Land Surface Displacement Geohazards Monitoring Using Multi-temporal InSAR Techniques

Abstract

China has been affected by some of the world’s most serious geological disasters and experiences high economic damage every year. Geohazards occur not only in remote areas but also in highly populated cities. In the framework of the Dragon-4 32365 Project, this paper presents the main results and the major conclusions derived from an extensive exploitation of Sentinel-1, ALOS-2 (Advanced Land Observing Satellite 2), GF-3 (GaoFen Satellite 3), and latest launched SAR (Synthetic Aperture Radar), together with methods that allow the evaluation of their importance for various geohazards. Therefore, in the scope of this project, the great benefits of recent remote sensing data (wide spatial and temporal coverage) that allow a detailed reconstruction of past displacement events and to monitor currently occurring phenomena are exploited to study different areas and geohazards problems, including: surface deformation of mountain slopes; identification and monitoring of ground movements and subsidence; landslides; ground fissure; and building inclination studies. Suspicious movements detected in the different study areas were cross validated with different SAR sensors and truth data.

Keywords

• |dragon-4 project|sentinel-1|gf-3|landslide|geohazards|insar