基于地理信息系统的先进技术，采用VC++开发了一个地理信息系统通用软件，能实现城市地图信息的采集、城市电子地图多图层显示、城市路网的最优路径搜索，空间信息查询等。-Geographic Information System based on advanced technology, using VC++ Developed a geographic information system common software, to achieve a city map information coll