NDLI: Comparison and validation of the recent freely-available ASTER-GDEM ver 1 , SRTM ver 4 . 1 and GEODATA DEM-9 S ver 3 digital elevation models over Australia Running title : Comparison and validation of recent DEMs over Australia

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Comparison and validation of the recent freely-available ASTER-GDEM ver 1 , SRTM ver 4 . 1 and GEODATA DEM-9 S ver 3 digital elevation models over Australia Running title : Comparison and validation of recent DEMs over Australia

Content Provider	Semantic Scholar
Author	Hirt, Christian Featherstone, Megan E.
Copyright Year	2013
Abstract	Western Australian Centre for Geodesy & The Institute for Geoscience Research, Curtin University of Technology, GPO Box U1987, Perth WA 6845, Australia, * Tel: (08) 9266 2218; Fax: (08) 9266 2703; Email: C.Hirt@curtin.edu.au 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 This study investigates the quality (in terms of elevation accuracy and systematic errors) of three recent publicly available elevation model data sets over Australia: the 9 arc second national GEODATA DEM9S ver3 from Geoscience Australia and the Australian National University (ANU), the 3 arc second SRTM ver4.1 from CGIAR-CSI, and the 1 arc second ASTER-GDEM ver1 from NASA/METI. The main features of these data sets are reported from a geodetic point of view. Comparison at about 1 billion locations identifies artefacts (e.g., residual cloud patterns and stripe effects) in ASTER. For DEM-9S, the comparisons against the space-collected SRTM and ASTER models demonstrate that signal omission (due to the ~270 m spacing) may cause errors of the order of 100-200 m in some rugged areas of Australia. Based on a set of geodetic ground control points (GCPs) over Western Australia, the vertical accuracy of DEM-9S is ~9 m, SRTM ~6 m and ASTER ~15 m. However, these values vary as a function of the terrain type and shape. Thus, CGIAR-CSI SRTM ver4.1 may represent a viable alternative to DEM-9S for some applications. While ASTER GDEM has an unprecedented horizontal resolution of ~30m, systematic errors present in this research-grade version of the ASTER GDEM ver1 will impede its immediate use for some applications.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://mediatum.ub.tum.de/doc/1368875/264850.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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