基于虚拟地球的流场三维动态可视化方法

水文气象灾害是影响我国的主要自然灾害之一。水文气象网格数据构成一个动态变化的三维流场,流场可视化是研究水文气象灾害内在变化规律的重要手段。针对水文气象场数据数据量大、多维多尺度以及动态变化等特点,本文提出了一种基于虚拟地球的流场三维动态可视化方法。该方法包括流场数据组织和动态数据插值两种数据处理方法,并在此基础上研究了改进的粒子追踪、三维流线和体绘制三种可视化关键技术。最后通过河道洪水和台风两种不同尺度的流场进行了实验验证,结果表明该方法能够流畅地实现三维流场的精细动态可视化,对于水文气象灾害应急辅助决策具有重要的意义。

3D Dynamic Visualization for Flow Fields Based on Virtual Globe

Hydro meteorological disasters are one of the major natural disasters affecting China. Hydro meteorological grid data form a dynamic three dimensional flow field. The visualizing flow field is important to explore the inherent variation of hydro meteorological disasters. Considering the data characteristics of large amount, multi dimensional, multi scale and dynamic changing, this paper presents a 3D dynamic visualization method for flow fields based on a virtual globe. It includes two data processing methods: flow field data organization and dynamic data interpolation. Meanwhile, three improved visualization techniques including particle tracking, 3D streamline and volume rendering are studied. Finally, the method is verified by two different cases: river flood and typhoon. The experiments show that the method can smoothly realize the detailed dynamic visualization of the three dimensional flow field, which is of great significance for emergency decision making of hydro meteorological disasters.