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    Comparison of free high resolution digital elevation data sets (ASTER GDEM2, SRTM v2.1/v4.1) and validation against accurate heights from the Australian National Gravity Database

    200751_200751.pdf (1.346Mb)
    Access Status
    Open access
    Authors
    Rexer, Moritz
    Hirt, Christian
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Rexer, M. and Hirt, C. 2014. Comparison of free high resolution digital elevation data sets (ASTER GDEM2, SRTM v2.1/v4.1) and validation against accurate heights from the Australian National Gravity Database. Australian Journal of Earth Sciences. 61 (2): pp. 213-226.
    Source Title
    Australian Journal of Earth Sciences
    DOI
    10.1080/08120099.2014.884983
    ISSN
    0812-0099
    School
    Department of Spatial Sciences
    Remarks

    This is an Author's Accepted Manuscript of an article published in the Australian Journal of Earth Sciences, 2014, copyright Taylor & Francis, available online at: <a href="http://www.tandfonline.com/">http://www.tandfonline.com/</a>. doi: 10.1080/08120099.2014.884983

    This research was supported by the Australian Research Council (Grant DP120102441)

    URI
    http://hdl.handle.net/20.500.11937/38264
    Collection
    • Curtin Research Publications
    Abstract

    Today, several global digital elevation models (DEMs) are freely available on the web. This study compares and evaluates the latest release of the Advanced Spaceborne Thermal Emission Reflectometer DEM (ASTER GDEM2) and two DEMs based on the Shuttle Radar Topography Mission (SRTM) as released by the United States Geological Survey (SRTM3 USGS version 2.1) and by the Consortium for Spatial Information (SRTM CGIAR-CSI version 4.1) over the Australian continent. The comparison generally shows a very good agreement between both SRTM DEMs; however, data voids contained in the USGS model over steep topographic relief are filled in the CGIAR-CSI model. ASTER GDEM2 has a northeast- to southwest-aligned striping error at the 10 m level and shows an average height bias of –5 m relative to SRTM models. The root-mean square (RMS) height error obtained from the differences between ASTER GDEM2 and SRTM over Australia is found to be around 9.5 m. An external validation of the models with over 228 000 accurate station heights from the Australian National Gravity Database allows estimating each models’ elevation accuracies over Australia: ASTER GDEM2 ~ 8.5 m, SRTM3 USGS ~ 6 m, SRTM CGIAR-CSI ~ 4.5 m (RMS). In addition, the dependence of the DEM accuracy on terrain type and land cover is analysed. Applying a cross-correlation image co-registration technique to 529 1 × 1 degree tiles and 138 2 × 2 degree tiles reveals a mean relative shift of ASTER GDEM2 compared with SRTM of –0.007 and –0.042 arc-seconds in north–south and –0.100 and –0.136 arc-seconds in east–west direction over Australia, respectively.

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