【作者】 李治柱；

【导师】 王志宏；

【作者基本信息】 上海交通大学 ， 高可靠性软件开发， 2009， 硕士

【摘要】 数字地图通俗地讲就是将地图上的所有内容和信息在计算机环境下生产、制作和应用,以数字的形式来组织、存储和管理的地图。它在计算机中的表示和存储形式为一组数据,由坐标位置、属性编码和一定的数据结构所组成,在计算机屏幕上和输出设备上则表现为色彩鲜艳、直观的地图。数字地图具有动态性,其内容和表示效果能够实时修改,内容的补充、更新极为方便。数字地图的组织较为灵活,所提供的信息能够用于统计分析,进行辅助决策。在新的技术支撑下,还能够实现将数字地图的内容与图像、声音、文字、录像等内容结合在一起,生成更富表现力的多媒体数字地图。数字地图具有强大的空间查询、空间分析及属性管理功能。随着人们对数字地图需求的增长,把数字地图系统与网络技术相结合,在网络上发布空间数据,为用户提供空间数据浏览、查询和分析的功能,从而形成一个网络化的地理空间集成平台,已经成为数字地图发展的必然趋势。本文首先从数字地图数据整合技术的研究入手,在分析国内国外数字地图系统建设现状及发展趋势基础上,研究阐述了地理信息集成及相关数据库建立的重要性和必要性;对数字地图集成中应用到的理论和关键技术进行了深入的探讨,对数字地图数据构成的特点进行了分析;并以一个client/server(简称C/S)模式下的数字地图系统为例,详细介绍了开发该系统所用的关键技术和解决方案,这些关键技术如:地理数据的采集和录入、空间数据库的设计建立、栅格地图的矢量化、数据的绑定、图层的逐层细化、鹰眼技术、以及地图文件的自动生成等。随后,论文描述了数字地图系统的总体设计,给出了系统必需的软、硬件环境以及系统的功能需求。在此基础上实现了客户端与服务器端地理数据交互,以及数字地图的地图操作功能,使用户在信息管理平台上结合地理信息功能完成对普通地理对象的操作,实现了地图显示、地图缩放、图层控制、专业查询、编辑(删除、添加、修改)地理对象等功能;最后,根据数据库系统的安全模型,进一步分析了SQL Server数据库使用中的安全性,对于各种可能存在的安全隐患,提出了具体的解决方法和建议,并指出了系统需要改进的地方,为继续完善本系统提供了参考意见。更多还原

【Abstract】 Digital map produce and apply all the information in the map on computers, that is, digital map organize, store and manage the map information digitally. Digital map, which are composed of coordinates of locations, attribute coding and certain data structure, are displayed and stored in the computer as a set of date. They are also displayed on the monitor and printer as colorful intuitive map.Digital map are dynamic, for their contents and effect can be modified at real-time. Digital map are flexible, for their information can be applied in statistical analysis and decision making. Digital map are expressive, for their details can be combined with graphs, sounds, words and videos to provide multi-media digital map. Digital map is able to support various functions such as spatial query, spatial analysis and attribute management. With the continuous advancement of Internet technology and increasing demands for Digital map, integrating of Digital map and network technology, publishing spatial data, providing spatial data display, query and analysis functions to users become the inevitable development trend to Digital map.The paper starts with the study for technology used in integrating digital map, analyzes the current situation and promising trend home and abroad in applying digital map, and elaborates on the theories and technologies of developing digital map. The paper takes the digital map in the mode of C/S as an example to illustrate the main issues in setting up the digital map and their solutions. These main issues include the collection and entry of geographical information, the design of spatial database, vectoring grid map, binding data, detailing map layer, hawk-eye technology, and creating map files automatically. The system accomplishes network access from client to server and achieves multiple functions, the users complete operations of the geographic objects in the management information platform with functions of Digital map and the system achieves map display, map zoom, layer control, professional query, editing(deleting, adding, modifying) geographic data and so on. The paper also introduces the process of designing digital map and their demands for software, hardware and operating system; according to the database system security model, the paper discuses the security problem in SQL Server database. It also analyzes security problems that may exist and offers some specific solutions an d suggestions to enhance database users’security consciousness. At last the paper ends with some suggestions for certain improvements in the digital map.更多还原