简介：ManyInternet-GIShavebeenimplementedonthewebandtheyareincreasinglybecominganimportantpartofmultimediacartographythathasmuchmoreusersascomparedtotraditionalGISproductionmedia.InternetGIStechnologyhasprovidedtheGISdynamicinformationacquisitionwithtechnicalsupport.Also,thevisualizationtechnologyofelectronicmaphasprovidedtoolsforGISsymbolswithdynamiccharacteristics.OnthebasisofGISdynamicinformationacquisition,thedesignideaandimplementationmethodsofdynamicsymbolsindynamicGISarepresentedinthisarticle.

简介：Adoptingaprincipleof“check-acceptforthefirstrank,inspectionforthesecondrank”,thispaperbrieflydiscussestherationaleofthesamplinginspectionandthesamplinginspectionschemestodigitalproductsinGIS.TheOCcurveisdrawntoexplainthedeficiencyofthepercentsamplinginspection.Meanwhile,themethodofOneTimeLimitingQualityofcountselectionispresentedastheinspectionschemeforproductiondepartmentswhilethemethodofOneTimeAfter-inspectionMeanPercentDefectiveUpperLimitofcountselectionisforacceptancedepartments.

简介：本文提出ＧＩＳ中有关自动综合取舍问题的系统的研究。通过讨论地理基础数据库和其图形的概念以及与地图的区别，首先解释问题的目的和范围。在分析了复杂的地图综合取舍之后，介绍了较简单和更明白的综合取舍概念。根据这个概念，辩别和分类数据库处理和图形生成相关的综合取舍问题。由命题的方式提出关于数据库中综合取舍问题的分析，对于复杂问题介绍处理矩阵和处理网络来模拟基本处理。最后，本文阐述图形相关的综合取舍的一般原则

简介：Ithasbeendebatedthatwhichofrasterandvectoristhemosteffective,fromtheviewpointsofstorageefficiency,processingefficiency,andabilitytocapturetheessenceofgeographicspaceforanapplication.Theremaybenoclearanswertothisdebate.Itseemsappropriatetonotethatthemaindifferencebetweenthemrelatestothedegreetowhichthespatialentitiesofinterestareexplicitinthedata.　Ingeneral,rasterremotesensingimageallowstheinvestigatortomeasureandmonitorsurfaceelectromagneticwavevariationinwhichmostobjectsandthespatialinterrelationshipsbetweenthemareimplicit.Inpractice,therearemanypoorlyunderstoodtradeoffsincouplingremotesensingdatatoexistingthematicmaps.Mapsusepointsandlinestorepresentselectedfeaturesoftheenvironmentinageneralizedfashion,buttheobjectssuchasindividualpolygons,linesandpointswithinanimagearetypicallyunknown.　　TheintegrationofremotesensinginformationintoaGISoccursnaturallyinarasterGISbecausebothdatastructuresareapproximatelythesame.Integrationintoavectorsystemrequiressomewhatmoreeffort,butithasbeenrecentlyachievedbyseveralGISandremotesensingvendors.Whenoneisstoringalargeamountofimagedatarelatedtosomeapplicationsintoaspatialdatabasesystem,itisnotpossibletoprocessthedataandtoobtainpolygonalrepresentationsofallobjectsthatwillbeofinteresttousersinadvance.Ontheotherhand,itmightbeofgreatvalueinsuchasystemtohaveavectorrepresentationofcertainimportantobjects.Forthisapplication,oneneedstodesignasystemwithbothrasterandvectorcapabilities,aswellastoolstointerrelatethem.Especially,asinFig.1,weneedtoprocessbothrasterandvectorsimultaneously.　　Asdescribedabove,whileaspatialinformationsystemmayhaveseveraldatastructures,thesystemcouldbeextendedinseveralwayswhichcorrespondtothefollowingdifferentproperties(seeFig.2):　1)Thestuructureinforma

简介：网络分析作为GIS的重要功能，在电子导航、交通旅游、城市规划以及电力、通讯等各种管网、管线的布局设计中发挥了重要的作用。随着GIS系统集成应用的不断深入，为了满足用户的应用需求，我们通过二次开发的手段，为一些GIS平台定制了网络分析功能。利用经典的Dijkstra算法，结合GIS数据和平台特点，通过简单的程序设计可以实现复杂的网络分析功能。

