Research On Rapid Construction Method Of 3D Line Scene Based On Linear Referencing Model

With the development of science and technology and the advancement of technology,two-dimensional visualization can no longer meet people’s understanding and cognitive needs of geographic space.The three-dimensional scene not only can vividly reflect the real world and make people feel as if they are there,but also can combine GIS analysis functions to provide a basis for auxiliary decision-making in related fields.Lines include railways,roads,power lines,etc.The three-dimensional visual display and management analysis of the line are of great significance to improve the management level and work efficiency of the relevant departments.Scholars at home and abroad have conducted extensive research on the construction of three-dimensional line scenes and achieved fruitful results.However,the current research on the construction of 3D line scenes mostly uses traditional manual modeling methods and GIS model-based construction methods,which is not conducive to the linear expression of scenes,and there is a problem that the scene construction efficiency is not high.At the same time,at the level of visualization and semantic expression of 3D line scenes,the existing 3D model data standards lack geometric and semantic standard specifications in the line field,reducing the standard and standardization of the scene.Therefore,how to efficiently construct line scenes and provide rich and accurate scene semantic information is an urgent problem to be solved.In view of the above problems,this paper designs a rapid 3D linear scene modeling method based on linear reference model,and builds a 3D railway scene based on this method.The main contents of this study are as follows:(1)According to the linear characteristics of the three-dimensional line scene and the characteristics of its spatial data expressed in a linear manner,a linear reference model is designed to make up for the shortcomings of the traditional Web GIS geographic coordinates to describe the position information of the line,and realize the mutual relationship between the one-dimensional linear coordinates and geographic coordinates Transform and generate line layers to lay the foundation of data model for scene construction.(2)Adopt symbolic modeling to summarize the characteristics of structural equipment in the reality of line scenes,abstract and simplify scene objects,and uniformly express a class of equipment in the form of three-dimensional symbols to improve the efficiency of building three-dimensional line scenes;Establish a three-dimensional symbol library system,use the database to store and manage symbol models and geographic information data,and improve the model utilization rate.(3)Drawing on the City GML idea,establishing the multi-level expression rules of symbols under the linear reference model;taking advantage of the BIM standard in semantic expression,taking the railway as an example,combining the railway engineering information model to expand the IFC standard It provides information on the entire life cycle of railway equipment.Finally,the extended semantic mapping rules of City GML and IFC are established to meet the modeling needs of 3D line scenarios under the linear reference model,and provide a reliable basis for decision-making analysis of related departments.