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Proceedings Paper

SAR interferometry: confronting incoherence in phase unwrapping
Author(s): Heather C. North; Stephen J. McNeill; Chris Pearson
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Paper Abstract

Automated phase unwrapping of a highly incoherent differential interferogram of the Arthur’s Pass earthquake of 1994 has illustrated many challenges to the use of interferometric SAR in the New Zealand environment. Though severe decorrelation between interferometric pairs is common in New Zealand, processing of images for differential interferometry is motivated by the geologically active landscape. The weighted full multigrid (WFMG) phase unwrapping method of Pritt has been implemented for its robust, global operation. This paper examines the opposing requirements to block out the distorting effect of incoherence, and yet to retain valuable connections between coherent regions. Using both synthesised examples and the Arthur’s Pass differential interferogram to illustrate, we propose a modification to the WFMG algorithm, which improves its performance for highly incoherent interferograms.

Paper Details

Date Published: 21 December 2000
PDF: 12 pages
Proc. SPIE 4173, SAR Image Analysis, Modeling, and Techniques III, (21 December 2000); doi: 10.1117/12.410654
Show Author Affiliations
Heather C. North, Landcare Research (New Zealand)
Stephen J. McNeill, Landcare Research (New Zealand)
Chris Pearson, Univ. of Otago (New Zealand)

Published in SPIE Proceedings Vol. 4173:
SAR Image Analysis, Modeling, and Techniques III
Francesco Posa; Luciano Guerriero, Editor(s)

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