Study On DinSAR Technology Of Monitoring Land Subsidence In Huainan Mining Area

Coal resources exploitation and its utilization has had huge economic benefits, but also has brought a lot of damage to geo-ecological environment in mining area, and it seriously affect people’s normal production and life. So how to monitor land subsidence by effective and economic technology become an urgent problem needed to be solved. Differential Synthetic Aperture Radar Interferometry(DInSAR) is a new technology, which has all-time, all-weather, widely area covering and high mesasurement accuracy capacities, and can be used to measure and monitor land subsidence in mining area.The study area of this thesis is Huainan mining area. We collect41scenes C band ENVISAT ASAR data of Huainan, through DInSAR technology and Doris, a free and open source software, to process these data.In the first research step, this thesis reviews the basic principles and history of InSAR and DInSAR, and major influencing factors of DInSAR data processing. We select "2-pass" DInSAR technology as the data processing method of this thesis by analyzing "2-pass"、"3-pass" and "4-pass’"s advantages and disadvantages of DInSAR data processing methods.Secondly, according to analyzing the coherence maps produced by data processings, we can select10pictures of good coherence maps. Finally, by analyzing sedimentation diagram and vector diagram during the year from2006to2010, we can get the maximum settlement value and range in various time intervals, such as2006.11.4-2006.12.9,2006.12.9-2006.2.17、 2007.2.17-2007.3.24.2009.2.24-2009.3.31、2009.1.20-2009.3.31、2010.1.5-2010.2.9、2010.2.9-2010.3.16、2010.1.5-2010.3.16. It is showed that the settlement range and value expand, but the settlement rate tended to be stable. This is consistent with the production practices.Therefore, based on the above analyses, it can be concluded that the DInSAR technology can be used to monitor the land subsidence in the Huainan mining area. It is a new method that can be applied effectively.