Mobile-end 3D city dynamic modeling method based on geographic semantics

Abstract

The invention discloses a mobile-end 3D city dynamic modeling method based on geographic semantics. The method comprises the following steps: constructing classification description information and a semantic rule base of a city artificial building facility and a natural geographical entity based on a geometric semantic description method; constructing a geographic semantic library classification mapping analysis module and analyzing a semantic model stored and organized based on the geographic semantic library in a current window range; constructing a model component part 3D geometric outline construction module; and constructing a 3D model dynamic rendering and optimization display module to complete the dynamic construction and the rendering display of a 3D city. A virtual 3D city constructed on the basis of the method has flexible dynamic construction capability. The 3D scene can be constructed and generated dynamically according to a window range and an angle position in order to minimize the utilization rate of hardware resources to the utmost extent and to improve drawing efficiency for satisfying the display and render requirements of a mobile platform.

Description

technical field [0001] The present invention relates to geographical information and three-dimensional digital technology, in particular to a mobile terminal three-dimensional city dynamic modeling method based on geographic semantics. Background technique [0002] Virtual 3D city is an important content and basic supporting technology for the construction of digital cities and smart cities. Virtual 3D cities break through the limitations of traditional 2D maps, and have better display and expression capabilities for comprehensive geographic information of real cities. From the air to the Underground, from outdoor to indoor, from natural geographic entities to artificial building facilities, the virtual 3D modeling of the city is carried out in all directions and from multiple perspectives. in-depth application. [0003] At present, there are mainly three modeling methods for 3D cities at home and abroad: 1) Construct a virtual 3D city in the form of secondary development b...

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of the above-mentioned 3D city construction method mainly include: 1) The third-party virtual earth engine has a complex structure and many functions, and its operation efficiency is low and it is difficult to optimize

The model loading method also loads a single or multiple models into the memory at one time, which has high requirements for platform hardware resources and is difficult to support mobile platforms; 2) The modeling rules and The method is designed and encapsulated in its software, and must follow the rules and methods defined by it, which can meet the needs of most applications to a certain extent.

However, it is difficult to independently and flexibly expand according to the actual situation. At the same time, its modeling and operation efficiency is insufficient, so far it cannot be extended to run on mobile platforms such as mobile phones; In terms of design and program development, a large number of technical challenges and long-term development workload need to be faced, construction and application are difficult, and it is difficult to support the construction of large scenes and 3D cities with complex interactive characteristics

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