Three-dimensional observation method of eroded landform

Abstract

The invention discloses a three-dimensional observation method of eroded landform, belonging to the field of topographic survey. The method is characterized by comprising the steps that: a full-plane laser and a laser positioning spot are emitted to an eroded landform to be observed by a full-plane laser projector and a topography image calibration device; contours are formed on the surface of the landform by the full-plane laser, the laser positioning spot is used as a control spot for dimensional calibration and deformational correction of topography images; the full-plane laser projector is translated or lifted by certain steps, the landform images with different initial altitudes are acquired by an image acquisition device and then superposed and fused via computer software, so as to realize the dense acquisition of landform surface spots; and three-dimensional coordinates of the landform surface spots are acquired in accordance with geometrical information of laser lines in the images to further obtain a micro-space digital landform contour map, thus noncontact three-dimensional measurement for the eroded landform and computational analysis for the three-dimensional model thereof are achieved. The entire system has high observation efficiency and accuracy, and is suitable for the three-dimensional observation of landform in river engineering model test.

Description

technical field [0001] The invention belongs to the technical field of terrain surveying, and relates to a method for scouring terrain observation of a river engineering model. Background technique [0002] In the field of topographic surveying, the traditional surveying method is single-point contact surveying with a level gauge and a theodolite. The non-contact measurement method shows its great application potential in practice. At present, in the research of river engineering models at home and abroad, in addition to the traditional observation techniques, the commonly used topographic observation techniques mainly fall into the following three categories: [0003] The first type, laser ranging technology, by emitting pulsed laser beams to the target surface and receiving the laser beams returned through the target surface, the distance between the object surface point and the range finder is accurately measured by the principle of light speed in the air as a constant v...

AI Technical Summary

Problems solved by technology

The three-dimensional landform observation method and device such as Xu Xiangzhou first applied the structured light measurement method to the real-time observation of the three-dimensional landform by gravity erosion of the slope (Xu Xiangzhou, Xu Feilong, Zhao Chao, Wang Shufang, Zhang Hongwu, three-dimensional landform observation device, Chinese invention patent, application number: 201010144655.8, 2010-4-12. Xu Xiangzhou, Xu Feilong, Zhao Chao, Xu Yi, Guo Xiangyang, three-dimensional landform observation method, Chinese invention patent, application number: 201010144689.7, 2010-4-12.), the observation device has a certain Observation accuracy and high observation efficiency, but it is difficult to apply to the scour terrain of the river engineering model, especially the terrain observation of scour pits

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