Abstract
The previously presented Multidimensional Small Baseline Subset (MSBAS-2D) technique computes two-dimensional (2D), east and vertical, ground deformation time series from two or more ascending and descending Differential Interferometric Synthetic Aperture Radar (DInSAR) data sets by assuming that the contribution of the north deformation component is negligible. DInSAR data sets can be acquired with different temporal and spatial resolutions, viewing geometries and wavelengths. The MSBAS-2D technique has previously been used for mapping deformation due to mining, urban development, carbon sequestration, permafrost aggradation and pingo growth, and volcanic activities. In the case of glacier ice flow, the north deformation component is often too large to be negligible. Historically, the surface-parallel flow (SPF) constraint was used to compute the static three-dimensional (3D) velocity field at various glaciers. A novel MSBAS-3D technique has been developed for computing 3D deformation time series where the SPF constraint is utilized. This technique is used for mapping 3D deformation at the Barnes Ice Cap, Baffin Island, Nunavut, Canada, during January–March 2015, and the MSBAS-2D and MSBAS-3D solutions are compared. The MSBAS-3D technique can be used for studying glacier ice flow at other glaciers and other surface deformation processes with large north deformation component, such as landslides. The software implementation of MSBAS-3D technique can be downloaded from http://insar.ca/.
Highlights
Differential Interferometric Synthetic Aperture Radar (DInSAR) maps ground deformation with high spatial resolution and precision over large areas in line of sight (LOS) of the sensor
The unknown east and vertical components of deformation velocities VE and VU for each acquisition epoch and pixel are solved by applying the singular value decomposition (SVD), and the deformation time series are reconstructed from the computed deformation velocities by numerical integration
Upward motion of the western part of the glacier, is unexpected; it is a processing artifact that will be resolved by the MSBAS-3D technique
Summary
Differential Interferometric Synthetic Aperture Radar (DInSAR) maps ground deformation with high spatial resolution and precision over large areas in line of sight (LOS) of the sensor. In rare cases (e.g., at high latitudes) 3D solution can be derived Another approach is to discard the contribution of the north deformation component (since it has the least weight), which reduces the problem to the 2D case that can be solved using only ascending and descending DInSAR data (Manzo et al 2006; Motagh et al 2017; Palanisamy Vadivel et al 2019). This approach can be extended to produce 2D deformation time series when ascending and descending DInSAR data are acquired at precisely the same times. Ascending and descending DInSAR data are usually acquired at different times and sometimes with different revisit fre-
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
