Inferring 2D Local Surface-Deformation Velocities Based on PSI Analysis of Sentinel-1 Data: A Case Study of Öræfajökull, Iceland

Jirathana Dittrich, Daniel Hölbling*, Dirk Tiede, Þorsteinn Sæmundsson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Two-dimensional deformation estimates derived from Persistent Scatterer Interferometric (PSI) analysis of Synthetic Aperture Radar (SAR) data can improve the characterisation of spatially and temporally varying deformation processes of Earth’s surface. In this study, we examine the applicability of Persistent Scatterer (PS) Line-Of-Sight (LOS) estimates in providing two-dimensional deformation information, focusing on the retrieval of the local surface-movement processes. Two Sentinel-1 image stacks, ascending and descending, acquired from 2015 to 2018, were analysed based on a single master interferometric approach. First, Interferometric SAR (InSAR) deformation signals were corrected for divergent plate spreading and the Glacial Isostatic Adjustment (GIA) signals. To constrain errors due to rasterisation and interpolation of the pointwise deformation estimates, we applied a vector-based decomposition approach to solve the system of linear equations, resulting in 2D vertical and horizontal surface-deformation velocities at the PSs. We propose, herein, a two-step decomposition procedure that incorporates the Projected Local Incidence Angle (PLIA) to solve for the potential slope-deformation velocity. Our derived 2D velocities reveal spatially detailed movement patterns of the active Svínafellsjökull slope, which agree well with the independent GPS time-series measurements available for this area.
Original languageEnglish
Article number3166
Number of pages29
JournalRemote Sensing
Volume14
Issue number13
DOIs
Publication statusPublished - 1 Jul 2022

Bibliographical note

Publisher Copyright:
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • 2D velocity
  • Iceland
  • Persistent Scatterer Interferometry (PSI)
  • Sentinel-1
  • ellipsoid incidence angle
  • local deformation
  • projected local incidence angle
  • slope deformation
  • psi
  • slope
  • 2d velocity
  • sentinel-1
  • persistent scatterer interferometry

Fields of Science and Technology Classification 2012

  • 207 Environmental Engineering, Applied Geosciences
  • 211 Other Technical Sciences
  • 105 Geosciences

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