以组织、处理、管理和发布这些社会经济统计数据为目的的网络经济专题地理信息系统的研究逐渐的成为当前研究的热点。
The research of web economic thematic GIS whose intention is organizing, disposing, managing and publishing these economic data is becoming a promising trend.
环境地理信息系统作为地理信息系统的一个专题研究领域有其独特性。
Environmental geographic information system (EGIS) is a specific subject research domain in geographic information system with its peculiar characteristic.
本文提出了三维灰色地理信息系统（3DGGIS）理论，从基础存储层、技术支撑层和专题决策层等方面详细论述了研究内容。
The author gives the research hierarchy of 3DGGIS and dwells on the contents of basic model lever, middle technical lever and high thematic lever.
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