【作者】 张瑞江；

【导师】 齐华；

【作者基本信息】 西南交通大学 ， 计算机应用技术， 2006， 硕士

【摘要】 近些年来,计算机、移动通信、网络技术的发展,为传统的GIS带来了新的发展契机。传统的GIS从基于桌面PC的单机GIS系统发展到基于客户服务器的网络GIS。目前,GIS正朝着新的发展趋势一移动GIS迈进。 移动GIS集地理信息科学、计算机科学、移动通信技术和网络技术于一体,是GIS发展的主要方向之一。设计移动GIS系统满足移动用户的需求已经成为一个新的研究课题。本文针对已有的象素位图表达地图的移动GIS系统的诸多缺点,提出将Mobile SVG规范应用到地图的表达,并借助J2ME、J2EE、XML技术设计与实现了移动GIS的新的开发框架模式,其主要工作和成果如下: ● 研究了利用Mobile SVG规范中对象元素表达地图,以适应移动GIS客户端的需要。 ● 为了提高异构空间数据的融合、系统可移植性的需要,研究了基于XML的地理空间数据表达及其传输技术。 ● 研究了利用成熟的JAVA技术、XML技术设计移动GIS的开发框架。 ● 结合J2EE技术设计服务器端系统总体框架的优势,分析设计了基于J2EE技术的系统总体框架。 ● 客户端设计了适合支持JAVA手机终端的客户端系统框架。 ● 按照服务器端系统框架,设计实现了相应的逻辑功能组件,满足客户端的空间分析请求。 ● 按照客户端系统框架,设计实现了客户端相应的逻辑功能。 ● 通过实验结果表明利用Java/Mobile SVG开发移动系统同传统的移动GIS系统相比具有以下优势: ● Mobile SVG表达的空间地图较基于象素的地图占有的数据量小; ● Mobile SVG表达的地图进行缩放操作时不存在失真现象; ● 基于XML的空间数据表达,有利于空间数据的交换; ● 基于企业级的多层体系结构,具有系统稳定、可移植等多方面的优势; ● 基于Mobile SVG的客户端解决方案,有利于解决客户端与服务器端的负载平衡问题。更多还原

【Abstract】 In recent years, the development of the computer, the mobile communication and the network technology brought the recent development turning point for traditional GIS. Traditional GIS has developed from single plane GIS system of tabletop PC to Web GIS based on client and server, and now GIS is stepping towards Mobile GIS.Mobile GIS collects methods of geography information science, the computer science, the mobile communication technology and the network technology, and it is one of main directions of GIS. Designing mobile GIS system to satisfy the demands of the mobile clients has become a new research topic. In order to solve the problem of mobile GIS based on pels bitmap’s expressing map, the standard of Mobile SVG is applied to the map expression. In this paper, J2ME, J2EE and the XML technologies are used to realize a new framework of Mobile GIS. The principal content and achievement in this article is as follows:How to utilize object element in the standard of Mobile SVG to express map is studied to satisfy the needs of the client side of Mobile GIS.In order to enhance the fusion of different space data, and satisfy the system’s transplant, geography space data expression based on the XML and its transmission technology are studied.The mature JAVA technology, XML technology are used to design a developing frame of Mobile GIS.The system’s total frame is designed, which has the superiority of the J2EE in server side.At the client side, the system frame of client side is designed to support the JAVA handset terminal.According to the server terminal system frame, the corresponding logical function components are designed to satisfy the spatial analysis request at the client side.According to the client system frame, the corresponding logicalfunction components are designed at the client side. Compared to the traditional mobile GIS, the experimental result has indicated that the Mobile system which is designed by Java/ Mobile SVG has the superiorities as follows:? Compared to the map of pels, the spatial map expressed by Mobile SVG has smaller data.? The map expressed by Mobile SVG does not have distortion phenomenon during the zoom operation.? the spatial data expression based on XML has the superiority of spatial data’s exchange.? The enterprise multilayered system structure has the superiority of system stability and transplant.? The client side solution based on the Mobile SVG can solve the load balance problem between the client side and the server side.更多还原