关键词: 滑坡监测, D-INSAR, PS, SBAS, GPS, LISA

Abstract:

Monitoring natural landslide hazards in a wide mountainous area has been a worldwide problem for a long time. Differential Synthetic Aperture Radar Interferometry (D-INSAR) technique, which is a main profile of satellite SAR application, has been an important developmental direction of microwave remote sensing in recent years. Although the D-INSAR technique is still under development and there are several bottlenecks that need to be solved; however, because it has an ability to theoretically measure a very small movement of the ground at a centimetre level for a continuous large areas, this technique can be considered as a potentially ideal tool for monitoring and forecasting occurrence of landslides. With the purpose of applying the D-INSAR to landslide hazard monitoring and early warning, this paper firstly introduces the main algorithms, derivation principles and processing method of the D-INSAR technique. Then based on a detailed review for the application studies to this subject so far in the world, the advantages and difficulties concerning the application of this technique to landslide monitoring are concluded. By means of some new developments of monitoring technique, possible solutions for the existing problems to practical application of D-INSAR are proposed. D-INSAR should be synthetically utilized with advanced earth detection and digitization techniques in monitoring landslide, such as permanent scatterers (PS), small baseline subset(SBAS), global positioning system(GPS), linear SAR (LISA) technique. These techniques are suggested to be combined with the D-INSAR technique together to improve an effective monitoring.

Key words: landslide monitoring, D-INSAR, PS, SBAS, LISA, GPS