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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.

    標(biāo)簽: manipulating displaying geoGraphic geotools

    上傳時(shí)間: 2015-02-28

    上傳用戶: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.

    標(biāo)簽: representations geoGraphic transport grammar

    上傳時(shí)間: 2014-01-12

    上傳用戶:thesk123

  • 基于ARM的GPS定位系統(tǒng)設(shè)計(jì)

    當(dāng)前全球定位系統(tǒng)(Navigation Satellite Timing And Ranging Global Position System,簡稱GPS)廣泛應(yīng)用于艦船導(dǎo)航,航空航天,地理測繪等領(lǐng)域,特別是移動(dòng)式定位系統(tǒng)對于目前的城市交通管理有著非常重要的意義。本文分析了當(dāng)前交通管理中的實(shí)際問題,介紹了一種車載終端的設(shè)計(jì)方法。設(shè)計(jì)采用ARM9內(nèi)核的S3C2410微處理器構(gòu)造的嵌入式系統(tǒng),可以實(shí)現(xiàn)對GPS定位信息的接受和處理,并采用嵌入式Linux操作系統(tǒng),結(jié)合開放式Linux圖形軟件Qt,可以為后續(xù)的建立地理信息系統(tǒng)(geoGraphic information system,簡稱GIS)提供數(shù)據(jù)支持,是集GPS全球衛(wèi)星定位系統(tǒng)和通用分組無線業(yè)務(wù)(General Packet Radio Service,簡稱GPRS)無線通信技術(shù)于一體的新型電子產(chǎn)品。它為現(xiàn)代交通運(yùn)輸提供了新穎,可靠,有效的控制和管理途徑。 車載終端通過將GPS模塊的定位信息提取出來,一方面將定位信息在車載終端上顯示,一方面又結(jié)合車輛的狀態(tài)信息通過GPRS模塊發(fā)送出去,該信息通過無線公共網(wǎng)絡(luò)傳輸給車輛管理部門。車輛管理部門根據(jù)車輛的位置和狀態(tài)等,結(jié)合GIS系統(tǒng)中的地圖信息提供GPS數(shù)據(jù)的差分修正,并采取一定的措施,從而實(shí)現(xiàn)車輛的有效管理。 本設(shè)計(jì)從硬件和軟件兩大部分出發(fā),硬件上設(shè)計(jì)了ARM處理器、存儲器、內(nèi)存及其外圍電路,另外還有GPS模塊電路和GPRS模塊電路;軟件上采用Qt的人機(jī)界面完成數(shù)據(jù)顯示與更新,采用PPP撥號腳本完成GPRS模塊的撥號,通過Qt多線程編程的方法完成GPS數(shù)據(jù)的提取和GPRS的信息發(fā)送。在硬件和軟件之間采用了嵌入式Linux系統(tǒng),包括啟動(dòng)代碼、內(nèi)核和文件系統(tǒng)等。

    標(biāo)簽: ARM GPS 定位 系統(tǒng)設(shè)計(jì)

    上傳時(shí)間: 2013-04-24

    上傳用戶:夜月十二橋

  • 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.

    標(biāo)簽: Microwave Line

    上傳時(shí)間: 2020-05-28

    上傳用戶: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.

    標(biāo)簽: Management Spectrum Access and

    上傳時(shí)間: 2020-06-01

    上傳用戶:shancjb

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