Method for acquiring dangerous rock body terrain profile

Abstract

The invention relates to the technical field of surface form acquisition, and discloses a method for acquiring a dangerous rock body terrain profile, the method comprises the following steps: selecting a starting point coordinate and an end point coordinate on a three-dimensional oblique photography model of an unmanned aerial vehicle, determining the sectioning line of the dangerous rock body terrain in a target area to be acquired, and sequentially selecting a plurality of measurement point coordinates near the sectioning line along the sectioning line; then establishing a plane equation of a sectioning plane corresponding to the sectioning line, and calculating to obtain projection coordinates of the measurement points projected to the sectioning plane; and finally, judging the topographic features of the corresponding area according to the projection coordinates of the measurement points, obtaining the coordinates of the fitting points according to the judgment result, and processing to obtain the topographic profile of the sectioning line position. According to the method for acquiring the dangerous rock body terrain profile, the topographic features of the dangerous rock mass can be quickly and accurately acquired by utilizing the measurement data of the three-dimensional oblique photography model of the unmanned aerial vehicle, complicated sectioning operation does not need to be performed by professional software, and the method is particularly beneficial to acquiring the topographic and geomorphic features of steep upright rock mass and overhung rock mass.

Description

technical field [0001] The invention relates to the technical field of surface morphology acquisition, in particular to a method for acquiring a topographic profile of a dangerous rock mass. Background technique [0002] China's mountainous area accounts for 69.1% of the country's total area. Due to the steep topography, dangerous rock masses are often formed on high and steep slopes. After the dangerous rock collapses, it seriously threatens the safety of railways, highways, houses and other buildings and related personnel. At present, the traditional There are four ways to obtain the topographic profile of dangerous rock mass on high and steep slopes: ① measure the profile of dangerous rock mass on site by using total station and other measuring equipment; ② obtain the profile of dangerous rock mass by cutting large-scale topographic maps; The section of the dangerous rock mass is obtained from the 3D point cloud data of the UAV optical image; ④The section of the dangerous...

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Problems solved by technology

[0003] The first method: Due to the high and steep dangerous rock mass, it is difficult for surveyors to reach, not only inefficient, high risk, and low measurement accuracy, but also cannot accurately obtain the micro-geomorphological characteristics of the dangerous rock mass on one measurement line, especially for The upside-down dangerous rock mass cannot be used for actual measurement; the second method: can quickly obtain the profile shape of the terrain, but since the contour line is made by fitting the coordinates of the measurement points, the accuracy is extremely low, and the cut-off section It can only display the macroscopic landform features, and cannot accurately obtain the micro-geomorphic features of the dangerous rock mass upside down, steep dip and nearly upright. The cutting efficiency is low, and the cutting accuracy is also affected by landform vegetation; the fourth method: due to the limited load of the UAV, the power of the laser radar equipment carried by it is often small, and the laser of the radar is irradiated to the dangerous rock mass and returned. The points are limited, and the raw data obtained will still contain the morphological data of the vegetation. Although a small number of laser points can pass through the vegetation to obtain the surface shape, the acquisition cost is high, the technology is difficult, and the operation is not easy. Cutting efficiency is low

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