STANFORD UNIVERSITY
EE 350 RADIOSCIENCE SEMINAR
Professor Howard Zebker

Fall 2001-2002

Date: Wednesday, November 28, 2001
Time: 4:15 PM; Refreshments at 4:00 PM
Location: 460-334


Tiling Approaches for Unwrapping very Large Interferograms

Curtis Chen
JPL

Abstract

Two-dimensional phase unwrapping is a key step in the analysis of interferometric synthetic aperture radar (InSAR) data. While challenging even in the best of circumstances, this problem poses unique difficulties when the dimensions of the interferometric input data exceed the limits of one's computational capabilities. For dealing with such cases, we present a technique whereby the input interferogram is partitioned into a number of smaller tiles that are unwrapped separately and then reassembled in a secondary optimization stage. Statistical models and network-flow constructions are used to enhance both the accuracy and efficiency of this approach. Results are examined for a large topographic interferogram comprising part of an Alaskan mapping project.