Measuring the surface deformation caused by landslide in Wanzhou by InSAR technique
Jingfa Zhang(1) , Zuxi Ouyang(1)
, Lixia Gong(1)
, Qiming Zeng(2)
, Jan-Peter Muller(3)
, and Zhenhong Li(3)
Institute of Crustal Dynamics, CEA,
Postbox 2855, Beijing,
(2) Perking University, Institute of RS and GIS, Perking University, 100871,Beijing, China
(3) University College London, University College London, Gower Street, London WCIE 6BT, United Kingdom
The measurement of landslide deformation in Wanzhou is related to the safety of 3 Geoges Migration Engineering. But, the atmospheric artifacts and other factors seriously influence the results from InSAR method. Experiments are carried out by using a number of ERS-1/2 and Envisat SAR acquisitions, to analyze the influence degree of every factor precisely, and to determine the preventing method.
This paper measures the deformation of some landslides by PS InSAR technique. Firstly, ERS-1/2 SAR images are used to extract possible natural PS points and to measure their deformation in the past years. Secondly, man-made corner reflectors are used in lately deformation monitoring. Man-made corner reflector bears precision position information and markedness image feature. They act as control points in the skeleton net of deformation monitoring. Man-made corner reflectors can be recognized by some special method in this paper.