A method for extracting snow and ice coverage information from sar images based on insar technology
A technology of coverage information and extraction method, applied in the field of ice and snow coverage information extraction from SAR images based on InSAR technology, can solve the problems of unutilized SAR image phase information, difficulty in accurately extracting ice and snow coverage information, and reduced reliability of backscatter coefficients. , to achieve the effect of real-time monitoring capability cost, wide application range and low cost
Inactive Publication Date: 2017-12-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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For areas with complex terrain such as power transmission corridors, the local incident angle has a greater impact, which reduces the reliability of the backscatter coefficient in the SAR image data and brings certain difficulties to the accurate extraction of ice and snow coverage information. In addition, the SAR image data The phase information contained in the
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[0039] For the convenience of description, the relevant technical terms appearing in the specific implementation are explained first:
[0040] SAR (Synthetic Aperture Radar): synthetic aperture radar;
[0041] INSAR (Interferometric Synthetic Aperture Radar): Interferometric Synthetic Aperture Radar;
[0042] figure 1 It is a flow chart of the method for extracting ice and snow coverage information of SAR images based on InSAR technology in the present invention.
[0043] In this example, if figure 1 Shown, a kind of SAR image ice and snow cover information extraction method based on InSAR technology of the present invention comprises the following steps:
[0044]S1. Obtain the original SAR image to be processed
[0045] In this embodiment, the range of a certain monitoring area is: longitude 102.3368°E-102.3886°E, latitude 27.7325°N-27.6964°N. Obtain spaceborne Terra-SAR, X-band, HH polarization, high-resolution single-view complex SAR images with a range resolution of 0...
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The invention discloses a method for extracting ice and snow coverage information of SAR images based on InSAR technology. By performing preprocessing, registration and baseline estimation on multiple single-view complex SAR images without ice and snow information, and single-view complex SAR images containing ice and snow information The backscatter coefficient map is obtained by radiometric calibration of the complex SAR image, and then two interference groups are selected according to the length of the time baseline and space baseline in the baseline information of the SAR image. Single-view complex SAR images containing ice and snow information, the second interference group is composed of two single-view complex SAR images without ice and snow information, and then the coherence coefficients of the two images in each interference group are calculated by the coherence coefficient formula, The coherence coefficient map is obtained, and the threshold value is set for the two coherence coefficient maps and the backscatter coefficient map of the SAR image containing ice and snow information to realize the extraction of ice and snow coverage information.
Description
technical field [0001] The invention belongs to the technical field of image processing, and more specifically relates to a method for extracting ice and snow coverage information of SAR images based on InSAR technology. Background technique [0002] The cryosphere affects all aspects of human engineering facilities, transportation, electricity, production, economic and military activities, etc. Its changes will have a profound impact on water resource cycle and climate change. In addition, the impact and disaster caused by ice and snow disasters to the normal life of human beings is also huge, and the power grid is one of the areas most affected by ice disasters. The power grid is the guarantee for the normal operation of modern society, and my country is one of the few countries with serious ice-covered power grid disasters. In recent decades, large-scale ice and snow disasters have occurred frequently across the country. During the Spring Festival in 2005, a once-in-50-y...
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IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9023
Inventor 陈彦郭财政童玲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA