Cesium环境中三维场景数据的加载优化策略

Loading Optimization Strategy of 3D Scene Data in Cesium

三维模型是三维GIS重要的数据支撑,在三维GIS不断发展的同时,数据也趋于海量化,而针对三维场景的加载优化研究还亟待突破。本文选取了三维地球引擎Cesium进行了实景三维地图的开发,在原型系统上展开了三维场景的加载优化的研究。根据Cesium的数据组织和加载机制,通过参数的调优和组合,提出了一种“渐进式按需加载”的优化策略,这种优化策略既能大幅度减少加载所需时间,又能兼顾一定的视觉质量。

The 3D model is the important data support of 3D GIS.In recent years,with the continuous development of 3D GIS,data tends to be massive,but the research on loading optimization of 3D models needs to be broken through.In this paper,a series of researches are carried out on the Cesium,a 3D Earth engine based on WebGL.According to the data organization and loading mechanism of Cesium,an optimization strategy of“progressive loading on demand”is proposed.This optimization strategy can not only greatly reduce the loading time,but also take into account certain visual quality.