The improvement and innovation of electronic technology, information technology, computer technology, multimedia technology and so on, provides the power of the innovation and the space of the technological upgrading for the acquisition, transmission,procession, analysis and expression of the spatial information. As one of the products of spatial information visualization, the electronic map is widely applied to the public and to all walks of life in various forms, then it is quickly developed and humans have achieved a lot in this field.% 电子技术、信息技术、计算机技术、多媒体技术等的不断发展和革新,为空间信息的获取、传输、处理、分析与表达提供了创新动力和技术升级空间。电子地图作为空间信息的可视化产品之一,以不同层次的多种形式广泛应用于公众及各个行业领域中,从而得到了迅速的发展,并取得了巨大的成就。
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