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| Titel |
Impact of resolution and radar penetration on glacier elevation changes computed from DEM differencing |
| VerfasserIn |
J. Gardelle, E. Berthier, Y. Arnaud |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250060039
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| Zusammenfassung |
| Regional glacier mass balances can be measured by subtracting multi-temporal digital elevation models (DEMs). However, DEMs are often biased with altitude and it remains unclear whether the elevation differences observed on the ice-free terrain can be used to correct biases on ice-covered areas. We investigate such altitude-related biases using DEMs from three different sensors: SPOT-5, SRTM C-band and SRTM X-band. The bias due to different original DEM resolutions can be corrected using a relationship between curvature and elevation difference, calculated on ice-free terrain. The impact of C-band radar penetration into snow and ice can be evaluated for a specific region by comparing SRTM C-band and SRTM X-band DEMs. In our test area (Karakoram), the resolution-related bias has a minor influence on the region-wide elevation change. Conversely, not accounting for C-Band penetration would seriously biases the mean glacier mass balance. |
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