The near neighbor pair query of the datasets in the network has important application in geographical information systems, query in the network and spatial database.
网络环境下的数据集中的近邻对查询在地理信息系统、网络查询和空间数据库等领域有着重要的应用。
The multi-scale representations (multi-representations) for geographical entities is one of research focuses in the field of multi-scale spatial database.
对地理要素的多尺度表达（多重表达）是当前多尺度空间数据库领域的研究热点之一。
Based on geographical and spatial database and supported by computer hardware and software context, GIS implements to acquire, manage, operate, analyze, simulate and display spatial data.
它以地理空间数据库为基础，在计算机硬、软件环境的支持下，对空间相关数据进行采集、管理、操作、分析、模拟和显示。
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