Therefore, geographic data model based on relation typed database is established in developing information administrative system of nature reserves.
为此，在开发自然保护区信息管理系统时，建立了基于关系型数据库的地理数据模型。
Spatial data model is the core and base of three dimensional geographic information system design.
空间数据模型是地理信息系统设计的核心和基础。
This paper mostly introduce three issues of Vehicle Navigation System, that are navigation geographic database standard, data structure and data model, superior road.
本文主要介绍了汽车导航系统中的导航地理数据库标准、数据结构与数据模型、最优路径三个问题。
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