铁路地理信息系统中海量空间数据组织及分布式解决方案

铁路地理信息系统采用分布式空间数据库系统和技术实现海量空间数据的组织、管理和共享。提出中心、分中心、子中心三层空间数据库分布存储模式,实现空间数据的全局一致和本地存放。铁路基础图库主要包括不同比例尺下的矢量和栅格数据。空间数据库的访问和同步采用复制和持久缓存。复制形成主从数据库结构,从数据库逻辑上是主数据库全部或部分的镜象。持久缓存是在本地形成对远程空间数据的部分缓存,本地所有的请求都通过持久缓存来访问。

Massive Spatial Data Structure and Distributed Resolution to Railway Geographic Information System

This paper describes the organization, management and sharing of massive spatial data using distributed spatial database in Railway Geographic Information System (RGIS). A three-tier model including the center, sub-center and child-center is proposed. The spatial data is consistent in the whole and can be locally kept. The basic railway spatial database is consists of vector and grid data with different scales. Replication and persistent cache is adopted to access and synchronize the spatial database. Replication maintains a replica database of a master database. The replica database can be a full or partial mirror image of a master database. Persistent cache preserves part of remote spatial data. And all of local access requests are passed to persistent cache.