Study And Implementation Of Mining Area Land Subsidence Monitoring System Based On SAR Data

Global land subsidence that directly caused by over-exploitation of petroleum,natural gas,solid mineral resources and groundwater resources has already become one of the most severe geologic hazard in recent years.The study of land subsidence analysis and land subsidence monitoring system based on SAR data can provide decision support for reasonable exploitation of underground mineral resources and regulation of mine area land subsidence.And it can also provide theoretical and technical support for rehabilitation and conversation of mining area ecosystem.The study of land subsidence monitoring system has great significance of governing mine geological environment.This thesis has studied the theory and technological process of using D-InSAR technology and SBAS-InSAR technology to extract small surface deformation,using IDL and C# programming language to develop mining area land subsidence system that based on ENVI,SARscape and ArcGIS Engine mined programming technology.This system has achieved:(1)Data reading,layer management,map browsing,spatial analysis and other basic GIS function;(2)Multi-looking,data filtering,geocoding and other SAR data preprocessing function;(3)Differential interferometric technology function based on D-InSAR and SBAS-InSAR.And then this thesis has elaborated the requirement analysis and overall design of the system,analyzed the design thought and core code of each functional module.After debugging the system,choose Datong mining area(Xining City,Qinghai Province)as study area,using TerraSAR-X SAR data to test and verification of every functional module.For data preprocessing module,this study executed the multi-looking,filtering and geocoding procedure of original SSC SAR data,and analyzed the influence of the preprocessing result using different parameter and filter method.And about land subsidence monitoring module,this thesis has extracted land subsidence result map and time series map of study area in 20131001-20131103,20131103-20131206,20131206-20140130 and 20140130-20140428 these four different time period,based on D-InSAR technology and SBAS-InSAR technology.The result reveals that land subsidence phenomenon is very obvious in Datong mining area.And there are three different center of subsidence,they are Xiaomeidong subsidence area,Dameidong subsidence area and Yuanshuer subsidence area.The subsidence area of the four different time period is 3.811km2,3.748km2,4.949km2 and 2.311km2 respectively,and the central subsidence volume of different time period is 45.7mm,48.9mm,56.7mm and 45.8mm respectively.The highest subsidence speed has reached 156mm/year,and highest subsidence volume has reached 91 mm.This thesis has also choosed ten different sampling points as study object in the study area,and showed a similar land subsidence trend amongst the points.