Landslide crack monitoring method based on single-image close-range photogrammetry

Abstract

The invention belongs to the field of geological disaster monitoring, and discloses a landslide crack monitoring method based on single-image close-range photogrammetry. The method comprises the following steps: S1, collecting an image of a monitoring region in real time through a camera; S2, comparing the real-time image of the monitoring image with the initial image, respectively acquiring feature points of the real-time image and the initial image by using a SIFI algorithm, and performing feature point matching to obtain homonymous feature points of the real-time image and the initial image; S3, establishing a two-dimensional field displacement vector model based on the homonymous feature points of the initial image and the real-time image, and detecting an active area based on a grayscale image to obtain a landslide fracture area; and S5, calculating to obtain the width of the landslide crack according to the coordinates in the ground photogrammetry coordinate system correspondingto the homonymous feature points in the landslide body area in the initial image and the real-time image. The method has the advantages of high precision, no contact, wide monitoring range, visual monitoring result and the like.

Description

Technical field [0001] The invention belongs to the field of geological disaster monitoring, and specifically relates to a landslide crack monitoring method based on close-range photogrammetry. Background technique [0002] China has a vast land area, complex geographic environment, and frequent occurrences of geological disasters such as landslides. China is one of the countries most affected by geological disasters in the world. Landslide disasters often cause burial of villages and blockage of roads and rivers, which have a serious impact on people's living environment and greatly threaten people's lives and property. Therefore, it is very important to strengthen the monitoring of slope deformation. Slope deformation monitoring can provide technical basis for preventing landslide and possible sliding and creeping deformation, and predict and forecast the development trend of slope displacement and deformation in the future. However, the technologies used in current monitorin...

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Problems solved by technology

However, this method has the following problems: 1) The monitoring object is the existing landslide cracks, and the cracks that may appear cannot be monitored; 2) It is necessary to arrange circular marking steel brazes at the cracks, and monitor the displacement changes of the circular markings. The change of cracks cannot be directly monitored for the change of the entire crack, and once the circular mark is damaged, it cannot be monitored; 3) The layout density of the circular mark affects the accuracy of the monitoring results, and extensive monitoring based on the surface cannot be realized, which may cause There is a phenomenon of missing monitoring

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