On the importance of path for phase unwrapping in synthetic aperture radar interferometry

Batuhan Osmanoglu, Timothy H. Dixon, Shimon Wdowinski, Enrique Cabral-Cano

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Phase unwrapping is a key procedure in interferometric synthetic aperture radar studies, translating ambiguous phase observations to topography, and surface deformation estimates. Some unwrapping algorithms are conducted along specific paths based on different selection criteria. In this study, we analyze six unwrapping paths: line scan, maximum coherence, phase derivative variance, phase derivative variance with branch-cut, second-derivative reliability, and the Fisher distance. The latter is a new path algorithm based on Fisher information theory, which combines the phase derivative with the expected variance to get a more robust path, potentially performing better than others in the case of low image quality. In order to compare only the performance of the paths, the same unwrapping function (phase derivative integral) is used. Results indicate that the Fisher distance algorithm gives better results in most cases.

Original languageEnglish (US)
Pages (from-to)3205-3220
Number of pages16
JournalApplied Optics
Issue number19
StatePublished - Jul 1 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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