【作者】 何卫；

【导师】 王保保；

【作者基本信息】 西安电子科技大学 ， 计算机应用技术， 2004， 硕士

【摘要】 地理信息系统(GIS)是与计算机科学、地理、遥感、测绘、城市规划、土地管理、市政建设等诸多学科和相关产业部门相融合的交叉技术。WebGIS是指在Web上实现GIS功能。 论文分析了GIS从单机到网络化体系结构的演变和相应的关键技术，介绍了国际主流GIS产品的网络化现状。研究了地理信息的空间数据结构，并对空间数据库的特点和应用做了详细的分析。重点讨论了中间件技术在空间数据库的应用，并以ESRI公司的ArcSDE为基础平台，分析了空间数据的存储和管理。 论文阐述了地价管理GIS系统的概念、特点，以及意义。采用了Windows DNA的网络体系结构，通过合理的分层设计，实现了网络负载的平衡和无缝连接。利用GIS技术建立了地价信息的空间数据库，通过系统界面能够动态、直观地反映地价信息的时空分布规律，可为用户提供多种空间分析功能，并可为管理者提供空间决策支持。 最短路径是GIS应用中的主要问题之一。论文对GIS中最短路径理论和实现算法进行了分析和研究，特别是对传统的Dijkstra算法和启发式搜索算法A~*算法进行了详细的探讨，并说明了各自的特点及适用条件。 论文对于基于Web的地理信息系统的发展进行了探讨，指出了地理信息的编码方式和网络协议是WebGIS系统发展的关键因素。更多还原

【Abstract】 GIS(Geography Information System) is a kind of technology, which is combined with computer science, geography, remote sensing, city planning, mapping and land resource management etc. As a product of the development of GIS and information technology, WebGIS is to implement the functions of GIS in Web. With the rapid development of c/s computing mode and network computing, it lays a solid foundation for the implementation of WebGIS. Based on distributed computing platform and expressed by B/S structure, it is the path that GIS penetrates into daily life.The evolvement of architecture of GIS from stand-alone PC to network is analyzed in this dissertation, as well as according key technologies. It studies on the spatial data structure of geography information and analyzes the characteristics and application of spatial databases. The application of middle-wares in spatial database is discussed. Taken ArcSDE as example, which is produced by ESRI Corporation, it studies the storage and management of spatial data.In this dissertation, the conception, characteristics and significance of land value management GIS system is introduced. The network architecture of Windows DNA is adopted in the implementation. With the layer divided properly, it realized the balance of payload and seamlessly connection. Land price management GIS system of Shaanxi province is established with the technology of GIS and it provides dynamic and comprehensible land price information. It provides the policy-makers useful information.Shortest path is one of the major problems in the application of GIS. The theory and algorithm of shortest path in GIS is studied in the dissertation. Especially, the traditional Dijkstra algorithm and heuristic search algorithm are discussed as well as their own characteristics and conditions.At the end of the dissertation, the development of WebGIS is reviewed, and it indicates that coding modes of geographical information and network protocols are the key factors in the development of WebGIS in the future.更多还原