鄱阳湖区域风场矢量的Web三维动态可视化  

Web 3D Dynamic Visualization of Wind Vector Field in Poyang Lake Area

作　　者：袁武彬 廖明伟 廖明 李平[1,2,3] YUAN Wu-bin;LIAO Ming-wei;LIAO Ming;LI Ping(Jiangxi Province Engineering Research Center of Surveying,Mapping and Geoinformation,Nanchang 330209;Key Laboratory of Watershed Ecology and Geographical Environment Monitoring,NASG,Nanchang 330209;Jiangxi Provincial Geomatics Center,Nanchang 330209,China)

机构地区：[1]江西省测绘地理信息工程技术研究中心,江西南昌330209 [2]流域生态与地理环境监测国家测绘地理信息局重点实验室,江西南昌330209 [3]江西省基础地理信息中心,江西南昌330209

出　　处：《地理与地理信息科学》2020年第1期22-26,共5页Geography and Geo-Information Science

基　　金：江西省重大生态安全问题监控协同创新中心专项(JXS-EW-012);国家测绘地理信息公益性行业科研专项(201512026);江西省科技计划项目(20171BBE50062)

摘　　要：针对风场动态可视化中数据获取不够实时、风场模型构建非动态且尺度单一、粒子风运动轨迹三维场景下渲染效率不高且难于交互等问题,该文基于矢量场及WebGL技术,提出了风场矢量的Web三维动态可视化方法体系。首先研究了风场数据后端动态抓取、解析及存储技术,对解析后的数据构建初始风场模型,并结合双线性插值算法构建可视化区域内多尺度动态风矢量场,然后通过粒子风的运动轨迹动态模拟变化趋势,建立了粒子从地理坐标至屏幕画布坐标的转换模型,并对运动的粒子进行生命周期管理以提升三维场景渲染效率。基于此方法体系研发了原型系统并开展实验分析,实现了对鄱阳湖区域风场环境的客观、实时、动态模拟,对于掌握湖区及周边风场数据有重要意义。Some inevitable problems occur in the process of dynamic visualization of wind field:1) data acquisition is not real-time enough;2) the process of constructing wind field is not dynamic and the scale of the wind field is single;3) the rendering process of particle wind in the 3 D scene is inefficient and difficult for interaction.To overcome these challenges mentioned above,we proposed a web 3 D dynamic visualization approach scheme based on the wind vector field and WebGL technique in this paper.We began with investigating the fetching,parsing,and storage technique of dynamic data for the wind field at the back-end.And then the preliminary wind field model was built,in combining with the bilinear interpolation algorithm,a dynamic wind vector field in the visualized area at multiple scales was established.Based on dynamic trend simulation of wind particle moving trajectories,the transformation model for projecting particle locations from the geographic coordinates to the screen canvas coordinates was established.In order to facilitate the rendering efficiency in the 3 D scene,the life circle management for the moving particles was implemented.According to the proposed methodology system,a prototype system was developed to extend the experiment analysis.This prototype system is capable of simulating the environment of nature wind field of the Poyang Lake area in an objective,real-time,dynamical way.This research is quite meaningful for monitoring the wind field data of both the lake and its surrounding area.

关 键 词：鄱阳湖区域 多尺度 风矢量场 动态可视化 粒子 

分 类 号：P425.3[天文地球—大气科学及气象学] P208