Design And Implementation Of 3D Virtual Reconnaissance And Remote Sensing Interpretation System Based On WebGL

Three-dimensional virtual surveying and remote sensing technology is a research hotspot in the railway industry information construction,and an important means of railway engineering survey and design.In recent years,the Internet of Things technology,3S technology,and UAV remote sensing technology have been continuously improved,expanding the application scope and depth of geographic information systems and remote sensing technologies.However,in the railway survey and design,there are still problems such as the cumbersome three-dimensional virtual survey construction technology,the lack of application of new remote sensing sources,the low efficiency of manual interpretation,and the inability of the software platform to meet the demand.Therefore,this paper proposes a method based on WebGL to construct a three-dimensional virtual survey and remote sensing interpretation system for railway.This paper systematically analyzes the requirements of virtual exploration and remote sensing interpretation of railway engineering geological survey,and studies the theory,technology and method related to virtual exploration and remote sensing interpretation,and explores the technical route and method of three-dimensional virtual exploration and remote sensing interpretation based on WebGL.Based on this,a WebGL-based railway three-dimensional virtual tracing and remote sensing interpretation system was constructed.Firstly,the thesis studies the requirements of three-dimensional virtual exploration and remote sensing interpretation of railway,and summarizes the requirements of three-dimensional exploration scene construction,scene browsing,engineering geology remote sensing interpretation,spatial analysis and data management.On this basis,the design scheme of the system overall,function module and database is summarized.The system adopts B/S architecture,including 3D terrain construction,railway scene construction,3D scene browsing,bad geological information extraction,spatial analysis and other functional modules.Then,the technical solution is designed in detail according to the design scheme.After that,it introduces the data and data preprocessing and data release process,3D modeling method and railway line midline data calculation method,and engineering geological interpretation data creation,storage and management methods.The paper then introduces the processing methods of key system technical problems,including WebGL-based 3D scene construction method,ArcGIS API for JavaScript and Three.js integration method.The method of model rotation when terrain and railway scenes are merged and the method of avoiding jitter of 3D model by selecting local origin are described in detail.At the end of the paper,the realization of the three-dimensional virtual survey and remote sensing interpretation system of railway is introduced,and the functions of each module of the system are demonstrated in detail.