Two Insar procedures for wide and noise interferograms

In unwrapping interferograms with large size and dense residues, the path-following algorithm as a fundamental unwrapping method may produce retrieval error caused by long branch-cuts and repetitive connection of residues. In this paper, two unwrapping algorithms, i.e. the multiple patches method connecting opposite residues and the center expansion method searching opposite residues, are alternatively presented. Some examples of ENVISAT-ASAR datasets demonstrate our improvement better than conventional methods in InSAR data processing.