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Extended D-TomoSAR Displacement Monitoring for Nanjing (China) City Built Structure Using High-Resolution TerraSAR/TanDEM-X and Cosmo SkyMed SAR Data

by Fulong Chen 1,2,3, Wei Zhou 1,2,*, Caifen Chen 4 and Peifeng Ma 5
1
Cooperative Innovation Center for Digitalization of Cultural Heritage in Traditional Villages and Towns, Hengyang Normal University, No. 16 HengHua Road, ZhuHui District, Hengyang 421002, China
2
Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences, No. 9 Dengzhuang South Road, Haidian District, Beijing 100094, China
3
Key Laboratory of Earth Observation Hainan Province, Sanya 572029, China
4
Beijing Jucai Zhenbang Enterprise Management Consultant Co., Ltd., Beijing 100038, China
5
Institute of Space and Earth Information Science, The Chinese University of Hong Kong, ShaTin, N.T., Hong Kong 999077, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(22), 2623; https://doi.org/10.3390/rs11222623
Received: 30 September 2019 / Revised: 5 November 2019 / Accepted: 7 November 2019 / Published: 9 November 2019
(This article belongs to the Special Issue Fusion of InSAR Data and other Sources for Infrastructure Monitoring)
The availability of high-resolution spaceborne synthetic aperture radar (SAR) data coupled with the ongoing refinement of tomographic SAR (TomoSAR) technology has made use of radar data feasible for preventive monitoring and assessment of built structures. In this study, we first applied extended differential TomoSAR (D-TomoSAR) to a set of 26 scenes of TerraSAR/TanDEM-X (TSX/TDX) (2013–2015) and 32 scenes of Cosmo-SkyMed (CSK) (2015–2017) images to estimate motions of skyscrapers, bridges and historical monuments in Nanjing City, China. The calculation and isolation of unknown parameters in the D-TomoSAR model, including linear velocity, thermal dynamics and structural heights, helped to estimate millimetric statistics of motion time series. Then, aforementioned two SAR datasets were tentatively tested using amplitude dispersion and phase stability indicators, highlighting the performance and sensitivity of X-band SAR in structural displacement monitoring. Experimental results demonstrated that motion indexes, e.g., heterogeneities of thermal amplitudes and spatiotemporal displacements, were useful to evaluate the conditions of built structures being monitored, in particular when their structural topology were visible owing to the enhanced density of persistent scatterer (PS) measurements. This study implies the value of high-resolution D-TomoSAR tools in the preventive monitoring and health diagnosis of built structures elsewhere over the world. View Full-Text
Keywords: interferometric SAR; motion; built structure; heritage; Nanjing interferometric SAR; motion; built structure; heritage; Nanjing
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Chen, F.; Zhou, W.; Chen, C.; Ma, P. Extended D-TomoSAR Displacement Monitoring for Nanjing (China) City Built Structure Using High-Resolution TerraSAR/TanDEM-X and Cosmo SkyMed SAR Data. Remote Sens. 2019, 11, 2623.

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