Design And Implementation Of WebGL Based Geographic Information Big Data Visualization Platform

With the rapid development of information technology,human exploration of the earth is also constantly in the intelligent means to advance.Geographic information data used to describe the changing rules and spatial distribution of natural phenomena is also growing rapidly.The integration of geological research and big data forms a "massive amount of geographic information data" with "multiple heterogeneity,high capacity and low value density",especially the geological subsidence data reflecting the surface and land subsidence in urban construction,which has the characteristics of large capacity,time-varying and complex dimensions.How to use visualization technology to more intuitively serve the geological research analysis and problem decision-making has become a research hotspot in the field of visualization.Firstly,this paper summarizes and analyzes the characteristics of geographic information data and systematically introduces the relevant technologies and tools of current data visualization.Secondly,this paper analyzes the current research status of geographic information data visualization at home and abroad,and summarizes the current shortcomings and problems to be solved in view of the visualization of urban geological settlement in geographic information.Finally,a Web-side data visualization platform is designed and implemented.Based on the B/S architecture pattern,the visualization platform realizes a series of integration methods,such as data parsing,GIS service construction,and finally overlaying map layers for visual display.Cesium,which is based on WebGL,is used as the 3D rendering engine,and Geo Server is used as the map layer processing service.The two are combined to build a convenient and simple visualization platform.Based on this visualization platform,a method for visualization expression of monitoring results of geological subsidence deformation is designed.The color transition effect is generated dynamically according to a certain threshold interval,and the settlement deformation of the region is reflected according to the color change.At the same time,design and provide the corresponding personalized and customized visual display,such as the ability to customize the threshold interval to re-render the color presented by the overlay layer,pick up the data point element information,and draw the deformation rate change diagram,three-dimensional scatter diagram,three-dimensional surface diagram and other analysis charts through Echarts.js.Also provides convenient,concise data interaction function,convenient for users to operate and use.