在嵌入式internet gis中的gps数据整合 英文原文及翻译.doc

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在嵌入式internet gis中的gps数据整合 英文原文及翻译,integrating gps data within embedded internet gisarunas stockus alain bouju frédéric bertrand patrice boursieruniversity of l a rochelle - l3iavenue marillac170...
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Integrating GPS Data within Embedded Internet GIS
Arunas STOCKUS Alain BOUJU Frédéric BERTRAND Patrice BOURSIER
University of L a Rochelle - L3i
Avenue Marillac
17042 La Rochelle - FRANCE
Tel. +33 (0)5 46 45 82 62
{arunas.stockus, …}@univ-lr.fr
1. INTRODUCTION
An embedded geographic information system (GIS) is a specialized system that could mostly be considered as a mobile navigation system. Its typical characteristics concern the presentation of geographical information to the driver, positioning and guidance. However, due to their reduced computational power and their autonomy, many actual navigation systems have some limitations. The geographical information they can use covers only limited areas, and its precision may be insufficient in some situations. The autonomy of the system complicates data updates and access to distant information sources, especially those providing dynamic information.
But the actual development of technologies changes the way information can be accessed and processed. It minimizes the differences between desktop applications and embedded ones by bringing the power of desktop computational technologies into mobile devices. It gives the possibility to use the same kind of applications and data access modes with both kinds of environments: presentation of multimedia information, connection to the Internet, etc.
In this paper we present an embedded GIS, which is based on such technologies. Its architecture is a client-server one, and the system components may give access in real time to distant information servers. We use a satellite based localization system(GPS) for the geographical positioning of a mobile unit (e.g. avehicle). The connection to distant data servers at the physical level is based on the use of a cellular phone. At the software level, we use an Internet connection for exchanging data between the components of the system. Information integration, visualization and processing is made possible by using a Java enabled Web browser and a Java applet.
在嵌入式Internet GIS中的GPS数据整合
1. 绪论
嵌入式地理信息系统(GIS)通常被认为是移动导航系统。它的典型特征是给驾驶员提供地理信息显示、定位和导航功能。但现有的导航系统都有一定的局限性,主要表现在计算能力和自动性不足上。这些导航系统只提供了有限区域内的地理信息,而且这些地理信息的精度不能满足有些情况要求。系统的自我管理使数据更新和对远方数据特别是动态数据的访问,变得更加复杂。移动系统和数据服务器通讯时用到的特殊技术要求安装特殊的装置,这限制了它的应用。
但实际技术的发展改变了数据的访问和处理方式。它通过赋予移动设备和台式机类似的计算能力,缩小了台式机和嵌入式的应用软件的差别。使得在两种环境中运用相同的应用软件和数据访问模式成为可能,如,多媒体信息显示,Internet连接等。
在这篇文章中,我们介绍一个用上述技术实现的一个嵌入式GIS。它是客户机—服务器模式的,且系统各成员可以实时访问远程信息服务器。我们通过卫星定位系统(GPS)来得到移动终端(如,车辆)地理信息。在物理方面,移动终端和异地数据服务器的连接是通过手机来实现的,在软件层次上利用Internet连接,来实现系统不同成员间数据的交换。通过一个Java网络浏览器和Java程序可实现信息的综合,可视化和处理。
在我们系统构成中还有一个嵌入式本地服务器。它的主要目的是保证在最佳时间实时访问其他数据源:(i)本地的,如GPS设备发送的数据,和(ii)异地的,如在异地服务器上的空间数据数据库中的数据。
在下面的章节中,我们将介绍我们工作的框架,即对嵌入式GIS的要求和可能的技术处理方法。我们还将介绍我们的选择和由此导致的问题:访问和综合不同数据源的数据,尤其是GPS设备提供的。接着我们比较不同的解决方式,得出我们的选择。