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    Phase-ramp reduction in interseismic interferograms from pixel-offsets

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    Type
    Article
    Authors
    Wang, Teng cc
    Jonsson, Sigurjon cc
    KAUST Department
    Crustal Deformation and InSAR Group
    Earth Science and Engineering Program
    Environmental Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2014-05
    Permanent link to this record
    http://hdl.handle.net/10754/563532
    
    Metadata
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    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.
    Citation
    Wang, T., & Jonsson, S. (2014). Phase-Ramp Reduction in Interseismic Interferograms From Pixel-Offsets. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 7(5), 1709–1718. doi:10.1109/jstars.2014.2298977
    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.
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
    DOI
    10.1109/JSTARS.2014.2298977
    ae974a485f413a2113503eed53cd6c53
    10.1109/JSTARS.2014.2298977
    Scopus Count
    Collections
    Articles; Environmental Science and Engineering Program; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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