Method for extracting ground objects in tilt measurement scenario

Abstract

The invention discloses a method for extracting ground objects in a tilt measurement scenario. An original tilt measurement scenario uses tree-like storage structure data, and the whole scenario is a root node and is composed of a plurality of scenario block sub-nodes. The method comprises the following steps: (1) setting a ground object extraction area; (2) setting a height filtering surface; (3) extracting ground object triangular facet primitives, and processing by using a composite area union set operation way; (4) the separation of ground objects: subjecting the tilt measurement data to triangulation by using a contour line so that all triangular facets in the contour line are ground object primitives; in the original scenario node, extracting all triangular facets in the current ground object contour line, storing the same as independent ground object primitive groups, and marking the same with ground object IDs; (5) ground object operation including ground object primitive data acquisition, distance calculation, ray collision detection ground object model related operations, and the addition and retrieval of ground object property information.

Description

technical field [0001] The invention belongs to the technical field of power line design, and in particular relates to a method for extracting ground objects in a tilt measurement scene, which can automatically extract ground objects such as houses and trees from the tilt measurement scene under the premise of ensuring the accuracy of data and the accuracy of the outline of the ground features . Background technique [0002] Oblique photography 3D modeling technology and its application have been a hot topic in the field of surveying and mapping in recent years. Due to its outstanding advantages such as high data accuracy and comprehensive surface coverage, it is widely used in smart cities, smart water conservancy, and smart tourism. The present invention mainly relates to its application in power circuit design. [0003] In the design of power lines, it is required to obtain the cross-crossing features such as houses, trees, and roads within the line corridor, measure the...

AI Technical Summary

Problems solved by technology

[0004] At present, there are three main ways of singulating ground objects in the 3D application of tilt measurement scenes on the market: one is to superimpose the supporting vector surface on the ground objects, which looks like a single effect on the surface, but in fact it simply queries the building Contour point vector surface, rather than single separation in the true sense; the second is simple triangular surface grouping, which directly distinguishes the original triangular surfaces in the scene as ground objects or terrain, but such processing will cause the boundary of the ground objects to appear jagged , and the boundaries of the ground objects of different precision levels are inconsistent, which is extremely unsightly, and when it is necessary to replace the ground objects with artificial high-precision models, it cannot be seamlessly spliced ​​with the terrain scene; the third is to manually set the boundaries of the ground objects for triangulation Cutting and separating ground objects, this method is more neat and beautiful, and the boundary of different precision levels is consistent, and does not damage the original data accuracy

However, this method is cumbersome to operate, it is labor-intensive, and it is difficult to achieve accurate matching of ground object contours.

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