Quantifying linear dune morphology: Examples with SRTM, GDEM, and multibeam bathymetry

TitleQuantifying linear dune morphology: Examples with SRTM, GDEM, and multibeam bathymetry
Publication TypeConference Paper
Year of Publication2011
AuthorsGuth, P.
Secondary AuthorsHengl, T., I.  S. Evans, J.  P. Wilson, and M. Gould
Conference NameGeomorphometry 2011
Conference LocationRedlands, CA
KeywordsASTER GDEM, dunes, multibeam bathymetry, srtm
Abstract

An automated routine can extract dune crest locations, heights, and wavelength from digital elevation models. The algorithm extracts the fabric from the DEM, draws profiles perpendicular to the crests, and computes statistics from the profiles. Results from the SRTM and ASTER GDEM produce similar results for dunes with heights from 20-100 m and wavelengths of 900-2200 m, and multibeam bathymetry can extract 0.5 m high megaripples with a wavelength of 25 m. In desert regions the ASTER GDEM appears to have few of the anomalies that detract from its performance elsewhere, and provides an improvement over the results with SRTM.

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