基于Cesium时空三维可视化的数据调度与缓存机制

针对传统三维可视化技术存在数据调度速度慢、场景绘制效率低等问题，本文提出了一种绘制线程与调度线程并行的双线程数据调度策略。该策略将数据调入等待队列，根据视点距离进行顶点层次划分，再利用双线程渲染管线进行场景绘制。为了提升了三维场景处理速度，建立了二级缓存渲染机制与瓦片数据更新策略，并基于Cesium图形引擎，设计并开发了武夷山国家公园时空三维可视化系统，优化了三维场景绘制与数据调度性能，实现了国家公园多源数据集成，提高了虚拟场景中跨平台、跨终端三维展示与交互能力，为国家公园数字化建设提供了行业参考。

Research on Data Scheduling and Cache Mechanism Based on Cesium's 3D Visualization of Space and Time

In terms of the issues of slow data scheduling and low scene rendering efficiency in traditional 3D visualization technology, a dual-thread data scheduling strategy with parallel rendering threads and scheduling threads is proposed in this paper. The data was transferred into the waiting queue by this strategy, the vertex hierarchy was divided according to the view distance, and then the scene was drawn using the dual-thread rendering pipeline. In order to improve the processing speed of 3D scene, a second-level cache rendering mechanism and tile data update strategy were established, combined with Cesium graphics engine, a three-dimensional visualization system was designed and developed for Wuyishan National Park, and the performance of 3D scene rendering and data scheduling are optimized, meanwhile the multi-source data integration of the national park is realized. The ability of three-dimensional display and interaction in virtual scenes between cross-platform and cross-terminal are improved, it is provided as the industry reference for the digital construction of national parks.