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。
The Map Symbol Base System is not only one of the basic functions of Geographic Information System, but also an important research issue in GIS.
地图符号库系统不仅是地理信息系统中不可缺少的基础功能模块之一，也是GIS的一个重要研究课题。
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。
Military Geographic Information System symbol is the base component of the MGIS, it's necessary to research the method of the MGIS symbol producing and controlling.
本文围绕MGIS符号的分类及其结构、生成方法和控制策略问题进行深入的分析、研究。
Military Geographic Information System symbol is the base component of the MGIS, it's necessary to research the method of the MGIS symbol producing and controlling.
本文围绕MGIS符号的分类及其结构、生成方法和控制策略问题进行深入的分析、研究。
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