简介：［1］NyergesTL.Cognitiveaspectsofhuman-computerinteractionforgeographicinformationsystems.KluwerAcademicPublishers,1995.287～310［2］ChurcherN,ChurcherC.GroupARC——acollaborativeapproachtoGIS.In:Proceedingsofthe8thColloquiumoftheSpatialInformationResearchCentre.UniversityofOtago,1996.156～163［3］ObermeyerNJ,PintoJK.Theroleofgeographicinformationwithinanorganization'sMIS.In:ManagingGISs.TheGuilfordPress,1994.35～51［4］SpencerB.Spatialdatawarehousing.In:ProceedingsofGISAM/FMASLA'97&Geoinformatics'97onMappingtheFutureofAsia-Pacific.China:Taipei.1997.545～553［5］ChenJ,JiangJ,YanR,etal.Integratingandmanagingheterogeneousgeographicinformationforurbanplanning&landadministration.ActaGeodaeticaetCartographicaSinica,1998,27(2):153～160［6］WuR.Towardsanenterprise-wideGISsystem:acasestudy.In:ProceedingsofGISAM/FMASIA'97&Geoinformatics'97onMappingtheFutureofAsia-Pa-cific.China:Taipei,1997.657～671［7］ChenJ,JiangJ,JinS,etal.designingacollaborativeworksystembyintegratingGISwithOA.JournalofRemoteSensing,1998,2(3):59～64［8］GoodmanJN.Albertalandrelatedinformationsystem-afederateddatabasecasestudy.In:ProceedingsofURISA,1994［9］IgrasE.Aframeworkforqueryprocessinginafederateddatabasesystem:acasestudy.In:ProceedingsofURISA,1994［10］ShethAP.Federateddatabasesystemsformappingdistributed,heterogeneous,andautonomousdatabases.ACMComputingSurveys,1990,22(3):183～235［11］NewtonPW,GippsPG,CrawfordJR.Virtualplanninganddesign:anemegingparadigm.In:Proceedingsof4thinternationalconferenceoncomputersinurbanplanningandurbanmanagement.Australia:Melbourne,1995.27～38［12］BennettWS.Visualizingsoftware—agraphicalnotationforanalysis,design,anddiscussion.NewYork:MarcelDekker,Inc.,1992［13］TeisseireM,PonceletP,Cicchetti

简介：演讲为从在WGGGI的成员之中散布的问询表获得的乔治国王岛在存在测地学的数据上包含信息。

简介：ThispaperdescribestheuseoftheArc/InfoandArcViewGIStoolstoestimatesoilerosionwithUniversalSoilLossEquation(USLE).Calculationsarebedonebyusingcapabilitiesavailable.Thisstudystartwithadigitalelevationmodel(DEM)ofShaanxi,whichwascreatedbydigitizingcontourandspotheightsfromthetopographicmapon1∶250000scaleandgridthemesfortheUSLEKandCfactors.ItisnoteworthythatUSLEKcanbeobtainedbyaddingtheKfactorasanattributetoasoiltheme'stable.TheCcanbeobtainedfromtablesorusingtheinformationaboutlanduseandmanagementgivenbyUSLEprogram.AlandusethemecanbeusedtoaddtheCfactorsasanattributefield.ThepurposeofthisstudyistoestablishspatialinformationofsoilerosionusingUSLEandGISanddiscusstheanalysisofthesoilerosionandslopefailuresinGISandformulatethepossibleframework.

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简介：专业地理信息系统中,不同用户角色拥有不同用户权限区,这种角色控制方式是适合现行的管理机制的,但该种方式以区域来确定用户权限区的固定角色控制在解决跨区域协作问题存在困难,当事务发展涉及到多个区域时,不能合理有效的信息共享,造成信息系统失效.针对该问题在基于角色的访问控制基础上,提出空间相关的动态角色控制,分析其需要考虑的各个方面,做了详细的设计,探讨了总体结构和核心设计.最后通过一个森林防火地理信息系统中火灾跨区域扑救协作典型实验,来验证空间相关的动态角色控制对解决跨区域协作是可行的.

