Science Service System

Summary of Proposal GEO1545

TitleHigh-resolution time series analysis to investigate land subsidence in the Pearl River Delta using multi-satellite radar imagery
Investigator Hua, Wang - Guangdong University of Technology, Department of Surveying Engineering
Team Member
Dr. Lou, Yidong - GNSS Research Center, Wuhan University
Dr Yu, Yongping - Surveying New Technique Research Center, Guangzhou Urban Planning & Design Survey Research Institute
SummaryThe Pearl River Delta (PRD) is one of the most important economic regions with the highest population densities in China. With its dramatic increasing population and economy, considerable land subsidence has occurred here that amplify the negative effect of sea level rise. To date little ground measurements have been conducted in this region, satellite-based InSAR data are therefore critical for regional investigation of land subsidence here. Using Envisat data, our previous study reveals mean coastal subsidence velocity of about 2.5 mm/yr in Shenzhen and Dongguan, two megacities in the PRD region.This proposal aims to combine data acquired by TerraSAR-X, Envisat, and ALOS to estimate land subsidence in the PRD region. Assuming purely vertical deformation, interferograms with different viewing geometries from multiple satellites can be combined to significantly improve the accuracy and temporal resolution of InSAR rate map and time series. This assumption is suitable to the PRD region where is far from the tectonic zones with negligible horizontal displacements. InSAR results will be validated using the precise leveling and GPS data from the Guangdong CORS. We anticipate obtaining land subsidence time series with temporal resolution of a few days. Our results will provide important data for risk assessments on sea level rise and concentrated constructions in the PRD region. The SAR data will be archived on the server at Guangdong University of Technology. All members can access and share the data. The algorithm developed in the project will be released online through our open-source software (Pi-RATE). The project will be financially supported through two grants issued to our team members by GZPI and the Science and Information Technology Bureau of Guangzhou.

Back to list of proposals

DLR 2004-2016