Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry
The estimation of the local differential shift between synthetic aperture radar (SAR) images has proven to be an effective technique for monitoring glacier surface motion. As images acquired over glaciers by short wavelength SAR systems, such as TerraSAR-X, often suffer from a lack of coherence, ima...
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ftdlr:oai:elib.dlr.de:69565 2024-05-19T07:40:43+00:00 Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry Villano, Michelangelo Papathanassiou, Konstantinos P. 2011-03 application/pdf https://elib.dlr.de/69565/ https://elib.dlr.de/69565/1/Villano_Paper_POLINSAR2011_proceedings.pdf en eng ESA Communications https://elib.dlr.de/69565/1/Villano_Paper_POLINSAR2011_proceedings.pdf Villano, Michelangelo und Papathanassiou, Konstantinos P. (2011) Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry. In: Proceedings of ESA POLinSAR Workshop. ESA Communications. ESA POLinSAR Workshop, 2011-01-24 - 2011-01-28, Frascati, Italy. Radarkonzepte Konferenzbeitrag PeerReviewed 2011 ftdlr 2024-04-25T00:20:14Z The estimation of the local differential shift between synthetic aperture radar (SAR) images has proven to be an effective technique for monitoring glacier surface motion. As images acquired over glaciers by short wavelength SAR systems, such as TerraSAR-X, often suffer from a lack of coherence, image features have to be exploited for the shift estimation (feature-tracking). The present paper addresses feature-tracking with special attention to the feasibility requirements and the achievable accuracy of the shift estimation. In particular, the dependence of the performance on image characteristics, such as texture parameters, signal-to-noise ratio (SNR) and resolution, as well as on processing techniques (despeckling, normalised cross-correlation versus maximum likelihood estimation) is analysed by means of Monte-Carlo simulations. TerraSAR-X data acquired over the Helheim glacier, Greenland, and the Aletsch glacier, Switzerland, have been processed to validate the simulation results. Feature-tracking can benefit of the availability of fully-polarimetric data. As some image characteristics, in fact, are polarisation-dependent, the selection of an optimum polarisation leads to improved performance. Furthermore, fully-polarimetric SAR images can be despeckled without degrading the resolution, so that additional (smaller-scale) features can be exploited. Conference Object glacier Greenland German Aerospace Center: elib - DLR electronic library |
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Radarkonzepte Villano, Michelangelo Papathanassiou, Konstantinos P. Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry |
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Radarkonzepte |
description |
The estimation of the local differential shift between synthetic aperture radar (SAR) images has proven to be an effective technique for monitoring glacier surface motion. As images acquired over glaciers by short wavelength SAR systems, such as TerraSAR-X, often suffer from a lack of coherence, image features have to be exploited for the shift estimation (feature-tracking). The present paper addresses feature-tracking with special attention to the feasibility requirements and the achievable accuracy of the shift estimation. In particular, the dependence of the performance on image characteristics, such as texture parameters, signal-to-noise ratio (SNR) and resolution, as well as on processing techniques (despeckling, normalised cross-correlation versus maximum likelihood estimation) is analysed by means of Monte-Carlo simulations. TerraSAR-X data acquired over the Helheim glacier, Greenland, and the Aletsch glacier, Switzerland, have been processed to validate the simulation results. Feature-tracking can benefit of the availability of fully-polarimetric data. As some image characteristics, in fact, are polarisation-dependent, the selection of an optimum polarisation leads to improved performance. Furthermore, fully-polarimetric SAR images can be despeckled without degrading the resolution, so that additional (smaller-scale) features can be exploited. |
format |
Conference Object |
author |
Villano, Michelangelo Papathanassiou, Konstantinos P. |
author_facet |
Villano, Michelangelo Papathanassiou, Konstantinos P. |
author_sort |
Villano, Michelangelo |
title |
Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry |
title_short |
Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry |
title_full |
Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry |
title_fullStr |
Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry |
title_full_unstemmed |
Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry |
title_sort |
differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry |
publisher |
ESA Communications |
publishDate |
2011 |
url |
https://elib.dlr.de/69565/ https://elib.dlr.de/69565/1/Villano_Paper_POLINSAR2011_proceedings.pdf |
genre |
glacier Greenland |
genre_facet |
glacier Greenland |
op_relation |
https://elib.dlr.de/69565/1/Villano_Paper_POLINSAR2011_proceedings.pdf Villano, Michelangelo und Papathanassiou, Konstantinos P. (2011) Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry. In: Proceedings of ESA POLinSAR Workshop. ESA Communications. ESA POLinSAR Workshop, 2011-01-24 - 2011-01-28, Frascati, Italy. |
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