Method for monitoring three-dimensional deformation of coal mining area by utilizing unmanned aerial vehicle image

Abstract

The invention discloses a method for monitoring three-dimensional deformation of a coal mining area by utilizing an unmanned aerial vehicle image. The method comprises the following steps: estimatinga coal mining ground surface influence area; registering the two time phase unmanned aerial vehicle images I1 and I2; after registration, extracting homonymy points from the unmanned aerial vehicle image corresponding to the coal mining surface influence area, and eliminating mismatching point pairs; according to the extracted homonymy points, determining horizontal movement of the earth surface between two times, and performing spatial interpolation to obtain continuous horizontal movement in an image space; calculating a surface subsidence value between two time phases according to the extracted horizontal movement in combination with a relationship between subsidence and horizontal movement in a coal mining subsidence model; reprojecting the horizontal movement to the direction paralleland perpendicular to the mining trend direction, and fusing the horizontal movement and the subsidence value to obtain the three-dimensional deformation value of the earth surface. According to the invention, three-dimensional deformation monitoring of the coal mine area is realized by using the multi-temporal unmanned aerial vehicle images, the problem of dependence of image-based mining area deformation monitoring on SAR images is solved, and the effect of monitoring three-dimensional deformation of the coal mine area is good.

Description

technical field [0001] The invention relates to a three-dimensional deformation monitoring method of a coal mine area using drone images, and belongs to the field of coal mine deformation monitoring. Background technique [0002] After the local ore body is mined, a cavity is formed inside the rock mass, and the original stress balance state around it is destroyed, causing the stress to redistribute until a new balance is reached. This is a very complicated physical and mechanical change process. , is also the process of rock formation movement and destruction, this process or phenomenon is called rock formation movement. When the area of ​​the goaf expands to a certain range, the movement of the rock stratum develops to the surface, causing the surface to move and deform. This process and phenomenon is called surface movement. From the perspective of the surface movement process, the movement state of the surface point can be described by the vertical movement component an...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for three-dimensional deformation monitoring of coal mining areas using UAV images, which solves the problem of dependence of image-based mining area deformation monitoring on SAR images, and has the advantages of low cost, high precision, and wide monitoring range , easy to realize and other advantages

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