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Post-earthquake high-resolution SAR image single building collapse damage detection method

A high-resolution, detection method technology, applied in image enhancement, image analysis, image data processing, etc., to achieve the effect of reducing difficulty, improving accuracy, and improving precision

Active Publication Date: 2018-08-17
INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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Problems solved by technology

[0007] The object of the present invention is to provide a kind of post-earthquake high-resolution SAR image single building collapsed damage detection method, in order to solve the existing problem of extracting collapsed damaged buildings from the complex background environment, the present invention aims at this problem in Based on the analysis of the geometric mechanism of high-resolution SAR imaging of buildings, a set of methods and processes for the extraction of collapsed and damaged single buildings based on sub-meter resolution SAR images are proposed

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  • Post-earthquake high-resolution SAR image single building collapse damage detection method

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Embodiment 1

[0050] see figure 1 , due to the side-view imaging method of the SAR sensor, the SAR image has unique features such as overlapping, short-distance compression, and multiple reflections. figure 1 Example of SAR imaging geometry for an upright single building. figure 1 (a) The relative position relationship between the sensor and the building is given. θ is the radar incident angle, is the azimuth angle of the building. figure 1 (b) is the imaging section and the overview of slant-range imaging according to the SAR slant-range imaging mechanism. It can be seen from the figure that ideally, the most obvious features of buildings in the SAR imaging geometric plane include overlapping areas, secondary reflection areas and shadow areas. figure 1 The black shaded area in (b) is the ground coverage of the building, and it can be seen from the figure that most of the ground coverage of the building is covered by shadows. In the SAR image, the shadow area is formed because the tar...

Embodiment 2

[0085] The building map in this embodiment can be a vector map of each single building obtained through manual interpretation from the corrected high-resolution optical image of the research area.

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Abstract

The invention relates to a post-earthquake high-resolution SAR image single building collapse damage detection method. In a sub-meter-level high-resolution SAR image, the characteristics of the singlebuilding are clear, and the heterogeneity of the target scattering is enhanced. Under the condition of the new data, the detection of the collapse damage of the building can be carried out on the basis of the single building. The method is different from the region-based damage extraction method under the condition of medium and low resolution. Through verification, for a collapse-damaged building, the surface coverage range of a building, where dihedral angle and three-face angle structures are formed has relatively high scattering strength, and the surface coverage range of a building of avertical building shows relatively low scattering strength, so that whether the single building is collapsed and damaged or erected can be judged according to the features in the surface coverage range of the building. According to the principle, the invention designs a single building-based collapse damage or upright judgment detection method for sub-meter-level high-resolution SAR images, the classifier is used for classifying, and finally the effectiveness of the method is verified through result evaluation.

Description

technical field [0001] The invention relates to the technical field of post-earthquake collapse and damage detection of buildings, in particular to a post-earthquake high-resolution SAR image single building collapse and damage detection method. Background technique [0002] It is of great significance for earthquake disaster prevention and mitigation to quickly obtain the collapsed and damaged buildings in the earthquake area after the earthquake disaster. Synthetic Aperture Radar (SAR) has the characteristics of being able to obtain effective data all-weather and all-weather, and monitor in a large area. It is an important data source for earthquake damage assessment after an earthquake occurs. [0003] The most commonly used method for earthquake damage and damage assessment is to use the two images before and after the earthquake for change detection, and to obtain the earthquake damage through the changes in the backscattering intensity, correlation degree, and interfer...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06K9/00G06K9/62
CPCG06T7/0002G06T2207/30181G06T2207/10044G06V20/176G06F18/214
Inventor 吴樊王超龚丽霞张红张波
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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