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.