全球多分辨率地形数据库的设计与实现

Design and Implementation of Global Multi- resolution Terrain Database

传统基于文件系统的地形可视化系统，面对海量数据具有很大局限性。利用空间数据库实现对海量空间数据的管理，当前已经成为主流技术。本文基于金字塔模型设计了全球多分辨率地形数据库，对数据文件进行有效合理的存取和管理，采用四叉树索引技术从全球多分辨率地形数据库中快速调度目标地形数据，提高实时渲染速度和仿真可信度，满足了用户实时需求。

The traditional terrain visualization system based on file system has significant limitations for great mass data. It has become a mainstream technique to utilize spatial database to realize massive spatial data management. The designed global multi - resolution terrain database based on pyramid model in this paper can access to and manage data file effectively and reasonablely. Using quadtree indexing technique can dispatch quickly targets terrain data from global multi -resolution terrain database. The database improves the real -time rendering speed and simulation credibility, and meets users＇ real- time needs.