Method, device and medium for building facade mapping on large scale topographic map of unmanned aerial vehicle

Abstract

The invention discloses a method, a device and a medium for building facade mapping on a large scale topographic map of an unmanned aerial vehicle. The method comprises the following steps: constructing a real three-dimensional model of a designated building based on a multi-view tilt image; selecting two points from adjacent facades in the real three-dimensional model, and projecting the two points onto a preset measuring projection surface to obtain the projection points of the two points selected from the adjacent facades on a projection plane; calculating the projection lines of the facades and the projection intersection points of the adjacent facades according to the projection points corresponding to the same fa ade; and connecting the projection lines and the projection intersection points according to the topological relationship between the projection lines and the projection intersection points to obtain the outline of the designated building. Through adoption of the method,the outlines of buildings can be accurately extracted according to multi-view tilt images, and the surveying and mapping accuracy and efficiency of buildings are improved.

Description

Technical field [0001] The invention relates to the technical field of architectural surveying and mapping, in particular to a method, device and medium for surveying and mapping the facade of a large-scale topographic map of a drone. Background technique [0002] Topographic map is an important universal map, which is the projection of the location and shape of features and topography on a specific horizontal plane. Specifically, it is to project the features and landforms on the ground onto the projection surface along the vertical line, and draw them according to a certain scale. As an important feature, a house is a key element in various topographic maps. The convenience and accuracy of its surveying and mapping are very important to topographic maps. [0003] In recent years, the use of unmanned aerial vehicles to conduct large-scale topographic map surveying with a scale of 1:2000 or even 1:500 has become a hot research topic in the global surveying field. Compared with tr...

AI Technical Summary

Problems solved by technology

However, when manually drawing the edge of a house directly on a stereo image, a large selection error is likely to occur due to the sharp corners of the linear target in the view; Feature locations such as corner points cannot be directly displayed on the image, making it impossible to perform surveying and mapping

The above-mentioned problems lead to insufficient precision and low efficiency of house surveying and mapping, and to a large extent limit the promotion and application of large-scale topographic maps measured by drones

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