DocumentCode :
1993435
Title :
A study of PS-InSAR method for small area urban land subsidence
Author :
Wang, Fan ; Huang, Zhaoquan ; Yu, Le ; Zhou, Lifan ; Zhang, Dengrong
Author_Institution :
Dept. of Earth Sci., Zhejiang Univ., Hangzhou, China
fYear :
2010
fDate :
18-20 June 2010
Firstpage :
1
Lastpage :
6
Abstract :
Persistent Scatterers for SAR Interferometry (PS-InSAR) tecnique allows monitoring the temporal evolution of a deformation phenomenon at millimeter level, via the generation of mean deformation velocity maps and displacement time series from a data set of acquired SAR images. However, the serious noises of multi-temporal SAR images make the selection of permanent scatters (PSs) difficult. In this paper, we propose a novel PS-InSAR method based on wavelet phase analysis to solve this problem by improving the quality of interferograms. Firstly, both the real parts and the imaginary parts of SAR interferograms are processed by wavelet decomposition. Secondly, the interferograms on every level are filtered by grads dependent adaptive filter and reconstructed. Finally, interferograms are processed to identify PSs by using two indices namely, amplitude disperse index and spatial correlation index, followed by an unwrap process to extract land subsidence information. We then use this method to process 12 ENVISAT SAR imags covering Jiaxing city in Zhejiang province, China. The experimental results show its effectiveness in residuals and PSs identification and land subsidence extraction for plain urban area.
Keywords :
adaptive filters; geomorphology; geophysical image processing; image denoising; radar interferometry; radar signal processing; remote sensing by radar; synthetic aperture radar; topography (Earth); wavelet transforms; China; ENVISAT SAR images; Jiaxing city; PS-InSAR method; SAR interferogram imaginary part; SAR interferogram real part; Zhejiang province; amplitude disperse index; deformation phenomenon temporal evolution; displacement time series; grads dependent adaptive filter; image noise; interferogram quality improvement; land subsidence information; mean deformation velocity maps; multitemporal SAR image; permanent scatterer selection; persistent scatterers for SAR interferometry; small area urban land subsidence; spatial correlation index; unwrap process; wavelet decomposition; wavelet phase analysis; Cities and towns; Indexes; Information filtering; Monitoring; Noise; Pixel; Wavelet analysis; Land subsidence; Persistent Scatterers for SAR Interferometry (PS-InSAR); Wavelet;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Geoinformatics, 2010 18th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-7301-4
Type :
conf
DOI :
10.1109/GEOINFORMATICS.2010.5567585
Filename :
5567585
Link To Document :
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