Science Service System

Summary of Proposal LAN3337

TitleGround deformation monitoring in Guiyang with TerraSAR-X images
Investigator Shuqing, Zhao - Sun Yat-sen University, School of Earth Science and Geological Engineering
Team Member
doctoral candidate Mingzhang, Sun - Sun Yat-sen University, School of Earth Science and Geological Engineering
Summary

Ground subsidence has mostly occurred in urban and suburban areas due to various reasons including excess exploitation of groundwater and mining. High subsidence rate in urban areas increases the risk of flooding and damage of their infrastructures due to the induced surface fracturing by subsidence. Although traditional leveling and GPS data are able to provide reliable observations of ground subsidence, they are limited by low spatial sampling density and high cost. To overcome these intractable problems, an advanced remote sensing technique,referred to as Differential Interferomeric Synthetic Aperture Radar (DInSAR), was introduced as a feasible way to monitor deformation over wide areas with centimeter-to-millimeter accuracy. In this work, the advanced DInSAR techniques known as Small Baseline Subset (SBAS) approach and Persistent Scatterer (PS)were exploited to detect and measure variations of the ground surface in Guiyang city, Southwest China. The SBAS and PS techniques allow for investigating ground deformation at two spatial scales, namely: the regional and the local scales. The TerraSAR-X data were 11 days repeat cycle, so TSX offers higher temporal resolution. In addition, TerraSAR-X can provide us with high-resolution data, so it can provide more detailed information. The work provides a full-resolution deformation maps and the associated time series.

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DLR 2004-2016