Research And Implementation Of Spatial Analysis Method Of Urban 3D Underground Pipelne

In recent years,with the acceleration of urbanization in our country,the scale of the urban underground pipeline is rapidly expanding.For a long time,due to the relevant department responsibilities are not clear,leading to all kinds of accidents have occurred in the process of underground pipeline construction,operation and maintenance.These problems affect people's daily life,endanger the personal safety,but also cause serious economic losses.The most effective method to solve this problem is to establish the urban underground pipeline information management system,but the traditional two-dimensional information management system can not better display the spatial relationship between pipelines.In order to solve the problem,the urban 3D underground pipeline information management system emerges as the times require.This pager combining with the application demand in the field of underground pipeline,systematically studies the realization method of the spatial analysis function of urban 3D underground pipeline from five aspects:space measurement and calculation,spatial query,buffer analysis,network analysis and cross section analysis.It is intended to provide a reference for the construction of urban underground pipeline system.Based on the research of the characteristics and the data structure of the underground pipelines,it selects the multipatch model as the data model of 3D spatial analysis.In the space measurement and calculation,it uses ray projection method to optimize the ray intersection with triangulation algorithm to improve the efficiency of real-time inquiry coordinates;At the same time,it puts forward the method of min-distance based on pipeline space data model.In the buffer analysis,it studies the method of buffer generation for 3D model,and it solves the problem of buffer shown on the surface and surface transparency based on the DOM data.In the network analysis,it studies the determination method of pipeline flow direction,and uses the model texture mapping to indicate the flow direction;And,it discusses the application of genetic algorithm in solving the problem of pipeline connectivity,and uses the modified genetic algorithm to solve the individual fitness value.Finally,it designes and developes the urban 3D underground pipeline information management system based on study work,and mainly introduces and demonstrates the analysis function of spatial analysis module,which proves the correctness and practicability of the study results of this paper.