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Remote Sens. 2014, 6(9), 7933-7951; doi:10.3390/rs6097933

L- and X-Band Multi-Temporal InSAR Analysis of Tianjin Subsidence

1
Center of Remote Sensing, Tianjin University, No. 92, Weijin Road, Nankai District, Tianjin 300072, China
2
School of Civil Engineering, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907–2051, USA
3
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
4
Tianjin Institute of Surveying and Mapping, No. 9, Lingkou Road, Xiqing District, Tianjin 3000381, China
*
Author to whom correspondence should be addressed.
Received: 9 April 2014 / Revised: 28 July 2014 / Accepted: 29 July 2014 / Published: 26 August 2014
(This article belongs to the Special Issue Remote Sensing Dedicated to Geographical Conditions Monitoring)
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Abstract

When synthetic aperture radar interferometry (InSAR) technology is applied in the monitoring of land subsidence, the sensor band plays an important role. An X-band SAR system as TerraSAR-X (TSX) provides high resolution and short revisit time, but it has no capability of global coverage. On the other side, an L-band sensor as Advanced Land Observing Satellite-Phased Array L-band Synthetic Aperture Radar (ALOS-PALSAR) has global coverage and it produces highly coherent interferograms, but it provides much less details in time and space. The characteristics of these two satellites from different bands can be regarded as complementary. In this paper, we firstly present a possible strategy for X-band optimized acquisition planning combining with L-band. More importantly, we also present the multi-temporal InSAR (MT-InSAR) analysis results from 23 ALOS-PALSAR images and 37 TSX data, which show the complementarity of L- and X-band allows measuring deformations both in urban and non-urban areas. Furthermore, the validation between MT-INSAR and leveling/GPS has been carried out. The combination analysis of L- and X-band MT-InSAR results effectively avoids the limitation of X-band, providing a way to define the shape and the borderline of subsiding center and helps us to understand the subsidence mechanism. Finally, the geological interpretation of the detected subsidence center is given. View Full-Text
Keywords: subsidence monitoring; L- and X-band; multi-temporal InSAR (MT-InSAR); Permanent Scatterers (PS); Quasi-Permanent Scatterers (QPS) subsidence monitoring; L- and X-band; multi-temporal InSAR (MT-InSAR); Permanent Scatterers (PS); Quasi-Permanent Scatterers (QPS)
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Luo, Q.; Perissin, D.; Zhang, Y.; Jia, Y. L- and X-Band Multi-Temporal InSAR Analysis of Tianjin Subsidence. Remote Sens. 2014, 6, 7933-7951.

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