Geocoding error correction for InSAR point clouds

Sina Montazeri, Fernando Rodríguez González, Xiao Xiang Zhu

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Persistent Scatterer Interferometry (PSI) is an advanced multitemporal InSAR technique that is capable of retrieving the 3D coordinates and the underlying deformation of time-coherent scatterers. Various factors degrade the localization accuracy of PSI point clouds in the geocoding process, which causes problems for interpretation of deformation results and also making it difficult for the point clouds to be compared with or integrated into data from other sensors. In this study, we employ the SAR imaging geodesy method to perform geodetic corrections on SAR timing observations and thus improve the positioning accuracy in the horizontal components. We further utilize geodetic stereo SAR to extract large number of highly precise ground control points (GCP) from SAR images, in order to compensate for the unknown height offset of the PSI point cloud. We demonstrate the applicability of the approach using TerraSAR-X high resolution spotlight images over the city of Berlin, Germany. The corrected results are compared with a reference LiDAR point cloud of Berlin, which confirms the improvement in the geocoding accuracy.

Original languageEnglish
Article number1523
JournalRemote Sensing
Volume10
Issue number10
DOIs
StatePublished - 1 Oct 2018

Keywords

  • Geocoding
  • Geodetic corrections
  • Ground control point
  • Persistent scatterer interferometry
  • Positioning
  • Synthetic aperture radar
  • TerraSAR-X

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