分布式栅格空间数据库引擎设计与实现

栅格空间数据库引擎RasSDE是实现海量栅格数据的分布式查询和高效管理的关键。提出一种面向对象的栅格空间数据组织模型,设计了分布式四层RasSDE的体系结构,分析了数据库服务层、应用接口层、应用层等相关技术,讨论了RasSDE核心组件OMSAC开放多数据源空间数据访问组件的架构,给出了基于RasSDE的中国海监飞机扫描仪图像处理及三维仿真平台应用系统实例,系统实现面向对象的栅格空间数据组织、统一的海量栅格空间数据管理以及分布式栅格空间数据计算等主要目标。对RasSDE和ArcSDE的磁盘读写、网络传输综合性能对比试验表明,RasSDE的栅格数据网络传输效率比ArcSDE的要高,可以满足海量栅格空间数据传输的要求。

Design and Implementation of Distributed Raster Spatial Database Engine

Raster spatial database engine(RasSDE) is a key technique to achieve distributed query and efficient management of massive rater data. An object-oriented raster spatial data organizing model is proposed. A distributed four-tired architecture of RasSDE is designed. Database services,application interface and appli-cation services are analyzed. Core component framework and its object classes of RasSDE are discussed. MAMS V2.0 system based on RasSDE is given. The main aims of the system are to realize the object-oriented raster spatial data organization,integrative massive spatial data management and distributed spatial data computing. The comparison experiments of disk read-write and network transmission synthesized capabilities between RasSDE and ArcSDE are performed. The results show that raster data network transmission efficiency of RasSDE is higher than that of ArcSDE,and RasSDE can satisfy the demand of massive raster spatial data transfers.