Mountain area surface micro deformation information extraction method based on SAR images

An information extraction and micro-deformation technology, which is applied in the field of image processing and can solve the problem of not being able to extract permanent scattering points.

Active Publication Date: 2016-10-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

The traditional permanent scatter point selection algorithm is limited by the surface type. Ground objects such as artificial buildings and exposed rocks and gravels have strong correlations and can be selected as permanent scatter points. However, mountainous areas covered by vegetation often cannot extract enough permanent scatter point

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  • Mountain area surface micro deformation information extraction method based on SAR images
  • Mountain area surface micro deformation information extraction method based on SAR images
  • Mountain area surface micro deformation information extraction method based on SAR images

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Embodiment

[0051] For the convenience of description, the relevant technical terms appearing in the specific implementation are explained first:

[0052] SAR (Synthetic Aperture Radar): synthetic aperture radar;

[0053] KS (Kolmogorov-Smirnov): Kolmogorov-Smirnov test.

[0054] figure 1 It is a flow chart of the method for extracting surface micro-deformation information in mountainous areas based on SAR images in the present invention.

[0055] In this example, if figure 1 As shown, a method for extracting surface micro-deformation information in mountainous areas based on SAR images of the present invention is characterized in that it comprises the following steps:

[0056] S1. Preprocessing the time series SAR image group

[0057] In the pre-acquired N time series SAR image group, one SAR image is selected as the common main image according to the comprehensive correlation function, and the rest are slave images; then use sarscape software to register each slave image according t...

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Abstract

The invention discloses a mountain area surface micro deformation information extraction method based on SAR images. Precision registering is performed on an SAR image group, amplitude and phase information is extracted, then according to an amplitude deviation exponent threshold method and a normalization copolarization phase difference threshold method of pixel points, permanent scattering points are selected; at the same time, a differential phase graph is obtained by performing differential interference processing by use of the SAR image group and elevation data; then by use of a secondary filtering algorithm, distributed scattering points are selected, and differential phase values of the distributed scattering points are optimized; then the permanent scattering points and the distributed scattering points are merged to form stable scattering points, and a Delaunay triangular network of the stable scattering points is constructed; and finally, surface micro deformation information is obtained by solving differential phases of the stable scattering points by use of a network adjustment method.

Description

technical field [0001] The invention belongs to the technical field of image processing, and more specifically relates to a method for extracting surface micro-deformation information in mountainous areas based on SAR images. Background technique [0002] Permanent scatterer differential interferometry (PS-InSAR) is a technology that uses time-series SAR images to extract surface deformation information. PS-InSAR technology can monitor the surface all day and all day without being affected by the weather, thus providing a fast, effective and economical means for large-scale surface deformation monitoring. China has a vast territory and complex natural environment. PS-InSAR technology can extract surface information under limited observation conditions. Compared with traditional field measurements such as displacement meters and levels, this technology can greatly improve coverage, reduce costs, and improve spatial resolution. The steps of PS-InSAR extraction of surface def...

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G06T7/00
CPCG06T2207/10044G06T2207/30184
Inventor陈彦陈浩童玲
OwnerUNIV OF ELECTRONICS SCI & TECH OF CHINA