Dissertation > Astronomy,Earth Sciences > Geology > Hydrogeology and Engineering Geology > Engineering Geology > The geological and engineering geological > Land subsidence

Study on Model and Methods of Extracting Deformation Combinating TerraSAR-X and Palsar Image

Author SangMingZhi
Tutor LiuGuoXiang
School Southwest Jiaotong University
Course Photogrammetry and Remote Sensing
Keywords Synthetic aperture radar differential interferometry Regional subsidence Permanent scatterers The multi sensors solving modeling
CLC P642.26
Type Master's thesis
Year 2011
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Land subsidence phenomenon under the combined effects of the development of human society and the Earth 's own movement . This phenomenon is the result of long-term accumulation of huge socio-economic losses or completely changed Earth 's landforms . Society and the advancement of technology , humans gradually became aware of the dangers of this phenomenon , and analyzes the causes of in order to prescribe the right medicine , take preventive measures . Ground subsidence area usually relatively large-scale , how fast , and accurate monitoring of regional subsidence , for ground subsidence information , to provide scientific support for the government decision-making has become particularly important . Synthetic aperture radar interferometry (DInSAR) appeared in the 1990s , compared with the conventional regional subsidence monitoring techniques (such as leveling and global positioning satellite technology) , DInSAR technology able to get the the tiny ground deformation information at the same time , also has dynamic , efficient , continuous , and monitoring a wide area characteristics . The emergence of new issues tend to be play a role in promoting the progress of science and technology . The time lost Coherent space after the loss of coherence and atmospheric effects become DInSAR technology bottlenecks , the scientists proposed the concept of permanent scatterers (PS) , and successfully applied to the monitoring of ground subsidence . In this paper, the real aperture radar ( RAR ) , synthetic aperture radar ( SAR ) , radar interferometry (InSAR) and radar differential interferometry (DInSAR) were introduced in detail . Same area X-band TerraSAR images on the L-band PALSAR images of two-track differential interference experiment to obtain experimental zone deformation , and different band DInSAR technology discussion . The permanent scatterers differential interferometry (PS-DInSAR) can weaken the impact of space-time loss of coherence and atmospheric delay . PS-DInSAR technology , and the establishment of a ground reference point under the conditions of multi - sensor data combined to obtain three-dimensional deformation model . Permanent scatterer the differential interferometric methods (PSI) improved X-band TerraSAR data of the same area and L-band PALSAR data the subsidence information extracted in the region , based on a simplified reference point multisensor joint model and least squares method vertical to form variables as well as the level of the solution to the form of variable data and existing research results and standards is verified by comparing the model 's reliability .

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