Ground settlement monitoring from temporarily persistent scatterers between two SAR acquisitions

Zhang Lei, Xiaoli Ding, Feng Guangcai, Lu Zhong

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


We present an improved differential interferometric synthetic aperture radar (DInSAR) analysis method that measures motions of scatterers whose phases are stable between two SAR acquisitions. Such scatterers are referred to as temporarily persistent scatterers (TPS) for simplicity. Unlike the persistent scatterer InSAR (PS-InSAR) method that relies on a time-series of interferograms, the new algorithm needs only one interferogram. TPS are identified based on pixel offsets between two SAR images, and are specially coregistered based on their estimated offsets instead of a global polynomial for the whole image. Phase unwrapping is carried out based on an algorithm for sparse data points. The method is successfully applied to measure the settlement in the Hong Kong Airport area. The buildings surrounded by vegetation were successfully selected as TPS and the tiny deformation signal over the area was detected.
Original languageEnglish
Title of host publication2009 Joint Urban Remote Sensing Event
Publication statusPublished - 26 Oct 2009
Event2009 Joint Urban Remote Sensing Event - Shanghai, China
Duration: 20 May 200922 May 2009


Conference2009 Joint Urban Remote Sensing Event

ASJC Scopus subject areas

  • Artificial Intelligence
  • Computer Networks and Communications
  • Ecology
  • Nature and Landscape Conservation


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