ERS-2 / ASAR CInSAR campaigns
www.sarmap.ch 3 / 12 / 2009
ERSERS--Envisat Tandem CrossEnvisat Tandem Cross--Interferometry Interferometry Campaigns: first results of CInSAR Campaigns: first results of CInSAR
processing and studies over extended areasprocessing and studies over extended areas
P. Pasquali(1), M. Barbieri(1), A. Cantone(1),
P. Riccardi(1) and M. Engdahl(2)
(1) sarmap s.a., Cascine di Barico, 6989 Purasca, Switzerland
(2) ESA ESRIN, , Frascati, Italy
ERS-2 / ASAR CInSAR campaigns
www.sarmap.ch 3 / 12 / 2009
ERSERS--ASAR CinSAR InterferometryASAR CinSAR Interferometry
Very large baseline (~2km) to compensate the carrier frequencies difference
-> Very sensitive to height (2pi ~5m)-> Coherence maintained for little slopes-> Volume decorrelation is significant
Doppler Centroid difference shall not be large
Short acquisition interval (~28 minutes)
ERS-2 / ASAR CInSAR campaigns
www.sarmap.ch 3 / 12 / 2009
First CInSAR campaign: September 25th 2007 – February 12th 2008
Valid pairs: 1368
Not valid pairs: 1211 (469 bad baseline, 950 too large DC difference)
ERS-2 / ASAR CInSAR campaigns
www.sarmap.ch 3 / 12 / 2009
Second CInSAR campaign: November 18th 2008 – April 7th 2009
Valid pairs: 3193
Not valid pairs: 2628 (721 bad baseline, 2133 too large DC difference)
ERS-2 / ASAR CInSAR campaigns
www.sarmap.ch 3 / 12 / 2009
Coherence statisticsCoherence statistics
- Water areas- Land areas with favourable slope- Land areas with non favourable slope
ERS-2 / ASAR CInSAR campaigns
www.sarmap.ch 3 / 12 / 2009
www.cinsar.info/Joomlawww.cinsar.info/Joomla
ERS-2 / ASAR CInSAR campaigns
www.sarmap.ch 3 / 12 / 2009
Fast displacement of iceFast displacement of ice
ERS-2 / ASAR CInSAR campaigns
www.sarmap.ch 3 / 12 / 2009
GenerationGeneration of of veryvery highhigh resolutionresolution DEMsDEMs
ERS-2 / ASAR DEM Google EarthERS-2 / ASAR phase
Northern Siberia. Every 2
colour cycle corresponds to ~5m elevation difference.The whole height variation is less than 20m in the whole area.
ERS-2 / ASAR CInSAR campaigns
www.sarmap.ch 3 / 12 / 2009
NorthernNorthern SiberiaSiberia coherencecoherence
Potential for filling in / extending SRTM
ERS-2 / ASAR CInSAR campaigns
www.sarmap.ch 3 / 12 / 2009
Atmospheric Atmospheric artefactsartefacts
ERS-2 / ASAR CInSAR campaigns
www.sarmap.ch 3 / 12 / 2009
Volume Volume decorrelationdecorrelation
ERS-1/2 Tandem phase1 day separation
180m normal baseline
ERS-2 / ASAR phase28minutes separation
2100m normal baseline
Google Earth