3D velocity field time series using synthetic aperture radar: application to tidal-timescale ice-flow variability in Rutford Ice Stream, West Antarctica

• Main Authors: Milillo, Pietro, Minchew, Brent, Agram, Piyush, Riel, Bryan, Simons, Mark
• Other Authors: Notarnicola, Claudia, Paloscia, Simonetta, Pierdicca, Nazzareno, Mitchard, Edward
• Format: Book Part
• Language: English
• Published: Society of Photo-Optical Instrumentation Engineers 2016
• Subjects: Rutford; Rutford Ice Stream; West Antarctica; Antarc*; Antarctica
• Online Access: https://authors.library.caltech.edu/75197/; https://authors.library.caltech.edu/75197/1/1000309.pdf; https://resolver.caltech.edu/CaltechAUTHORS:20170317-084759208

We present a general method for retrieving time-series of three component surface velocity field vector given a set of continuous synthetic aperture radar (SAR) acquisitions collected from multiple geometries. Our algorithm extends the single-line-of-sight mathematical framework developed for time-series analysis using interferometric SAR (InSAR) to three spatial dimensions. The inversion is driven by a design matrix corresponding to a dictionary of displacement functions parameterized in time. The resulting model minimizes a cost function using a non-regularized least-squares method. We applied our method to Rutford ice stream (RIS), West Antarctica, using a set of 101 multi-track multi-angle COSMO-SkyMed displacement maps generating azimuth and range pixel offsets.