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geoGraphic

  • 基于geotools的demo GeoTools is a Java library for manipulating and displaying geoGraphic maps.

    基于geotools的demo GeoTools is a Java library for manipulating and displaying geoGraphic maps.

    标签: manipulating displaying geoGraphic geotools

    上传时间: 2015-02-27

    上传用户:zhangyi99104144

  • KML is an XML grammar used to encode and transport representations of geoGraphic data for display in

    KML is an XML grammar used to encode and transport representations of geoGraphic data for display in an earth browser. Put simply: KML encodes what to show in an earth browser, and how to show it. KML uses a tag-based structure with nested elements and attributes and is based on the XML standard.

    标签: representations geoGraphic transport grammar

    上传时间: 2014-01-11

    上传用户:thesk123

  • 基于ARM的GPS定位系统设计

    当前全球定位系统(Navigation Satellite Timing And Ranging Global Position System,简称GPS)广泛应用于舰船导航,航空航天,地理测绘等领域,特别是移动式定位系统对于目前的城市交通管理有着非常重要的意义。本文分析了当前交通管理中的实际问题,介绍了一种车载终端的设计方法。设计采用ARM9内核的S3C2410微处理器构造的嵌入式系统,可以实现对GPS定位信息的接受和处理,并采用嵌入式Linux操作系统,结合开放式Linux图形软件Qt,可以为后续的建立地理信息系统(geoGraphic information system,简称GIS)提供数据支持,是集GPS全球卫星定位系统和通用分组无线业务(General Packet Radio Service,简称GPRS)无线通信技术于一体的新型电子产品。它为现代交通运输提供了新颖,可靠,有效的控制和管理途径。 车载终端通过将GPS模块的定位信息提取出来,一方面将定位信息在车载终端上显示,一方面又结合车辆的状态信息通过GPRS模块发送出去,该信息通过无线公共网络传输给车辆管理部门。车辆管理部门根据车辆的位置和状态等,结合GIS系统中的地图信息提供GPS数据的差分修正,并采取一定的措施,从而实现车辆的有效管理。 本设计从硬件和软件两大部分出发,硬件上设计了ARM处理器、存储器、内存及其外围电路,另外还有GPS模块电路和GPRS模块电路;软件上采用Qt的人机界面完成数据显示与更新,采用PPP拨号脚本完成GPRS模块的拨号,通过Qt多线程编程的方法完成GPS数据的提取和GPRS的信息发送。在硬件和软件之间采用了嵌入式Linux系统,包括启动代码、内核和文件系统等。

    标签: ARM GPS 定位 系统设计

    上传时间: 2013-04-24

    上传用户:夜月十二桥

  • Microwave+Line

    Fordecades,microwavelineofsight(LOS)linkshavebeenoneofthebasictechnolo- gies used to build telephone networks. Until 1980, the fast rollout of high capacity transport networks and deployment of links in areas with challenging geoGraphic characteristics could not be understood without this technology.

    标签: Microwave Line

    上传时间: 2020-05-27

    上传用户:shancjb

  • Spectrum+Access+and+Management

    The radio spectrum is one of the most precious resources which must be managed to ensure efficient access for the wireless communication services which use it. The allocation and management of spectrum are administered by the regulatory authorities. Traditionally, spectrum allocation is carried out exclusively of its use in large geoGraphic areas and assigning frequency bands to specific users or service providers is proved to be inefficient. Recently, substantial knowledge about dynamic spectrum access scheme has been accumulated to enable efficient spectrum sharing.

    标签: Management Spectrum Access and

    上传时间: 2020-05-31

    上传用户:shancjb