Consistency considered section modeling method of complex 3D building model

Abstract

The invention relates to a consistency considered section modeling method of a complex 3D building model, and belongs to the technical field of geographic space information systems. Multi-form surface objects in the complex 3D building model are sectioned into a semantic surface object set of triangulation and planar discretization, and basic data is provided for feature semantic relation analysis and geometric calculation; multi-level feature semantic relation on the basis of semantic surface objects is extracted in a classified manner, and constrained condition for analyzing a section calculation unit is provided; an atom semantic entity set of regular geometric shape is analyzed and used as the section calculation unit; and geometric shapes of atom semantic entity objects are sectioned one by one to construct sectioned semantic objects that are reconstructed from top to bottom in a classified manner. According to the invention, the section modeling method can be used to a stereo-section model which flexibly creates and visually displays the internal structure of the complex 3D building model and supports analysis and calculation of the hidden relation in the model structure, and the method is conducive to realizing values of data of the 3D model.

Description

technical field [0001] The invention belongs to the technical field of geographic space information systems, and in particular relates to a complex three-dimensional building model cutting modeling method in consideration of consistency. Background technique [0002] Complex 3D building models (Complex3DBuildingModels) are 3D building models with highly realistic appearance and fine and detailed internal structure. The complex 3D building model has a detailed description of the building components, structural relationship and semantic information in the indoor environment, and can support the query and analysis of rich indoor feature information required for professional applications. It is a basic data model widely used in various special geospatial information systems for digital earth and digital regional construction, such as public safety management and emergency response. [0003] Geometry and semantics are the two major elements of describing complex 3D building mode...

AI Technical Summary

Problems solved by technology

[0010] However, the existing section modeling method is oriented to the design of single geometric objects. Therefore, when dealing with complex 3D architectural models composed of independent planes or mesh surfaces with different shapes and staggered distribution, we can only first analyze these diverse shapes. Surface sectioning operations are performed on geometric objects one by one; then, on this basis, the section is constructed and the topological and semantic relationship between the section and the surface of the original model is reconstructed

In the second step of processing, the above-mentioned incomplete topological connection and open boundary problems will lead to the loss of effective section information, directly affect the geometric integrity of the three-dimensional section model, and affect the automatic reconstruction of correct topological relations and complete semantic relations. Therefore, the existing geometric figure cutting technology is difficult to realize automatic cutting modeling of complex 3D building models with consistency in mind.

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