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Remote Sens. 2014, 6(2), 1564-1586; doi:10.3390/rs6021564
Article

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

1,2,* , 3,4
 and
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.
Received: 12 December 2013 / Revised: 27 January 2014 / Accepted: 10 February 2014 / Published: 20 February 2014
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Abstract

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.
Keywords: slope superficial displacement; small baseline SAR interferometry; PALSAR; TerraSAR; Hong Kong slope superficial displacement; small baseline SAR interferometry; PALSAR; TerraSAR; Hong Kong
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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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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