Abstract
Ocean tide loading (OTL) causes crustal displacements in coastal regions, and the relative variation of these ground displacements may reach several centimeters across differential interferometric synthetic aperture radar (DInSAR) interferograms. However, orbit errors seriously affect the analysis of long-wavelength crustal deformation signals such as the OTL effect because of their similar signatures in DInSAR interferograms. To correct the orbit errors, we used a linear surface model to model the relative displacements of the Global Positioning System (GPS) precise point positioning (PPP) in the line of sight (LOS) direction as a priori parameter of the long-wavelength crustal deformation signals. After correcting the orbit errors, an ocean tide model was applied to correct the OTL effect in the DInSAR interferograms. The proposed approach was verified with the DInSAR interferograms from the Los Angeles basin. The experimental results confirm that the real orbit errors can be modeled by the bilinear ramp function under the constraint of the priori parameter. Moreover, after removing the orbit errors, the OTL effect, which is dominant in the long-wavelength crustal deformation signals, can be revealed, and then be effectively eliminated by the FES2004 tide model.
Highlights
Ocean tide loading (OTL), which is an elastic response of the solid Earth to the oceanic mass redistribution, can cause near-shore crustal deformation of several centimeters [1]
precise point positioning (PPP) solutions in theare tideof model is applied to correctinterferograms: the OTL effect in Before analyzing the crustal deformations caused by the OTL effect in differential interferometric synthetic aperture radar (InSAR) (DInSAR) interferograms, 1
We subtracted the priori parameter of the spatial long-wavelength crustal deformation signals from the DInSAR interferograms, and the results were fitted by the bilinear ramp function by the robust regression model
Summary
Ocean tide loading (OTL), which is an elastic response of the solid Earth to the oceanic mass redistribution, can cause near-shore crustal deformation of several centimeters [1]. We first removed the PPP solutions with orbit The errors from the DInSAR interferograms, theassumed long-wavelength deformation signals in the linear surface model, a priori parameter, was to represent crustal the real spatial long-wavelength obvious gross errors. The orbit errors estimated from thein the (LOS) direction, and their relative displacements are fitted to the linear surface model by a robust long-wavelength crustal deformations, the DInSAR interferograms orbit error can be DInSAR interferograms by taking the priori parameter as the constraintafter condition. The linear surface model, a priori parameter, was assumed to represent the real orbit errors from the interferograms, the long-wavelength crustal deformation signals in the used to further the validity the ocean tide model correction. The orbit errors should be accurately removed under the constraint of the relative displacements of the
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