随着以WebGIS技术和移动GIS技术为基础的地图服务逐渐成为GIS行业的主流，地图产品要求建设成本低廉、网络传输速度快等特点，三维电子地图产品不能在现有网络环境下实现快速访问和浏览，基于侧轴投影的2.5维电子地图产品开始被人们所接受。2.5维电子地图除了继承二维电子地图在数据采集、分析与处理等方面的强大功能外，其直观和真实的空间表现能力，弥补了二维GIS图形表现的局限性。通过研究2.5维电子地图的制作方法，地图投影方式，构建2.5维电子地图的应用平台，对城市地理信息系统的应用和推广具有重要意义。 本文以乌市经济开发区卫星广场及周边地区为实验对象，通过二维地形图到三维场景建模，纹理采集到模型贴图，渲染出图到图幅拼接一系列流程，探讨了小区域快速构建2.5维场景的方法，对大范围城市2.5维场景的建立同样具有参考价值。分析了不同的地图投影对2.5维电子地图变形产生的影响，确定地图投影和坐标系，并对不同的地图配准方式进行了探讨。利用2.5维地图成果发布地图服务，结合ArcGIS Online提供的在线城市基础地图服务，对比ArcGIS Server平台下WebGIS二次开发的方式，采用JavaScript API的方式建立了一个基础的2.5维地图应用平台。在此平台的基础上对部分功能进行了设计和实现，为建立各种2.5维专题城市地理系统提供了有效的参考。

As the map service based on WebGIS and mobile GIS technology gradually becomes mainstream in GIS industry, map products need to be cheaper and fast in transmission speed, and 3D electronic map products can not realize fast access and browsing in current network, therefore 2.5D electronic map products based on oblique axis projection are becoming acceptable. 2.5D electronic map not only succeeds the powerful functions in analysis and processing and data collection of 2D electronic map, but also makes up for the disadvantage of presentation of 2D GIS map using its vivid and real spatial presentation ability. It’s significant for application and promotion of urban GIS using the application platform of 2.5D electronic map established through studying 2.5D electronic map production and map projection. This article uses satellite square and its surrounding area in Urumqi as the experimental object, through a series of procedures such as modeling from 2D map to 3D scene, texture collection, model decals, rendering and map splicing, studies the method of fast establishment of 2.5D scene of small area, has reference value for the establishment of 2.5D scene of large areas in cities, analyzes influence on 2.5D electronic map of different map projections, defines map projection and coordinate, and studies different map registration modes. It uses 2.5D map to release map service, integrates online urban basic map service provided by ArcGIS Online, compares WebGIS secondary development mode under the platform of ArcGIS Server, uses JavaScript API mode to establish a basic 2.5D map application platform, on the basis of which partial functions can be designed and realized, providing useful reference for establishing all kinds of 2.5D thematic urban GIS.