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洪水演进三维动态可视化方法研究与应用

Research and Application of 3D Dynamic Visualization Method for Flood Evolution

  • 摘要: 将洪水演进过程三维动态可视化表达,能够为洪水灾害的预防和抢险救灾提供理论依据和决策支持。二维洪水淹没水深图能够确定需要重点防范的位置,但展示效果不够立体、直观;基于Cesium三维地形引擎,利用其动画实现语言(CZML),能够立体、动态展示洪水淹没过程,但数值模拟结果造成计算单元离散化,较大程度地影响用户观感,且淹没网格的实时加载及渲染造成一定程度的页面卡顿;结合HTML5新标签Canvas技术对淹没网格作为整体均匀过渡着色,采用后台缓存的方式减轻前端渲染压力,能够大大改善洪水演进可视化效果,提高用户体验。

     

    Abstract: The three-dimensional dynamic visualization of flood evolution can provide theoretical basis and decision support for flood disaster prevention and rescue and relief. The flood depth map of two-dimensional can determine the position that needs to be guarded against,but the display effect is not stereoscopic and intuitive enough. Based on Cesium 3 D terrain engine,CZML can display the flood inundation process in a three-dimensional and dynamic manner. However,the numerical simulation results cause discretization of computing units,which greatly affects the user’s perception,and the real-time loading and rendering of the flooded grid results in a certain degree of page lag.Combined with the new technology of HTML5 named Canvas,the inundated grid is uniformly colored as a whole,and the front-end rendering pressure is reduced by the way of background cache,which can greatly improve the visual effect of flood evolution and improve user experience.

     

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