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Integration of InSAR time series analysis and water vapour correction for mapping postseismic deformation after the 2003 Bam (Iran) Earthquake

Lookup NU author(s): Professor Zhenhong Li

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Abstract

Atmospheric water-vapor effects represent a major limitation of interferometric synthetic aperture radar (InSAR) techniques, including InSAR time-series (TS) approaches (e.g., persistent or permanent scatterers and small-baseline subset). For the first time, this paper demonstrates the use of InSAR TS with precipitable water-vapor (InSAR TS + PWV) correction model for deformation mapping. We use MEdium Resolution Imaging Spectrometer (MERIS) near-infrafred (NIR) water-vapor data for InSAR atmospheric correction when they are available. For the dates when the NIR data are blocked by clouds, an atmospheric phase screen (APS) model has been developed to estimate atmospheric effects using partially water-vapor-corrected interferograms. Cross validation reveals that the estimated APS agreed with MERIS-derived line-of-sight path delays with a small standard deviation (0.3-0.5 cm) and a high correlation coefficient (0.84-0.98). This paper shows that a better TS of postseismic motion after the 2003 Bam (Iran) earthquake is achievable after reduction of water-vapor effects using the InSAR TS + PWV technique with coincident MERIS NIR water-vapor data.

Publication metadata

Author(s): Li Z, Fielding E, Cross P

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Geoscience and Remote Sensing

Year: 2009

Volume: 47

Issue: 9

Pages: 3220-3230

Print publication date: 01/09/2009

Online publication date: 12/05/2009

ISSN (print): 0196-2892

ISSN (electronic): 1558-0644

Publisher: IEEE

URL: http://dx.doi.org/10.1109/TGRS.2009.2019125

DOI: 10.1109/TGRS.2009.2019125

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