標題: Surface deformation from persistent scatterers SAR interferometry and fusion with leveling data: A case study over the Choushui River Alluvial Fan, Taiwan
作者: Hung, Wei-Chia
Hwang, Cheinway
Chen, Yi-An
Chang, Chung-Pai
Yen, Jiun-Yee
Hooper, Andrew
Yang, Chin-Yi
土木工程學系
Department of Civil Engineering
關鍵字: Choushui River;Leveling;Subsidence;Persistent scatterer;DInSAR
公開日期: 15-Apr-2011
摘要: 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.
URI: http://dx.doi.org/10.1016/j.rse.2010.11.007
http://hdl.handle.net/11536/8997
ISSN: 0034-4257
DOI: 10.1016/j.rse.2010.11.007
期刊: REMOTE SENSING OF ENVIRONMENT
Volume: 115
Issue: 4
起始頁: 957
結束頁: 967
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