Construction And Application Of 3D Geographic Information System Of Pipe Network Based On WebGL

Urban water supply network is an important part of urban infrastructure,is the survival and development of the city lifeline.With the increasing scale of the city and constantly updated,the safety supervision of water supply network has become an important task at all levels of government.As the pipeline mostly buried in the ground,the traditional two-dimensional pipe network display lack of intuitive,can not meet the needs of modern urban management.Based on the three-dimensional visualization of urban pipe network,this paper has provided the technical means for water quality supervision and water quality warning of water supply network,and so on.This paper has the following advantages:"Jiangsu Province urban and rural areas integrated urban and rural water supply technology integration and comprehensive demonstration" Important theoretical significance and engineering application value.Based on the analysis of the current three-dimensional modeling technology and the status of urban underground pipe network system,this paper studies the construction method and related algorithms of water supply pipe network model,and studies a rapid and automatic construction of existing two-dimensional pipe network data Modeling Method of 3D Pipe Network Model.Firstly,the data needed for 3D modeling of pipe network are extracted from the DXF file format of 2D pipeline CAD drawing.Then,by analyzing the spatial structure of pipeline,the mathematical model of pipeline is established by using cross section differential,and the method of subdivision of complex pipeline is proposed.And then establish a reasonable three-dimensional pipe network data model and data structure,through the format conversion WebGL supported by the JSON format of the three-dimensional pipe network model;and then through the three-dimensional terrain scene accelerated rendering algorithm to achieve the geographic information scene in the three-dimensional city architecture Automatic modeling,and finally,the integration of three-dimensional pipe network and geographic information scene to achieve WebGL-based three-dimensional network management system.In this paper,the advanced example of the algorithm is verified by modeling examples.The functions of the system are as follows:DXF file import and real-time modeling,scene browsing and user interaction,pipeline real-time data display and map layer transformation.Experiments show that WebGL-based 3D Geographic Information System can be used in the browser to achieve smooth rendering of three-dimensional scene,to provide users with a good three-dimensional visual experience.