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| Titel |
The New Global Digital Elevation Model : TanDEM-X DEM and its Final Performance |
| VerfasserIn |
Carolina Gonzalez, Paola Rizzoli, Michele Martone, Christopher Wecklich, Daniela Borla Tridon, Markus Bachmann, Thomas Fritz, Birgit Wessel, Gerhard Krieger, Manfred Zink |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250145081
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| Publikation (Nr.) |
 EGU/EGU2017-8978.pdf |
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| Zusammenfassung |
| Digital elevation models (DEMs) have become widely used in many scientific and
commercial applications and there are several local products have been developed in the last
years. They provide a representation of the topographic features of the landscape. The
importance of them is known and valued in every geoscience field, but they have also vast use
in navigation and in other commercial areas. The main goal of the TanDEM-X (TerraSARX
add-on for Digital Elevation Measurements) mission is the generation of a global DEM,
homogeneous in quality with unprecedented global accuracy and resolution, which has been
completed in mid-2016.
For over four years, the almost identical satellites TerraSAR-X and TanDEM-X acquired
single-pass interferometric SAR image pairs, from which is it possible to derive the
topographic height by unwrapping the interferometric phase, unaffected by temporal
decorrelation. Both satellites have been flying in close formation with a flexible geometric
configuration. An optimized acquisition strategy aimed at achieving an absolute vertical
accuracy much better than 10 meters and a relative vertical accuracy of 2 m and 4 m for flat
and steep terrain, respectively, within a horizontal raster of 12 m x 12 m, which slightly
varies depending on the geographic latitude.
In this paper, we assess the performance of the global Tandem-X DEM, characterized in
terms of relative and absolute vertical accuracy. The coverage statistics are also discussed in
comparison to the previous almost global but with lower resolution DEM provided by the
Shuttle Radar Topography Mission (SRTM).
The exceptional quality of the global DEM is confirmed by the obtained results and the
global TanDEM-X DEM is now ready to be distributed to the scientific and commercial
community. |
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