- Related Research Areas
- Earth Surface & Interior
Point-wise, continuous GPS observations and spatially-dense InSAR are two complementary geodetic data sets which, in combination, ought to provide improved observations of the Earth’s surface displacements. The research hypothesis of this proposal is that GPS observations can correct long-wavelength errors in the InSAR data, which are related to uncertainties in the satellite orbits. Calibration of InSAR with GPS places InSAR observations in a consistent, local GPS reference frame, facilitating the geodynamic interpretation of the geodetic data product. This proposed approach is in contrast to previous efforts to integrate the two methods (with limited success) which used GPS observations to estimate atmospheric delays which were then removed from the interferograms. Here we outline a research proposal to test this hypothesis. We propose a procedure in which SAR imagery is processed to obtain displacement time series using the Small Baseline Subset (SBAS) method. GPS observations are used to correct the interferograms prior to the time-series inversion. A preliminary study of the Eastern California Shear Zone shows that this InSAR-GPS calibration procedure can resolve subtle, long-wavelength tectonic deformation. We propose to develop a robust calibration methodology by conducting a systematic three component research of GPS, InSAR and GPS-calibrated InSAR to assess the requirements for this procedure to deliver improved geodetic observations.
Project PI: Falk Amelung/University of Miami
University of Miami 4600 Rickenbacker Causway Miami, Florida, 33149
Phone: 305 421 4949
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