基于传输函数的二/三维全时空连续海洋中尺度涡旋流场实时可视化

Real-time visualization of 2D/3D full spatiotemporal continuous ocean mesoscale eddy fields based on the transfer function

海洋中尺度涡旋可视化可以将海洋中尺度涡旋的运动规律以图形图像等直观的方式加以展现,是研究海洋中尺度涡旋强有力的工具。然而,现有的可视化方法存在一些不足,如时空连续可视化框架中的流线不能表现全时空连续的运动过程,应用到海洋涡旋提取的特征值受阈值影响严重,交互式传输函数依赖用户经验等。为解决已有的不足,本文首次提出了全时空连续框架和传输函数标准形态模式,将基于区域的涡旋提取技术(Ω准则)应用到海洋中尺度涡旋可视化中,并提出了全时空连续可视化框架二维及三维的GPU实现方案。实验结果表明,本文的可视化方案达到了实时可交互的级别,对于海洋中尺度涡旋交互式可视化具有重要意义。

Ocean mesoscale eddy visualization can reflect the motion law of ocean mesoscale eddies in graphical images and other intuitive ways,which is a powerful tool for studying marine mesoscale eddies.However,existing visualization methods suffer from shortcomings.For example,the streamlines in the spatiotemporal continuous visualization framework cannot represent the continuous motion process of the entire spatiotemporal region,feature values applied to the extraction of ocean vortexes are severely affected by the threshold,and interactive transfer function relies on user experience.Therefore,to address these issues,this paper proposes a full spatiotemporal continuous framework and a standard morphological model of the transfer function for the first time.The region-based vortex extraction technology(Ωcriteria)is employed for the visualization of marine mesoscale eddies.Further,this paper proposes a two-and three-dimensional graphics processing unit(GPU)implementation scheme of the whole-spatiotemporal continuous visualization framework.Experimental results show that the proposed scheme achieves the visualization of real-time interaction,which is of great significance for the interactive visualization of marine mesoscale eddies.