简介：　　目前使用直接数据访问模式实现多源数据集成的GIS软件主要有两个,而且在一个GIS软件中访问某种软件的数据格式不要求用户拥有该数据格式的宿主软件,　　多源空间数据据格式集成还有一个很重要的方面就是如何处理不同数据库对空间实体采用的编码方式不同的问题

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简介：Positionalerroroflinesegmentsisusuallydescribedbyusing'g-band',however,itsbandwidthisinrelationtotheconfidencelevelchoice.Infact,givendifferentconfidencelevels,aseriesofconcentricbandscanbeobtained.Toovercometheeffectofconfidencelevelontheerrorindicator,byintroducingtheunionentropytheory,weproposeanentropyerrorellipseindexofpoint,thenextendittolinesegmentandpolygon,andestablishanentropyerrorbandoflinesegmentandanentropyerrordonutofpolygon.Theresearchshowsthattheentropyerrorindexcanbedetermineduniquelyandisnotinfluencedbyconfidencelevel,andthattheyaresuitableforpositionaluncertaintyofplanargeometryfeatures.

简介：BasedonthebiologicalresourcessurveysinChina'sexclusiveeconomiczone,thepaperdiscussestheapplicationoftheGIStechnologyinevaluatingthemarineenvironmentalquality,establishesthebasicconceptandtechnologicalprocessforevaluatingtheenvironmentalqualityofthehabitatsofmarinelivingresources,proposesthekeypointsfortheestablishmentoftherelevantevaluationattributesdatabasebyapplyingtheGIStechnologyandanalysesseveraltypicalevaluationmodelsandthedatainterpolationmethodforthemodelinGIS.ResultsshowthatthecombinationoftheGIStechnologywiththequantitativeevaluationmodelcanbeappliedtothefastandaccurateevaluationofthemarineenvironmentalquality.

简介：阐述了将地理信息系统(GIS)引入矿山开采沉陷的重要性。提出了GIS在矿山开采沉陷中应用的总体思路；对基于GIS的“三下”采煤方案设计、开采沉陷的环境影响评价以及矿山开采沉陷的预测预报的基本思路和数据结构的组织方式进行了分析；分析了GIs在开采沉陷领域应用的关键技术问题。

简介：利用模糊变权评价、灰关联综合评价和遗传BP网络评价等多种定量评价模型,分别对广东省土壤资源进行质量评价,并对各种评价模型的特点进行了比较与分析。

简介：地理信息系统（GIS）将使移动空间服务进入一个全新的时代。本文介绍了第三代移动通信网络和地理信息系统的相关特性，就地理信息系统目前在移动网络中应用的市场现状和相关技术做了分析．列举了国内外较有影响的移动服务，尝试就地理信息系统在我国第三代移动网络中的应用做出大胆预测并予以举例说明。

简介：GIS（GeographicInformationSystem地理信息系统）是空间数据与属性数据相结合并为人们提供存储、管理、分析等功能的可视化计算机信息系统，它是计算机科学、地理学、测量学、地图学和空间技术等多门学科的交叉和综合应用.

简介：以中文Ｗｉｎｄｏｗｓ３．１为系统运行环境，以ＷＩＮＧＩＳ为基础，用ＭｉｃｒｏｓｏｆｔＶｉｓｕａｌＢａｓｉｃ４０作为开发工具，建立了荒溪分类和危险区制图模型及其信息系统．该系统由文件管理子系统、属性数据管理子系统、图形数据管理子系统、应用模型子系统等构成．应用结果验证了系统模型的各项功能，表明系统设计合理，运行稳定、安全．

简介：社区是现代社会的一个重要组成部分，社区的功能越来越完善，同时对社区管理的要求也越来越高。传统的社区管理软件存在着不足，现在把组件式地理信息系统应用于社区管理，可以极大的提高社区管理的效率和质量。本文阐述了组件式地理信息系统的基本概念和技术基础，另外论述了利用VB6．0和MAPINFO公司的MAPX4．0组件实现一个社区管理信息系统的过程。