Analysis of ground deformation using SBAS-DInSAR technique applied to COSMO-SkyMed images, the test case of Roma urban area

2012 ◽  
Author(s):  
F. Ardizzone ◽  
M. Bonano ◽  
A. Giocoli ◽  
R. Lanari ◽  
M. Marsella ◽  
...  
Keyword(s):  
Urban Area ◽  
Ground Deformation ◽  
Test Case

Mapping and monitoring urban landslides in New Zealand using Sentinel-1 InSAR data: A case study from Gisborne

2021 ◽  
Author(s):  
Matt Cook ◽  
Martin Brook ◽  
Jon Tunnicliffe ◽  
Murry Cave ◽  
Ian Hamling ◽  
...  
Keyword(s):  
New Zealand ◽  
Urban Area ◽  
Ground Deformation ◽  
Slope Instability ◽  
Interferometric Synthetic Aperture Radar ◽  
Rainfall Events ◽  
Slip Surfaces ◽  
Slow Moving ◽  
Steep Slopes

<p>Landslides are widespread natural hazards that are responsible for substantial economic and societal damage globally each year. In New Zealand, landslides frequently occur on soil and rock, triggered by high rainfall, seismic activity, and land-use change and/or disturbance. This study focuses on Gisborne, a city where ongoing slope instability issues occurring across the steep slopes within the urban area are affecting several properties. Failure commonly occurs along reactivated slip surfaces, when slow-moving retrogressive slides transition into fast-moving flows during intense rainfall events. However, the extent and rate of slope deformation in the Gisborne area are poorly known. Spaceborne Interferometric synthetic aperture radar (InSAR) is a convenient method for measuring ground deformation and over the past decade, SAR systems have significantly developed and provide consistent, reliable, high-resolution global data. In particular, the launch of Sentinel-1 in 2014 marked a significant milestone, being the first civilian satellite designed explicitly for InSAR analysis, and it produces free and open access data. In this study, we illustrate the potential of InSAR to detect the slow movement of landslide deposits in Gisborne before rapid acceleration, using Sentinel-1 data. The pre-failure deformation of several previous landslides in Gisborne is measured to determine possible deformation thresholds for rapid acceleration across the urban area.</p>

scholarly journals RESEARCH ON METHODS OF HIGH COHERENT TARGET EXTRACTION IN URBAN AREA BASED ON PSINSAR TECHNOLOGY

2018 ◽  
Vol XLII-3 ◽  
pp. 901-908 ◽  
Author(s):  
N. Li ◽  
J. Wu
Keyword(s):  
Urban Area ◽  
Ground Deformation ◽  
Extraction Methods ◽  
Deformation Monitoring ◽  
New Method ◽  
Ground Subsidence ◽  
Threshold Method ◽  
High Quality ◽  
Accurate Identification ◽  
Persistent Scatterers

PSInSAR technology has been widely applied in ground deformation monitoring. Accurate identification of Persistent Scatterers (PS) is key to the success of PSInSAR data processing. In this paper, the theoretic models and specific algorithms of PS point extraction methods are summarized and the characteristics and applicable conditions of each method, such as Coherence Coefficient Threshold method, Amplitude Threshold method, Dispersion of Amplitude method, Dispersion of Intensity method, are analyzed. Based on the merits and demerits of different methods, an improved method for PS point extraction in urban area is proposed, that uses simultaneously backscattering characteristic, amplitude and phase stability to find PS point in all pixels. Shanghai city is chosen as an example area for checking the improvements of the new method. The results show that the PS points extracted by the new method have high quality, high stability and meet the strong scattering characteristics. Based on these high quality PS points, the deformation rate along the line-of-sight (LOS) in the central urban area of Shanghai is obtained by using 35 COSMO-SkyMed X-band SAR images acquired from 2008 to 2010 and it varies from −14.6 mm/year to 4.9 mm/year. There is a large sedimentation funnel in the cross boundary of Hongkou and Yangpu district with a maximum sedimentation rate of more than 14 mm per year. The obtained ground subsidence rates are also compared with the result of spirit leveling and show good consistent. Our new method for PS point extraction is more reasonable, and can improve the accuracy of the obtained deformation results.

scholarly journals A Study of Ground Deformation in the Guangzhou Urban Area with Persistent Scatterer Interferometry

Sensors ◽  
2009 ◽  
Vol 9 (1) ◽  
pp. 503-518 ◽  
Author(s):  
Qing Zhao ◽  
Hui Lin ◽  
Liming Jiang ◽  
Fulong Chen ◽  
Shilai Cheng
Keyword(s):  
Urban Area ◽  
Ground Deformation ◽  
Persistent Scatterer Interferometry ◽  
Persistent Scatterer
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