Improving Accuracy in Geodetic Measurements by Insar Observational Corrections

Project Details


Taiwan suffers from surface deformation for a long time owing to the anthropogenic forcing and its peculiar location between two convergent plates. A systematic monitoring method observing land deformation for the entire Taiwan using advanced remote sensing technology is needed. Sentinel-1 satellite launched by the European Space Agency (ESA) is operated in C-band SAR data. Taking advantage of the broad coverage and short revisit time of Sentinel-1, we can generate interferograms in a rapid and effectively manner for the entire Taiwan. However, Taiwan is situated on the north edge of the Equatorial Ionization Anomaly (EIA) region. The Total Electron Content (TEC) irregularity between snapshots may cause ionospheric effect in the interferograms. The ionospheric residuals induce extra fringes in the interferograms that further affect displacement result. Therefore, our objective is to use global and regional ionospheric data to correct the Sentinel-1 interferogram, aiming to construct a series of ionosphere-corrected displacement for further analysis. This integrated proposal includes three parts: (1) Improving observational accuracy in radar satellite, (2) Integrating spatiotemporal measurements on the ground, and (3) Synthetic usage of spaceborne and ground observations. It follows an iterative procedure, such as: deformation monitoring > ionospheric correction > ground truth validation > deformation error estimate > ionospheric effect recovery > ionosphere TEC estimate > improved deformation monitoring. We will also integrate TEC retrieved from Formorsat-7 occultation events to improve the accuracy of local TEC map, which will eventually help on other geodetic measurements.
Effective start/end date1/08/2031/07/21

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 9 - Industry, Innovation, and Infrastructure
  • SDG 17 - Partnerships for the Goals


  • Synthetic Aperture Radar Interferometry
  • Ionosphere
  • Total Electron Content
  • Surface Deformation
  • Formosat-7


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