Surface deformation from persistent scatterers SAR interferometry and fusion with leveling data: A case study over the Choushui River Alluvial Fan, Taiwan

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50572

Title:	Surface deformation from persistent scatterers SAR interferometry and fusion with leveling data: A case study over the Choushui River Alluvial Fan, Taiwan
Authors:	Hung,WC;Hwang,C;Chen,YA;Chang,CP;Yen,JY;Hooper,A;Yang,CY
Contributors:	地球科學系
Keywords:	SYNTHETIC-APERTURE RADAR;AQUIFER-SYSTEM COMPACTION;LAND SUBSIDENCE;PERMANENT SCATTERERS;INSAR;EARTHQUAKE;VALLEY
Date:	2011
Issue Date:	2012-03-27 17:37:00 (UTC+8)
Publisher:	國立中央大學
Abstract:	The Choushui River Alluvial Fan (CRAF), one of the most important agricultural areas in Taiwan, suffers severe subsidence caused by groundwater withdrawal. We use 20 ENVISAT images from 2006 to 2008 to derive vertical deformation over CRAF by persistent scatterer interferometry (PSI), which effectively reduces errors affecting conventional DInSAR techniques. The pixel density over CRAF is 107.6 pixels/km(2), compared to 0.19 points/km(2) of the leveling benchmarks. PSI yields vertical displacements matching the leveling result to 0.6 cm/year (RMS), and provides a higher spatial resolution of subsidence than the latter. We also develop a data fusion method that considers the high-precision, low point-density leveling result as a smoothed correction to the PSI result. The combined field is more representative of overall deformation characteristics than the PSI-only or leveling-only field, and it is better suited for the assessment of the impact of subsidence over CRAF. (C) 2010 Elsevier Inc. All rights reserved.
Relation:	REMOTE SENSING OF ENVIRONMENT
Appears in Collections:	[Department of Earth Sciences ] journal & Dissertation

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