A generic differential interferometric SAR processing system, with applications to land subsidence and snow-water equivalent retrieval

Yngvar Larsen(1) , Geir Engen(1) , Tom Rune Lauknes(1) , Eirik Malnes(1) , and Kjell Arild Høgda(1)

(1) Norut IT, P.O. Box 6434, NO-9294 Tromsø, Norway

Abstract

Implementation of a repeat-pass differential interferometric SAR (D-InSAR) processing facility is a challenging task, involving among other things a precise coregistration of two (or more) complex SAR images, removal of the contribution from topography using a Digital Elevation Model (DEM), and band-pass filtering of common bandwidth to reduce out-of-band noise. Other useful functionality includes multi-looking, identification of layover and shadow areas, and geocoding.

In this paper we will describe the design and implementation of a flexible and fully automatic D-InSAR processing facility. The design is generic, in the sense that the only part that depends on the actual SAR mission is the data reader, and to some degree the orbit propagator. The data readers are designed to implement a generic interface to data, as well as necessary metadata retrieved from data headers or auxiliary metadata files.

We will also present examples from different applications based on the processing system, including use of the ubiquitous ASAR data set showing land subsidence due to the earthquake disaster in Bam, long-term subsidence in Oslo based on ERS data, as well as results from an experiment performed to retrieve the snow-water equivalent (SWE) in a Norwegian hydropower catchment from ASAR data.

 

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