Phase-ramp reduction in interseismic interferograms from pixel-offsets

Handle URI:
http://hdl.handle.net/10754/563532
Title:
Phase-ramp reduction in interseismic interferograms from pixel-offsets
Authors:
Wang, Teng ( 0000-0003-3729-0139 ) ; Jonsson, Sigurjon ( 0000-0001-5378-7079 )
Abstract:
Interferometric synthetic aperture radar (InSAR) is increasingly used to measure interseismic deformation. Inaccurate satellite-orbit information, expressed as phase ramps across interseismic interferograms, is believed to be one of the main sources of error in such measurements. However, many interferograms exhibit higher phase gradients than expected from the reported orbital accuracy, suggesting that there are other error sources. Here, we show that interferogram phase ramps are in part caused by uncorrected satellite timing-parameter errors. We propose a two-step approach to reduce the phase ramps using pixel-offsets estimated between SAR amplitude images. The first step involves using a digital elevation model (DEM) to estimate absolute timing-parameter errors for the reference image of the SAR dataset and the second step updates the timing parameters of the master image for each interferogram. We demonstrate a clear ramp reduction on interseismic interferograms covering the North Anatolian Fault in eastern Turkey. The resulting interferograms show clear signs of interseismic deformation even before stacking. © 2014 IEEE.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Environmental Science and Engineering Program; Earth Science and Engineering Program; Crustal Deformation and InSAR Group
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Journal:
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Issue Date:
May-2014
DOI:
10.1109/JSTARS.2014.2298977
Type:
Article
ISSN:
19391404
Sponsors:
The Envisat data used in this paper were provided by the European Space Agency (ESA) through category-1 project 6703. We thank three anonymous reviewers for their helpful comments.
Appears in Collections:
Articles; Environmental Science and Engineering Program; Physical Sciences and Engineering (PSE) Division; Earth Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorWang, Tengen
dc.contributor.authorJonsson, Sigurjonen
dc.date.accessioned2015-08-03T11:53:48Zen
dc.date.available2015-08-03T11:53:48Zen
dc.date.issued2014-05en
dc.identifier.issn19391404en
dc.identifier.doi10.1109/JSTARS.2014.2298977en
dc.identifier.urihttp://hdl.handle.net/10754/563532en
dc.description.abstractInterferometric synthetic aperture radar (InSAR) is increasingly used to measure interseismic deformation. Inaccurate satellite-orbit information, expressed as phase ramps across interseismic interferograms, is believed to be one of the main sources of error in such measurements. However, many interferograms exhibit higher phase gradients than expected from the reported orbital accuracy, suggesting that there are other error sources. Here, we show that interferogram phase ramps are in part caused by uncorrected satellite timing-parameter errors. We propose a two-step approach to reduce the phase ramps using pixel-offsets estimated between SAR amplitude images. The first step involves using a digital elevation model (DEM) to estimate absolute timing-parameter errors for the reference image of the SAR dataset and the second step updates the timing parameters of the master image for each interferogram. We demonstrate a clear ramp reduction on interseismic interferograms covering the North Anatolian Fault in eastern Turkey. The resulting interferograms show clear signs of interseismic deformation even before stacking. © 2014 IEEE.en
dc.description.sponsorshipThe Envisat data used in this paper were provided by the European Space Agency (ESA) through category-1 project 6703. We thank three anonymous reviewers for their helpful comments.en
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)en
dc.subjectDifferential interferometric synthetic aperture radar (InSAR)en
dc.subjectorbital erroren
dc.subjectphase rampen
dc.subjectpixel-offseten
dc.titlePhase-ramp reduction in interseismic interferograms from pixel-offsetsen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.contributor.departmentEarth Science and Engineering Programen
dc.contributor.departmentCrustal Deformation and InSAR Groupen
dc.identifier.journalIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensingen
kaust.authorWang, Tengen
kaust.authorJonsson, Sigurjonen
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