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

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 OPEN ACCESS Remote Sens. 2014, 6 7934 subsidence mechanism. Finally, the geological interpretation of the detected subsidence center is given.

Wuhan Surface Subsidence Analysis in 2015–2016 Based on Sentinel-1A Data by SBAS-InSAR

“…Therefore, validation results suggest that SBAS InSAR-derived results agree well with results obtained by leveling data, and SBAS InSAR technique can successfully extract surface subsidence information in Wuhan using Sentinel-1A TOPS data with an accuracy of 6 mm/year. This accuracy is similar to the subsidence monitoring accuracies derived by Luo et al [47] and Zhang et al [48]. …”

Ground subsidence in Tucson, Arizona, monitored by time-series analysis using multi-sensor InSAR datasets from 1993 to 2011

“…4(e) and (f)), as the L-band sensor (wavelength of $24 cm) is less sensitive to slow-developing deformation by groundwater extraction in Tucson (i.e. 2.2 (C-band) and 0.53 (L-band) radian change according to 1 cm line-of-sight change) (Luo et al, 2014). Also, it is recognizable that C-band interferograms of Fig.…”

Spatiotemporal Characterization of Land Subsidence and Uplift (2009–2010) over Wuhan in Central China Revealed by TerraSAR-X InSAR Analysis

“…The potential consequences of land subsidence mainly include degradation of the aquifer system and damage to the utility infrastructures, buildings, railroads, highways and bridges [2,3]. In this context, intensive efforts and investigations related to land subsidence monitoring have been untaken in four major subsiding regions in China: the Yangtze River Delta [4,5], the North China Plain [6,7], the Fenwei Basin [8] and the Pearl Delta [9]. As one of the most populous cities in China, Wuhan city has experienced a rapid urban expansion over the past decades.…”