Method for making terrain sections by fusing UAV images and laser point clouds

Abstract

The invention discloses a method for making terrain sections by fusing UAV images and laser point clouds, including obtaining UAV images and laser point cloud data; Section lines with feature attribute labels; extracting skeleton features and detail points; merging section lines, skeleton features and detail points with feature attribute labels to generate refined and thinned topographic section results and other steps. Combined use of laser point cloud and UAV images for ground line production effectively avoids the drawbacks of a single data source. It is not only suitable for the production of high-precision section lines in complex areas, but also can obtain the attribute point information of roads, houses and other ground objects, thus meeting various needs of engineering survey and topographic surveying and mapping.

Description

technical field [0001] The invention relates to the technical field of UAV surveying and mapping, in particular to a method for making terrain sections by fusing UAV images and laser point clouds. Background technique [0002] Topographic section is a very important topographic feature information, which can reflect the elevation fluctuation of a local area in the direction of a certain plane line, and can also visually show the topographic type and characteristics of an area. Therefore, topographic sections are widely used in engineering survey and construction of railways and highways, as well as land surveying and mapping. The traditional method of obtaining terrain sections is that operators use total stations, GPS / RTK and other instruments and equipment to collect terrain point coordinates in the target area, and then calculate and draw the section vector diagram in the office. However, in actual projects, due to the complex terrain environment of the survey area (such...

AI Technical Summary

Problems solved by technology

However, engineering survey tasks such as railways and highways usually require the accurate position of roads, houses and other ground objects on the cross-section, while LiDAR can only obtain the three-dimensional coordinates of the ground, and cannot obtain the spectrum and texture information of the ground objects. Directly interpret the attributes of ground objects such as roads

To sum up, both UAV images and laser point clouds can be used to make terrain cross-sections, but both have their own shortcomings. Relying on a certain technical method alone cannot form a terrain cross-section measurement method suitable for various situations

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