In order to reduce ulteriorly retrieving range for spatial information query and to raise query speed, the retrieving technology oriented class objects in two lev…
为了便于缩小空间范围，快速地进行空间查询检索，引入了面向类对象的分级查询技术，有效地提高了空间查询的速度。
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。
Besides the traditional functions, such as spatial information display, query, analysis, the system has the features of real-time positioning and navigation by the GPS technology.
该系统除了具有传统的空间信息显示、查询、分析等功能外，还利用现在迅速兴起的GPS定位技术，实现实时的定位导航功能。
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