基于WebGL的航道数据组织与三维可视化方法

A Method for Channel Data Organization and 3D Visualization Based on WebGL

针对Web端进行航道构建与三维可视化时遇到的海量数据组织困难、即时显示效率低的问题,提出了一种多维度数据索引构建方法,利用多层次网格索引将空间分布特征和时空关联关系索引到数据中,实现了海量水深数据的快速增量入库和高效检索;提出了一种基于边界约束的航道地形模型构建方法,利用alpha-shape算法提取自适应边界,并对Delaunay三角网进行优化,实现了航道三维地形模型的快速构建;设计了基于Web图形库(Web graphics library,Web-GL)的航道三维地形模型显示流程,利用可编程渲染管线在图形处理器(graphics processing unit,GPU)上进行运算和渲染,实现航道三维即时可视化。实验结果表明,该方法可用于Web环境下的航道数据组织和三维可视化。

To address the problems of difficult organization of massive data and low efficiency of instant display when constructing channels and visualizing them in 3 D on the Web side,we propose a method for multi-dimensional data index construction,and exploit multi-level grid index to index spatial distribution features and spatio-temporal correlations into data to realize the fast incremental entry and efficient retrieval of massive bathymetry data A method of constructing channel terrain model based on boundary constraints is also presented,which uses alpha-shape algorithm to extract adaptive boundaries and optimize Delaunay triangle network to realize the rapid construction of channel 3 D terrain model Moreover,we design a channel 3 D terrain model display process based on Web graphics library(WebGL)The programmable rendering pipeline is used to compute and render on graphics processing unit(GPU)to realize instant 3 D visualization of channel Experimental results show that the proposed method can be applied to organization and 3 D visualization of channel data in Web environment.