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Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry

Villano, Michelangelo and 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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Abstract

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.

Document Type:Conference or Workshop Item (Poster)
Title:Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry
Authors:
AuthorsInstitution or Email of Authors
Villano, MichelangeloUNSPECIFIED
Papathanassiou, Konstantinos P.UNSPECIFIED
Date:March 2011
Journal or Publication Title:Proceedings of ESA POLinSAR Workshop
Refereed publication:Yes
In ISI Web of Science:No
Publisher:ESA Communications
Status:Published
Keywords:differential shift estimation, feature-tracking, glacier monitoring
Event Title:ESA POLinSAR Workshop
Event Location:Frascati, Italy
Event Type:international Conference
Event Dates:2011-01-24 - 2011-01-28
Organizer:European Space Agency (ESA)
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Tandem-L Vorstudien (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Michelangelo Villano
Deposited On:21 Apr 2011 09:48
Last Modified:08 May 2014 23:28

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