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Slope Superficial Displacement Monitoring by Small Baseline SAR Interferometry Using Data from L-band ALOS PALSAR and X-band TerraSAR: A Case Study of Hong Kong, China

by Fulong Chen 1,2,*, Hui Lin 3,4 and Xianzhi Hu 3
1
Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, No. 9 Dengzhuang South Road, Haidian District, Beijing 100094, China
2
International Centre on Space Technologies for Natural and Cultural Heritage under the Auspices of UNESCO, No. 9 Dengzhuang South Road, Haidian District, Beijing 100094, China
3
Institute of Space and Earth Information Science, The Chinese University of Hong Kong, ShaTin, Hong Kong 999077, China
4
Department of Geography and Resource Management, The Chinese University of Hong Kong, ShaTin, Hong Kong 999077, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2014, 6(2), 1564-1586; https://doi.org/10.3390/rs6021564
Received: 12 December 2013 / Revised: 27 January 2014 / Accepted: 10 February 2014 / Published: 20 February 2014
Owing to the development of spaceborne synthetic aperture radar (SAR) platforms, and in particular the increase in the availability of multi-source (multi-band and multi-resolution) data, it is now feasible to design a surface displacement monitoring application using multi-temporal SAR interferometry (MT-InSAR). Landslides have high socio-economic impacts in many countries because of potential geo-hazards and heavy casualties. In this study, taking into account the merits of ALOS PALSAR (L-band, good coherence preservation) and TerraSAR (X-band, high resolution and short revisit times) data, we applied an improved small baseline InSAR (SB-InSAR) with 3-D phase unwrapping approach, to monitor slope superficial displacement in Hong Kong, China, a mountainous subtropical zone city influenced by over-urbanization and heavy monsoonal rains. Results revealed that the synergistic use of PALSAR and TerraSAR data produces different outcomes in relation to data reliability and spatial-temporal resolution, and hence could be of significant value for a comprehensive understanding and monitoring of unstable slopes. View Full-Text
Keywords: slope superficial displacement; small baseline SAR interferometry; PALSAR; TerraSAR; Hong Kong slope superficial displacement; small baseline SAR interferometry; PALSAR; TerraSAR; Hong Kong
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Chen, F.; Lin, H.; Hu, X. Slope Superficial Displacement Monitoring by Small Baseline SAR Interferometry Using Data from L-band ALOS PALSAR and X-band TerraSAR: A Case Study of Hong Kong, China. Remote Sens. 2014, 6, 1564-1586.

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