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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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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