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    Comparison of digital elevation models over Australia and external validation using ERS-1 satellite radar altimetry

    Access Status
    Fulltext not available
    Authors
    Featherstone, Will
    Berry, P.
    Johnson, C.
    Kirby, Jonathan
    Date
    2003
    Type
    Journal Article
    
    Metadata
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    Citation
    Hilton, R.D. and Featherstone, W.E. and Berry, P.A.M. and Johnson, C.P.D. and Kirby, J.F. 2003. Comparison of digital elevation models over Australia and external validation using ERS-1 satellite radar altimetry. Australian Journal of Earth Sciences. 50 (2): pp. 157-168.
    Source Title
    Australian Journal of Earth Sciences
    DOI
    10.1046/j.1440-0952.2003.00982.x
    ISSN
    08120099
    Faculty
    Department of Spatial Sciences
    Faculty of Science and Engineering
    The Western Australian School of Mines
    URI
    http://hdl.handle.net/20.500.11937/12829
    Collection
    • Curtin Research Publications
    Abstract

    Digital elevation models (DEMs) are widely relied upon as representations of the Earth's topographic morphology. The most widely used global DEMs available are ETOPO5, TerrainBase and JGP95E at a 5-arc-minute spatial resolution, and the GTOPO30 and GLOBE (version 1) global DEMs at a 30-arcsecond spatial resolution. This paper presents the results of intercomparisons of these global DEMs over Australia, and with the GEODATA 9-arc-second DEM (version 1) of Australia. These DEMs were also compared to an independently produced, altimeter-derived orthometric height database. This allows not only a totally independent assessment of the quality of these different DEMs over Australia, but also an insight into the ERS-1 radar altimeter's ability to measure orthometric heights on land. The results of all these comparisons reveal large differences among the DEMs, with the greatest difference between JGP95E and ETOPO5 (mean 49 m, standard deviation 274 m). The comparison with the altimeter derived database shows good agreement with the version 1 GEODATA DEM (mean 2 m, standard deviation 27 m), thus demonstrating that the altimeter is a viable method for quality assessment of DEMs in lowland regions. A further conclusion is that the representation of the Australian land surface in both the JGP95E and TerrainBase global DEMs is more accurate than the higher resolution GLOBE (version 1) global DEM, even though JGP95E displays a disparity along the 140-degree E meridian because of the different data sources used in its construction.

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