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ERS-ENVISAT TANDEMERS-ENVISAT TANDEMCROSS-INTERFEROMETRYCROSS-INTERFEROMETRY
FOR MONITORING OF SEA ICEFOR MONITORING OF SEA ICE
P. Pasquali(1), A. Cantone(1), M. Barbieri(1),
and M. Engdahl(2)
(1) sarmap s.a., Cascine di Barico, 6989 Purasca, Switzerland
(2) ESA ESRIN, , Frascati, Italy
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ERS-ASAR Cross-Interferometry (CinSAR)ERS-ASAR Cross-Interferometry (CinSAR)
Very large baseline (~2km) to compensate the carrier frequencies shift
-> Very sensitive to height (2pi ~5m)-> Coherence maintained for little slopes
Short acquisition interval (~30 minutes)
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CInSAR processing results over glaciers
Glaciers in east Greenland, Mount Gunnbjørn area
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Use of existing DEMs over AntarcticaUse of existing DEMs over Antarctica
RampGLAS/ICESat
Ellipsoid
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Use of existing DEMs over AntarcticaUse of existing DEMs over Antarctica
Aster GDEMGTOPO-30
Ellipsoid
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EET 2EET 2ndnd campaign coverage over northern campaign coverage over northern latitudeslatitudes
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Baffin areaBaffin areaFlattened
interferogramASAR
Amplitude
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Grounded ice border?Grounded ice border?
January 4th January 7th January 10th
North-west passage, Northern Canada
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Beaufort areaBeaufort area
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ASAR amplitude ERS-2 / ASAR phase
Coregistering land or ice?Coregistering land or ice?
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Edges of homogeneous fringe frequency areas
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Estimation of the displacement azimuth Estimation of the displacement azimuth componentcomponent
ERS-2 / ASARinterferogram
“MAI”(Multi Aperture Interferogram)
D. Bechor and H. A. Zebker, 2006, Measuring two-dimensional movements using a single InSAR pair, Geophys. Res. Lett.
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Estimation of the displacement azimuth Estimation of the displacement azimuth componentcomponent
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“MAI”(Multi Aperture Interferogram)
ERS-2 / ASARinterferogram
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First results from EET 3First results from EET 3rdrd campaign over campaign over AntarcticaAntarctica
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ConclusionsConclusions
• EET CInSAR data have a great potential for monitoring sea ice dynamic
• In case of large displacements, 2D components can be estimated from the data, with updated MAI strategies
• Updated strategies for coregistration shall be exploited
• Long segments processing is of great importance