Floodplain Inundation Using an Integrated GIS with Radar and Optical Remote Sensing

Citation

Townsend, Philip A. & Walsh, Stephen J. (1998). Modeling Floodplain Inundation Using an Integrated GIS with Radar and Optical Remote Sensing. Geomorphology, 21(3-4), 295-312.

Abstract

Synthetic aperture radar images from multitemporal L-band JERS-1 and C-band ERS-1 satellites, a Landsat Thematic Mapper (TM) time-series, and GIS coverages were used in an integrative approach to model the potential of flood inundation within the lower Roanoke River floodplain, North Carolina. A digital elevation model (DEM) with one-meter vertical resolution was developed for the region from scan-digitized mylar separates of contour lines on USGS 7.5-min quadrangles. Several models representing potential wetness and potential flood inundation were generated from the DEMs using both raster (grid) and vector (network) analyses. The potential inundation surfaces were derived from regression models that related known flood elevations to river position and floodplain location. The GIS models were assessed by comparison to classifications of flood change-detection achieved through the radar data. Statistical results indicate that the GIS-derived models successfully identified flooded areas as mapped by the radar change-detections. Further, statistical tests assessed the ability of individual radar and optical (Landsat TM) images to discriminate flooding as predicted by the GIS models. Both JERS-1 and ERS-1 images identified areas of inundation at different flood levels.

URL

https://doi.org/10.1016/S0169-555X(97)00069-X

Reference Type

Journal Article

Journal Title

Geomorphology

Author(s)

Townsend, Philip A.
Walsh, Stephen J.

Year Published

1998

Volume Number

21

Issue Number

3-4

Pages

295-312

Reference ID

995