Abstract
Abstract. Currently, surface subsidence has become an important problem what we are facing. Because of complex topography, uneven distribution of rainfall, and the fast development of urbanization, many cities of the world have undergone surface subsidence disaster, such as Chiba, Paris, Tokyo, Beijing. The surface subsidence has occurred in Chiba since the early twenty-first century. The surface subsidence seriously threatens the safety of human life and property. In order to monitor surface subsidence, people have done a lot of research, and time-series InSAR technique with its better coverage, lower cost and high measurement accuracy advantages shows great potentiality for monitoring surface subsidence. Time-series InSAR technique can be applied for analysis of subtle surface subsidence which occurred consistently for a long term period. This paper uses time-series InSAR technique, Permanent Scatterers Interferometric SAR (PSInSAR), to monitor surface subsidence of Chiba. The used dataset consists of thirty-four Envisat ASAR images from September 2006 to August 2010. For the experimental results, this paper uses GPS data to verify the reliability of the results, and the results can provide information for local government to prevent the occurrence of surface subsidence.
Highlights
Surface subsidence has become an important problem what we are facing
This paper uses coherence coefficient threshold model to elect a sufficient number of points and obtains the distribution of PS points, as shown figure 3.The number of identified target PS points is 12948, and the PS points mainly concentrates in urban and residential areas, such as buildings, roads, rock
In order to verify the reliability of the experimental results, this paper uses settlement information of GPS points to compare with the experimental results
Summary
Surface subsidence has become an important problem what we are facing. Synthetic aperture radar interferometry (InSAR) has opened up a new research direction for monitoring surface subsidence [1]. InSAR has some advantages, such as better coverage and lower cost, and it can work for al-weather condition to monitor surface subsidence. It has become a hot international research. With the in-depth study of InSAR technique, differential interferometry technique (DInSAR) was born [2]. DInSAR technique shows amazing advantage in monitoring earthquakes, volcanoes, landslides and
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