Abstract
Abstract. At present, time series InSAR technology has been widely used in surface deformation monitoring. The extraction of permanent scatterers is an important part, which is directly related to the accuracy of monitoring results. The existing permanent scatterers extraction methods are mainly based on the amplitude information or the coherence information, there is a problem that the point quality and point density cannot be taken into account, and the selection of the point parameters requires operators to have a wealth of experience. In order to solve the above problems, a permanent scatterers extraction method based on the combination of amplitude and model coherence coefficient is proposed in this paper. This method examines not only the amplitude information of the permanent scatterers, but also the phase information of the point. And the phase quality directly affects the accuracy of deformation inversion. This paper takes Yupu Bridge, Yiqiao Town, Xiaoshan District, Hangzhou City as the experimental area to carry out comparative experiments. The results show that the final point target density extracted by this method is 1.97 times that of the conventional method based on amplitude information, and shows the details of deformation distribution of Yupu Bridge more completely.
Highlights
With the acceleration of urbanization, the continuous rise of all kinds of tall buildings, as well as the construction of various large and medium-sized bridges, it is urgent to monitor the surface deformation of urban and key buildings
Determine the small baseline pair according to the spatio-temporal baseline threshold, and check whether the generated differential interferogram has serious incoherence, eliminate the seriously incoherent differential interferogram, and ensure the final network connectivity
A total of 106 differential interferograms are generated, and the spatial-temporal baseline distribution of interference pairs is shown in figure 1
Summary
Yonghui KANG*, Yonghong ZHANG, Hong’an WU Chinese Academy of Surveying and Mapping, Beijing 100830, China. The results show that the final point target density extracted by this method is 1.97 times that of the conventional method based on amplitude information, and shows the details of deformation distribution of Yupu Bridge more completely
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