tu1.l10 - ers-envisat tandem cross-interferometry for monitoring of sea ice

ERS-2 / ASAR CInSAR for sea ice monitoring

www.sarmap.ch 27 / 7 / 2010

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



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)



CInSAR processing results over glaciers

Glaciers in east Greenland, Mount Gunnbjørn area



Use of existing DEMs over AntarcticaUse of existing DEMs over Antarctica

RampGLAS/ICESat

Ellipsoid



Use of existing DEMs over AntarcticaUse of existing DEMs over Antarctica

Aster GDEMGTOPO-30

Ellipsoid



EET 2EET 2ndnd campaign coverage over northern campaign coverage over northern latitudeslatitudes



Baffin areaBaffin areaFlattened

interferogramASAR

Amplitude



Grounded ice border?Grounded ice border?

January 4th January 7th January 10th

North-west passage, Northern Canada



Beaufort areaBeaufort area



ASAR amplitude ERS-2 / ASAR phase

Coregistering land or ice?Coregistering land or ice?



Edges of homogeneous fringe frequency areas



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.



Estimation of the displacement azimuth Estimation of the displacement azimuth componentcomponent



“MAI”(Multi Aperture Interferogram)

ERS-2 / ASARinterferogram



First results from EET 3First results from EET 3rdrd campaign over campaign over AntarcticaAntarctica



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

tu1.l10 - ers-envisat tandem cross-interferometry for monitoring of sea ice

Documents