An assessment of the capability of the satellite radar altimeter for measuring ice sheet topographic change
| Autor: | K. C. Partington, Chris Rapley, W. Cudlip |
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| Rok vydání: | 1991 |
| Předmět: | |
| Zdroj: | International Journal of Remote Sensing. 12:585-609 |
| ISSN: | 1366-5901 0143-1161 |
| DOI: | 10.1080/01431169108929674 |
| Popis: | The monitoring of surface topography has frequently been cited as the most important application of the satellite radar altimeter over the ice sheets. The potential of the instrument in this respect is examined in detail using Seasat and Geosat altimeter data recorded over the Wilkes plateau in East Antarctica. The precision of the range measurements is optimized by the use of an improved retracking technique. However, although the r.m.s. precision of range measurements indicated at orbit crossovers, after orbit adjustment, is 20-30 cm, tilt and bias orbit adjustment techniques are shown to leave errors in the measurement of surface elevation change, with magnitudes of the order of tens of centimetres, depending on the location. Additional orbit error, which cannot be identified from crossover residuals, is almost certainly present in the difference measurements. Variable mispointing of the Geosat antenna is considered the most likely explanation for an apparent change in surface scattering prope... |
| Databáze: | OpenAIRE |
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