The paper finish building channel geographic information data base, through demand analysis, conceptual design, logic design, physical design, data base model building and a series of step.
通过需求分析、概念结构设计、逻辑结构设计、物理结构设计以及数据库模型的建立等一系列步骤，最终完成了航道地理信息数据库的建设。
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。
GIS based farming information system approach which used geographic data base to analysis farming information was discussed and an instance was showed in detail.
提出了一种基于GIS的农牧业信息系统思想，把农牧业信息统一到地理数据库中进行分析处理，并给出了一个基于GIS的系统设计与开发实例。
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