大规模海洋水文环境多维可视化技术研究  

Multidimensional Visualization Technology Research About the Large-Scale Oceanographic Environment

作　　者：曹柱[1] 苏天赟[2] 王国宇[1] 

机构地区：[1]中国海洋大学信息科学与工程学院,山东青岛266100 [2]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《中国海洋大学学报（自然科学版）》2017年第4期132-138,共7页Periodical of Ocean University of China

基　　金：中央级公益性科研院所基本科研业务费专项(2015P12);中央级公益性科研院所基本科研业务费专项(2015G18)资助~~

摘　　要：随着三维可视化技术在海洋环境仿真和信息表达方面的研究不断深入,在应用领域对海洋数据可视化结果的真实感、可视化过程中的实时交互性要求越来越高。基于GPU技术和OSG(Open Scene Graph)三维渲染引擎,研究OSG三维交互关键技术和体绘制渲染技术,开发一套面向大规模海洋水文环境数据的可视化软件,实现海洋要素场填色图、等值线绘制、等值面绘制、要素场体绘制和海流场动态模拟。为了更好的表达海量海洋水文环境数据的空间特性和实时性,在场景中建立节点对几何对象进行管理,引入回调机制实现动态渲染,加入CUDA(Computing Unified Device Architecture)并行计算提高计算速率,采用NetCDF(Network Common Data Form)文件格式对数据进行存取,应用GPU编程技术实现海洋水体环境要素快速体绘制。通过实践,开发实现的海洋水文环境可视化软件能够对海洋水体环境要素的属性和变化过程进行高效、直观的模拟和显示。Currently, ocean has been closely linked with the life of people. With the rapid development and utilization of marine resources, the research on visualization of marine information plays a more and more important role, which is very helpful for displaying internal laws and different relationships in the data. The features of marine environment can be reflected from many kinds of factors such as sea tem- perature, sea salinity, sea density, ocean current and so on. These data are time series, multi-dimen- sional, heterogeneous in structure and huge amount. The complexity of marine data and the require- ments of scientific research necessitate a specific tool that can provide dynamic visualization and analysis of marine information interactively and intuitively in 3D environment. It should be generic for marine da- ta sets and have high efficiency for mass data. So, multi-dimensional dynamic visualization of large-scale marine hydrological environmental data has become a hot topic of ocean research with the development of marine information technology. This paper tackle the challenge of key technology of three-dimensional interaction and volume rendering technology based on GPU technology, develops large scale marine hydrological environmental data-oriented visualization software and realizes oceanographic planar graph, contour line rendering, isosurface rendering, factor field volume rendering and dynamic simulation of current field. To express the spatial characteristics and real-time update of massive marine hydrological environmental data better, this study establishes nodes in the scene for the management of geometric ob- jects to realize high-performance dynamic rendering. The system employs CUDA （Computing United Device Architecture） parallel computing for the improvement of computation rate, uses NetCDF （Net- work Common Data Form） le format for data access and applies GPU programming technology to realize fast volume rendering of marine water environmental factors. The interactive framework of the

关 键 词：海洋环境 GPU OSG NETCDF 多维可视化 

分 类 号：P714.2[天文地球—海洋科学] P715