嵌入式GIS/GPRS集成开发平台的研究实现

【作者】 邢厚子；

【导师】 贾智平；

【作者基本信息】 山东大学 ， 计算机系统结构， 2006， 硕士

【摘要】 计算机的发展已经进入移动时代，以掌上电脑为代表的普及计算(Pervasive Computing)式系统日益深入人们生活，在移动中实时获取信息、使用信息，以及将移动主体通过无线网络与庞大的地理信息空间和数字空间动态的无缝结合不再是梦想。 本论文的研究目的是利用正在蓬勃兴起的普及计算技术，结合移动地图(Mobile Map)技术，开发适合个人用户的嵌入式地理信息系统(Embedded GIS，eGIS)，及基于通用分组无线业务(GPRS)移动通讯网络，构建移动空间信息的可视化系统，该系统不仅具备在手持设备上进行空间信息显示、查询、分析的功能，更重要的是提供地理信息系统基础数据的动态更新和无线下载；根据GPRS网络的现状和嵌入式特点，对eGIS中数据采用基于字典的方法进行压缩，然后通过GPRS传输和在嵌入式设备上存储。本论文研究涉及的主要技术包括测绘领域的地图数据库，空间数据分析、地图投影、全球卫星定位和计算机领域的嵌入式开发、移动计算、GPRS无线网络、矢量数据无损压缩等技术。 论文在分析国内外eGIS应用研究现状的基础上，概括出这一领域存在的缺点和不足，针对不足提出本课题所研究的内容，包括以下四个方面：(1)基于GPRS网络的GIS平台架构；(2)μClinux环境下开发eGIS软件的关键技术，包括系统平台和应用软件的设计与实现；(3)在嵌入式系统上实现GIS矢量数据的压缩；(4)GIS数据的空间分析算法在嵌入式环境下的改进。由此，提出嵌入式GIS系统平台的总体架构、逻辑层次和硬件组成，重点研究了基于SAMSUNG 44BOX的嵌入式GIS系统建立，设计并实现了GIS应用软件、GPRS无线通讯，并结合GPS定位给出试验结果。 在系统实现的过程中，对eGIS开发中的关键理论技术进行探讨，包括基于字典的无损压缩技术、地图投影变换方法和地理信息数据分析，重点研究地理信息数据的空间分析，对Dijkstra最优路径算法在嵌入式系统上进行了改进，使得网络数据的存储结构更加适合在嵌入式系统上的应用，并给出程序运行结果。最后，总结概括全文，并对嵌入式GIS的发展进行展望。更多还原

【Abstract】 Development has entered the era of mobile computers, notebook computers represented in Pervasive Computing system is increasingly deepening people’s lives. In real-time, mobile access to information, using information , as well as seamless integration of the mobile carrier and huge geographic information space, digital spatial through wireless network dynamically is no longer a dream.The purpose of this paper is, using prosperous Pervasive Computing technology, combining Mobile Map technology, to develop an embedded geographic information system (eGIS) suitable for individual users, and build a spatial information visualization system, based on General Packet Radio Service (GPRS), a mobile communications network. The system has satisfied the visualization, query and analysis of spatial information. Besides it is more important to provide a dynamic update and wireless downloading for basic GIS data. According to the current situation of the GPRS network and an embedded feature, compresses the eGIS data based on the methodology of dictionary, and then transmission through GPRS and storage in an embedded system. The research of the paper involves the science of surveying and mapping, including map database, spatial data analysis, map projection, global satellite positioning, and the computer science, including the embedded developing, mobile computing, GPRS wireless networks, lossless compression of vector data technologies, and so on.The research status quo of applied eGIS home and abroad is analysed in this paper, based on which , the shortcomings and deficiencies are outlined in this area. Response to those deficiencies, the research contents of this subject are proposed here, which includes the following four areas : (1)the GIS platform framework based on GPRS network;(2)the key technologies of eGIS software development under μClinux environment, including system platform and application software design and implement;(3) compression of GIS vector data in the embedded system;(4) improvement of the GIS data space analysis更多还原