共查询到19条相似文献，搜索用时 93 毫秒
1.
手机定位服务与电子地图 总被引：2，自引：0，他引：2
随着电信与移动通信公司新一代网络的开通,数据业务将变得非常重要,其中以移动用户位置为中心的信息服务成为关键内容之一.在手机定位服务中,必须通过电子地图系统将获取的终端位置转换成用户真正关心的地理信息.首先介绍了手机定位服务的概念及常用的手机定位方式的特点,分析了手机定位服务中应用布尔莎模型进行WGS-84坐标系到地图坐标系的转换方法,阐述了手机定位服务可提供的功能和手机定位服务中电子地图需要具备的功能.最后,分析了手机定位服务存在的缺点和使用中有待解决的问题. 相似文献
2.
3.
在110指挥系统中,为了实现对GPS巡逻警车的监控,必须将GPS终端接收到的位置信息动态显示在电子地图上。GPS数据采用WGS-84坐标系,而电子地图往往采用北京54坐标系,因而,如何将WGS-84坐标转换为北京54坐标成为系统必须解决的一个关键问题。本文详细讨论了WGS-84坐标与北京54坐标的转换问题,给出了详细的算法,并在福州市公安局110指挥系统中得到了成功应用。 相似文献
4.
5.
车辆监控系统需要在电子地图上显示车辆的准确位置,其核心技术是将车载GPS接收机的定位信息反映到电子地图上。通过地图投影和一定的数据变换,使GPS坐标与电子地图坐标统一匹配,可以实现从实际位置到图上位置的实时显示。 相似文献
6.
ITS(智能交通系统,Intelligent Transportation System)中GPS定位结果是WGS-84空间直角坐标．电子地图则采用西安80(或北京54或当地任意)坐标系的高斯平面坐标,为了将GPS定位结果实时在电子地图上显示出来,需要进行坐标转换。针对中小城市的特点,在总结各种坐标转换的基础上,提出了一种简化实用的坐标转换方法,基于这种方法,可以构建适用于中小城市廉价高效的ITS． 相似文献
7.
介绍车载导航定位系统的组成,比较几种导航方法的优缺点,得出几种较为合理、精度较高的组合定位方法.GPS卫星信号所包含的定位信息有其特定的格式,通过编写程序将其中所需的定位信息提取出来,并利用七参数转换方法将GPS定位系统应用的WGS-84坐标系转换成国家大地坐标系.通过车载导航试验实例分析表明,利用最短距离投影法得到的电子地图精度较高. 相似文献
8.
9.
基于"天地图·陕西"发布的电子地图服务,设计开发了适用于不同系统下的电子地图浏览系统,依托当前较为流行的移动终端,可以实现"天地图·陕西"在线矢量地图和影像地图的触控浏览、移动定位、POI搜索、周边查询、市县导航、路径导航等功能,便于用户使用"天地图·陕西"的地图服务和功能服务。 相似文献
10.
11.
12.
随着手持设备的日益普及和基于位置服务技术的逐渐成熟,移动空间信息服务成为人们关注的热点。但目前LBS系统的协议和接口都采用了自己定义的,终端的地图显示软件各有不同,地图分层不清,(意思是:国内外终端设备上的地图显示软件很多,如MapXMobile、eSupermap等,这些软件没有针对终端的特殊条件(如低内存、计算资源有限等)对地图数据进行分层组织,)针对这些问题,本文提出了在LBS中地图信息的自适应服务,基于SVG的空间数据组织模型,用细节分层显示的方法根据服务请求对地图进行分层,通过建立移动地图信息自适应服务系统,实现LBS中地图信息的自适应服务。 相似文献
13.
对黑龙江省位置服务现状进行了分析,提出了建立的黑龙江省位置服务中心的框架。位置服务中心的建立是以手机、PDA及各种移动手持终端定位服务、车辆监控等为主的服务体系,并通过WMS方式对外提供地图服务。文中对位置服务中心的设计理念、体系结构及服务模式进行了详细描述,并对其具体应用进行了探讨,最后对未来3G时代位置服务中心的应用前景进行了展望。 相似文献
14.
Location‐Based Services (LBS) are the delivery of information to mobile devices customised to location and context of the user. Some research has focused on data content, while other studies have emphasised the role of multimedia communication. However, very few objective tests have been carried out concerning usage and behaviour. In this paper, a conceptual model and a LBS test environment are presented which aim to study the behaviour and interaction between environments, individuals and mobile devices. The test environment was created, for this purpose, with three main components: urban VR models that allow individuals to ‘walk around’ at street level, a mobile device as information source which simulates LBS applications, and software for recording participant actions and reactions within the test environment. Multi‐source data were collected regarding movement tracking, information accessed through mobile device and participant observations using a combination of automated and semi‐automated methods. A case study on pedestrian wayfinding in urban settings is presented. This illustrates how the test environment can be used for LBS applications and how the data collected can be analysed. The research presented in this paper provides a novel approach in studying and understanding the interaction between environments, individuals and mobile devices. 相似文献
15.
Location-based services: technical and business issues 总被引：13，自引：0，他引：13
Geographical Information System (GIS) and Global Positioning System (GPS) technologies are expanding their traditional applications
to embrace a stream of consumer-focused, location-based applications. Through an integration with handheld devices capable
of wireless communication and mobile computing, a wide range of what may be generically referred to as 'Location-Based Services'
(LBS) may be offered to mobile users. A location-based service is able to provide targeted spatial information to mobile workers
and consumers. These include utility location information, personal or asset tracking, concierge and route-guidance information,
to name just a few of the possible LBS. The technologies and applications of LBS will play an ever increasingly important
role in the modern, mobile, always-connected society. This paper endeavours to provide some background to the technology underlying
location-based services, and to discuss some issues related to developing and launching LBS. These include whether wireless
mobile technologies are ready to support LBS, which mobile positioning technologies can be used and what are their shortcomings,
and how GIS developers manipulate spatial information to generate appropriate map images on mobile devices (such as cell phones
and PDAs). In addition, the authors discuss such issues as interoperability, privacy protection and the market demand for
LBS.
Electronic Publication 相似文献
16.
移动通信终端定位服务需要定位技术和大量相关信息作支撑。本文介绍了移动网络上使用的几种定位技术,PHS（Personal Handy—phone System）网络上主要采用Cell-ID定位技术,该定位技术的实现需要PHS基站位置信息作基础。在常州市进行PHS基站位置测量和POI（Pointof Interest,信息点）采集时,根据不同情况采用不同作业方法,其中手持GPS接收机在数据采集过程中发挥了重要作用。 相似文献
17.
18.
19.
A growing number of services are now being offered over mobile devices. They typically combine positioning technology, wireless technology and spatial analysis methods applied to detailed geographical, time based data to offer services in support of time critical, spatial, mobile decision making. A collection of research issues need to be addressed in the successful delivery of such services that extend beyond issues of sophisticated network algorithms. Specifically, careful attention needs to be given to: (1) people and user environments; (2) access to networks; (3) policy, privacy and liability; (4) standards and interoperability; and (5) data quality. Spatial Data Infrastructure (SDI) is the collective term for these interconnected issues and has been a traditional area of research associated with geographic information science. In this paper the particular SDI requirements for the successful delivery of Location Based Services (LBS) are explored through the development of a prototype LBS for journey planning. The initial implementation and testing of this prototype has revealed that the SDI context is well suited as a framework within which to examine the related LBS issues. From a more technical perspective, the testing has revealed that data structure and the means by which large data sets are mined (in order to gather information to present to users) is critical to the success of timely information delivery over limited bandwidth media. 相似文献