Measurement of slow-moving along-track displacement from an efficient multiple-aperture SAR interferometry (MAI) stacking

Journal of Geodesy
By: , and 

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Abstract

Multiple-aperture SAR interferometry (MAI) has demonstrated outstanding measurement accuracy of along-track displacement when compared to pixel-offset-tracking methods; however, measuring slow-moving (cm/year) surface displacement remains a challenge. Stacking of multi-temporal observations is a potential approach to reducing noise and increasing measurement accuracy, but it is difficult to achieve a significant improvement by applying traditional stacking methods to multi-temporal MAI interferograms. This paper proposes an efficient MAI stacking method, where multi-temporal forward- and backward-looking residual interferograms are individually stacked before the MAI interferogram is generated. We tested the performance of this method using ENVISAT data from Kīlauea Volcano, Hawai‘i, where displacement on the order of several centimeters per year is common. By comparing results from the proposed stacking methods with displacements from GPS data, we documented measurement accuracies of about 1.03 and 1.07 cm/year for the descending and ascending tracks, respectively—an improvement of about a factor of two when compared with that from the conventional stacking approach. Three-dimensional surface-displacement maps can be constructed by combining stacked InSAR and MAI observations, which will contribute to a better understanding of a variety of geological phenomena.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Measurement of slow-moving along-track displacement from an efficient multiple-aperture SAR interferometry (MAI) stacking
Series title Journal of Geodesy
DOI 10.1007/s00190-014-0786-9
Volume 89
Issue 5
Year Published 2015
Language English
Publisher Springer
Publisher location Berlin, Germany
Contributing office(s) Volcano Science Center
Description 15 p.
First page 411
Last page 425
Country United States
State Hawaii
Other Geospatial Kīlauea Volcano
Online Only (Y/N) N
Additional Online Files (Y/N) N