A 3D city modeling method based on BIM and GIS

Abstract

The invention discloses a three-dimensional city modeling method based on BIM and GIS, comprising the following steps: data measurement, data processing, establishing BIM model, establishing three-dimensional GIS model, model fusion, municipal simulation, element separation and optimization, model rendering and display; through BIM, the precise height of the building can be easily obtained, appearance size and interior space information, thus through combining BIM and GIS, buildings are modeled first, and then the architectural spatial information is shared with the surrounding geographic environment, and applied to urban 3D GIS analysis, so that the cost of building spatial information can be reduced. At that same time, after the data is collected, point cloud and aerial photograph data are calculated and simulated by data classification comparison, so that the elevation information of the ground object is perfect, the elevation precision of the building model is high, and the roof ismore fine. The invention does not need a large amount of manual interaction modeling, and the data are collected by the unmanned aerial vehicle and the unmanned vehicle, and the efficiency is high, the production period is short, and the timeliness is strong.

Description

technical field [0001] The invention relates to the field of architectural design, in particular to a three-dimensional city modeling method based on BIM and GIS. Background technique [0002] Digital city represents the development direction of urban informatization and is an important means to promote the informatization of the whole country. Since entering the 21st century, digital city has developed rapidly and has become one of the most potential strategic high-tech fields. , in various application systems of digital cities, the 3D city model is gradually replacing the 2D city map, and has become an important tool in many fields such as urban planning, urban management, public safety, heritage protection, traffic navigation, tourism and vacation, military defense, film and television entertainment, etc. The expression form of basic geospatial information. [0003] The construction of traditional 3D city models mainly relies on commercialized computer-aided design softw...

AI Technical Summary

Problems solved by technology

[0003] The construction of traditional 3D city models mainly relies on commercialized computer-aided design software, and adopts a large number of manual interactive modeling methods. For large-scale urban scenes, this method has long production cycle, high cost, difficult update, poor timeliness, and poor timeliness. Problems such as strong dependence on the technical level of modelers have become one of the important bottlenecks restricting the development of digital cities, and traditional 3D city modeling obtains building heights through visual estimation or manual measurement to model. There are problems such as lack of elevation information of ground objects, poor elevation accuracy of building models, and poor roof fineness. At the same time, traditional 3D urban modeling cannot take into account the internal design and implementation of buildings in the microscopic field and the geographic data processing and analysis capabilities in the macroscopic geographic environment. , therefore, the present invention proposes a three-dimensional city modeling method based on BIM and GIS to solve the problems existing in the prior art

Images