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Remote Sens. 2016, 8(4), 338; doi:10.3390/rs8040338

TerraSAR-X Data for High-Precision Land Subsidence Monitoring: A Case Study in the Historical Centre of Hanoi, Vietnam

1
Center for Space and Remote Sensing Research, National Central University, Zhongli District, Taoyuan City 32001, Taiwan
2
Institute of Geophysics, National Central University, Zhongli District, Taoyuan City 32001, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editors: Zhong Lu and Prasad S. Thenkabail
Received: 21 February 2016 / Revised: 31 March 2016 / Accepted: 12 April 2016 / Published: 19 April 2016
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Abstract

In this study, subsidence patterns in the Historical Centre of Hanoi, Vietnam are mapped using the Interferometric Synthetic Aperture Radar (InSAR) technique, with particular emphasis on the stability of ancient monuments, historical buildings and archaeological sectors. Due to the small and scattered characteristics of these structures, not only is a comprehensive coverage of radar targets needed, but also the details of a single building or monument. We took advantage of the high-resolution TerraSAR-X imagery with the aid of oversampling implementation on the Small Baseline (SB) InSAR approach to reveal the subsidence patterns. A total of 6.29 million radar targets were obtained, maintaining the average density of 217,012 points/km2. Our results suggest that image oversampling not only increased the number of measurement points 4.4 times more than the standard processing chain, but also removed some of the noisiest points. The observed subsidence patterns are mostly related to adjacent groundwater extraction and construction activities, with maximum subsiding rate reaching −18.1 mm/year for the study period April 2012 to November 2013. Generally, heritage assets and monuments in the Citadel, the Old Quarter and French Quarter remain in a steady state, whereas those located along the Red River and in southern Hanoi are subject to subsidence. View Full-Text
Keywords: land subsidence; synthetic aperture radar; small baseline interferometry; TerraSAR-X; Historical Centre of Hanoi; heritage culture assets land subsidence; synthetic aperture radar; small baseline interferometry; TerraSAR-X; Historical Centre of Hanoi; heritage culture assets
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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. (CC BY 4.0).

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MDPI and ACS Style

Le, T.S.; Chang, C.-P.; Nguyen, X.T.; Yhokha, A. TerraSAR-X Data for High-Precision Land Subsidence Monitoring: A Case Study in the Historical Centre of Hanoi, Vietnam. Remote Sens. 2016, 8, 338.

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