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Ground Subsidence Estimation in a Coastal Reclaimed Land Using JERS-1 L-band SAR Interferometry  

김상완 (연세대학교 지구시스템과학과)
이창욱 (연세대학교 지구시스템과학과)
원중선 (연세대학교 지구시스템과학과)
Publication Information
Economic and Environmental Geology / v.35, no.5, 2002 , pp. 465-478 More about this Journal
Abstract
We measured subsidences occurred in a coastal reclaimed land, Noksan industrial complex, from May 2, 1996 to February 21, 1998, using 5 interferograms of JERS-1 L-band SAR. SAR with a spatial resolution of about 16 m can detect the two-dimensional distribution of subsidence that is difficult to be estimated from in situ measurements. Accuracy of the subsidences estimated by 2-pass DInSAR was evaluated using the measurements of Magnetic Probe Extensometer (accuracy of :${\pm}$1 mm) installed at 42 stations. DInSAR measurements were well correlated with the field measurements showing an average correlation coefficient of 0.77. The correlation coefficient was further improved to be 0.87 (with RMSE of 1.44 cm) when only highly coherenced (>0.5) pixels were used. The slope of regression line was 1.04, very close to the unit value. In short, DInSAR measurements have a good linear relation with field measurements so that we can effectively detect a subsidence in the coastal reclaimed area especially using pixels of high coherence (>0.5). The maximum accumulated subsidence was about 60 cm in the study area, while the subsidence in the northern and south western areas were less than 20 cm. The resuts show that DInSAR is extremely useful for geotechnical applications as well as observation of natural deformation.
Keywords
Differential SAR interferometry (DInSAR); Reclaimed land; Subsidence rate; JERS-1; L-band SAR;
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