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Method for extracting dual-time-phase dual-polarized interference SAR image water area

An extraction method, a dual-polarization technology, applied in the field of dual-temporal dual-polarization interferometric SAR image water area extraction

Inactive Publication Date: 2017-11-07
邓少平
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Problems solved by technology

[0005] The purpose of the present invention is to solve the extraction method of the respective waters on the dual-temporal dual-polarization interferometric SAR complex image

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  • Method for extracting dual-time-phase dual-polarized interference SAR image water area
  • Method for extracting dual-time-phase dual-polarized interference SAR image water area
  • Method for extracting dual-time-phase dual-polarized interference SAR image water area

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[0042] A further detailed description will be made below in conjunction with the accompanying drawings and embodiments of the present invention:

[0043] The purpose of the present invention is to propose a water index based on the characteristics of smaller intensity and weaker coherence of the water area on the bitemporal phase interference SAR image to enhance the water area information and improve the interpretation effect. The present invention will be described below in conjunction with the accompanying drawings and specific embodiments Do further elaboration.

[0044] please see figure 1 , the present invention is a dual-temporal dual-polarization interferometric SAR image waters extraction method, the data of this embodiment is the dual-polarization SAR image acquired by the C-band radar of the Sentinel 1 A star of the European Space Agency, and the polarization mode is VV / VH, the area is located in the Poyang Lake area of ​​Nanchang City, Jiangxi Province. The acqui...

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Abstract

The invention discloses a method for extracting a dual-time-phase dual-polarized interference SAR image water area, namely a SAR image water area extracting method. The method successively comprises subpixel-level registration, coherence coefficient calculation, total power diagram calculation, total power mean value calculation, total power normalized scattering coefficient calculation, water area index calculation, calculation of water area average and standard deviation of a statistical water area, and binaryzation. The method, in view of low precision and low automation degree of water interpretation on a SAR image, provides, based on a characteristic that a coherent SAR image has good coherence to most ground features within short time intervals, a SAR image water area index based on dual-polarized SAR data coherence coefficient and intensity value, enhances water area information on the image, restrains other ground features, improves the automation degree of water interpretation in each time-phase image, helps to enhance users' recognition and accuracy of SAR images, and accelerates the popularization and application of the SAR in flood monitoring and topographic mapping.

Description

[technical field] [0001] The invention belongs to the technical field of computer image processing, and relates to a method related to interpretation of Synthetic Aperture Radar (SAR) remote sensing images, in particular to a method for extracting water areas of dual-temporal, dual-polarization interference SAR images. [Background technique] [0002] Water area is one of the most important types of ground features in remote sensing images. In the microwave band of SAR work, it has the ability to work all-weather and all-weather, and has obvious advantages in water area extraction. It has very important applications in flood monitoring and assessment, emergency surveying and mapping, and topographic mapping. The current existing methods are mainly based on water area extraction methods of single-temporal intensity or amplitude images, and their accuracy and efficiency need to be improved. At present, the sources of SAR data are becoming more and more abundant. Many SAR satel...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9023G01S13/9076
Inventor 邓少平侯瑞冷海芹吴泽洪刘学林孙盛王璇
Owner 邓少平
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