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

Wei Chia Hung, Cheinway Hwang, Yi An Chen, Chung Pai Chang, Jiun Yee Yen, Andrew Hooper, Chin Yi Yang

研究成果: 雜誌貢獻期刊論文同行評審

65 引文 斯高帕斯(Scopus)

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/km2, compared to 0.19 points/km2 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.

原文???core.languages.en_GB???
頁(從 - 到)957-967
頁數11
期刊Remote Sensing of Environment
115
發行號4
DOIs
出版狀態已出版 - 15 4月 2011

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