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Method for converting BIM into GIS model supporting large-volume graded loading

A hierarchical loading, large-scale technology, applied in the field of geospatial information systems, can solve the problems of loss of semantic information, loss of geometric information, and long loading time of large models.

Pending Publication Date: 2020-12-04
JIANGSU PROVINCIAL COMM PLANNING & DESIGN INST
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Problems solved by technology

[0003] At present, the main direction of the industry's research on BIM+GIS is to integrate IFC data into CityGML. This method will have the following problems: 1. IFC and GityGML are formats for data storage and sharing, and they need to be translated into graphics in real time during visualization The data format that the graphics card can render, large models have problems such as long loading time and system crashes
2. By exporting IFC format files from BIM design software such as Revit, there are currently problems such as loss of geometric information and semantic information

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  • Method for converting BIM into GIS model supporting large-volume graded loading
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  • Method for converting BIM into GIS model supporting large-volume graded loading

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[0073] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0074] It should be noted that if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. Implying their relative importance or implying the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination ...

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Abstract

The invention discloses a method for converting a BIM into a GIS model supporting large-volume graded loading. The method comprises the following steps: constructing a database table of the BIM; constructing a three-dimensional earth scene structure, and analyzing component information; grouping the three-dimensional earth scenes; constructing a sub-scene space hierarchical structure, and screening, simplifying and merging the data; converting the BIM model into a B3DM specification, wherein each B3DM file is a tile; and constructing a tree-shaped space structure of the tile set according to the octree. According to the method, model component information is directly extracted in a BIM design software secondary development mode, and information loss is prevented; a 3dtiles format of an OGCcommunity standard is adopted as a GIS model format, hierarchical loading of a large-volume model is supported through an HLOD technology, automatic conversion from a BIM model to an HLOD hierarchical loading GIS model is achieved, and the method has the advantages of being higher in conversion speed, higher in accuracy and the like, and is convenient to apply and popularize practically.

Description

technical field [0001] The invention belongs to the technical field of geospatial information systems, and in particular relates to a method for converting a BIM model into a GIS model that supports large-volume hierarchical loading. Background technique [0002] With the development of computer technology and network technology, the integration of Building Information Modeling (Building Information Modeling, BIM) and Geographic Information System (GIS) on the Web side has become the technical focus of all walks of life. Judging from the information contained in the two, GIS focuses on the large-scale macro environment, and BIM focuses on the micro information inside the building, and there is a complementary relationship between the two. [0003] At present, the main direction of BIM+GIS research in the industry is to integrate IFC data into CityGML. This method will have the following problems: 1. IFC and GityGML are formats for data storage and sharing, and they need to b...

Claims

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Application Information

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IPC IPC(8): G06F16/21G06F16/29G06F30/23
CPCG06F16/212G06F16/29G06F30/23
Inventor 张华季锦章张大镇徐晨
Owner JIANGSU PROVINCIAL COMM PLANNING & DESIGN INST
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