| Autor: |
Strößenreuther, Undine, Horwath, Martin, Schröder, Ludwig, Krieger, L., Floricioiu, Dana, Scheinert, Mirko, Knöfel, Christoph |
| Zdroj: |
Berichte zur Polar- und Meeresforschung; 2018, Issue 716, p177-177, 1p |
| Abstrakt: |
Satellite altimetry provides height measurements of the Antarctic and Greenland ice sheets. The typically applied repeat-track analysis to derive height changes yields an incomplete and inhomogeneous sampling of the investigated areas. By a reasonable interpolation of the irregular pattern the spatial resolution can be improved. Previous studies showed that, amongst different interpolation methods, kriging is capable to yield superior results. However, the commonly used ordinary kriging (OK) neglects errors of the original data. Heterogenous measurement-error filtered kriging (HFK) includes these errors in it's formulation. We investigate these different kriging methods in a closed-loop simulation. For that, a simulated dataset was used, which is based on real data to reflect actual measurement and error conditions. The results clearly demonstrate the benefits of HFK including the improvement of interpolation and provision of meaningful error measures. Finally, this algorithm is applied to height changes derived from the CryoSat-2 satellite altimetry mission in the northeast of the Greenland ice sheet. These rates are compared to surface elevation changes acquired by differencing TanDEM-X subsequent elevation models. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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