Measurement of a small-scale subsidence in a reclaimed land using radarsat-1 SAR

Chang Wook Lee, Hyung Sup Jung, Sang Wan Kim

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Subsidence rate in a reclaimed coastal land of Noksan industrial complex, Korea, was measured by C-band SAR differential interferometry (DInSAR). Surface conditions of the reclaimed land are very rough without vegetation with respect to C-band, which makes strong radar returns. However, artificially loaded top soil is subject to change within a short period so that it is difficult to obtain coherent interferometric pairs by using C-band in a reclaimed land. Seven RADARSAT-1 data sets of fine beam mode (F4) had been obtained between September 2002 and October 2003, and 4 coherent interferograms were generated from them. A large incidence angle (about 41 degree) of RADARSAT-1 F4 fine-beam mode is not favorable for observing flat areas. To obtain coherent interferograms, we used pairs of short temporal and perpendicular baselines. AIRSAR C-band DEM and a DEM constructed from an ERS tandem pair were used to eliminate topographic phase from the interferograms. Estimated interferometry-based subsidence was evaluated by using in-situ data that had been obtained by magnetic probe extensometers with an accuracy of a few millimeters. Compaction process of the newly filled soil is considered as a main cause of the subsidence. The results prove that DInSAR technique using RADARSAT-1 fine-beam mode SAR is a useful tool in the field of geotechnical engineering.

Original languageEnglish
Title of host publicationProceedings of Fringe 2005 Workshop
StatePublished - Feb 2006
EventFringe 2005 Workshop - Frascati, Italy
Duration: 28 Nov 20052 Dec 2005

Publication series

NameEuropean Space Agency, (Special Publication) ESA SP
ISSN (Print)0379-6566


ConferenceFringe 2005 Workshop


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