简介:ThedevelopmentofInternetprovidesconvenientenvironmentforinformationsearchingandbrowsing.Italsoofferssanewplatformforgeographicinformationprocessingandanalysis.ThispaperdiscussesorganizationandprocessingapproachtoInternetgeographicinformation,andprovidesanewmethodtocross-platformanddistributedgeographicinformationanditssoftwareimplementation.Theexampieisusedtoshowthepracticalityandsuperiorityofthismethod
简介:ThispaperdiscussestheurbanlandgradingsystembasedontheselfdevelopedGISsoftware.Thesystemestablishesthesystemtemplate,therelevantdatastructureandtheempiricalformulasoftheaffectingfactorandeconomicdataoflanduse.Besides,thesystemcancalculatetheserviceradius,sumandlandgradeautomatically.Furthermore,itcandostatisticsandqueryonvariouslandinformationandshowtheresultoflandgradingwithspatialandattributedata.ThispaperillustratestheresultbygivinganexampleofthecommerciallandgradingoftheurbanareaofWuhanCitybytheurbanlandgradingsystem.
简介:ManyInternet-GIShavebeenimplementedonthewebandtheyareincreasinglybecominganimportantpartofmultimediacartographythathasmuchmoreusersascomparedtotraditionalGISproductionmedia.InternetGIStechnologyhasprovidedtheGISdynamicinformationacquisitionwithtechnicalsupport.Also,thevisualizationtechnologyofelectronicmaphasprovidedtoolsforGISsymbolswithdynamiccharacteristics.OnthebasisofGISdynamicinformationacquisition,thedesignideaandimplementationmethodsofdynamicsymbolsindynamicGISarepresentedinthisarticle.
简介:Amonitoringschememustbesodesignedthatseveralpossiblemod-elscanbeefficientlyseparatedinthestageofanalysisofdeformationmeasure-ments.BasedontheconceptofseparabilitydevelopedbyChenandChrzanowski,amethodologyforthedesignofmonitoringschemeshasbeendevelopedbytheau-thors.Inthemethodacomputersimulationtechniqueisemployed,intowhichsomeruleshavebeenelaboratedallowingminimalhumanintervention.Inthispa-perthecriterionisfirstpresentedandthedesigntechniqueusingthesteponeup-datingprocedureisdiscussed.Finally,designofasimulatedmonitoringnetworkismadeasademonstratingexample.
简介:ThispaperdevelopsaWebGIS-basedGPSvehiclemonitoringsystemwithtypicalthree-tierapplicationarchitectureofB/Spattern.Itprovidesordinaryregistereduserswithavalidandconvenientmeanstogetaccesstoreal-timeGPSlocationinformationofcertainmovingvehiclesatanyplace,andfurtheroffersapowerfultoolforsuperuserstomanageuserinformationandremotelymonitorthosevehiclesandprovidecorrespondingservicestimelyifnecessary.Thesystemarchitecture,functionmodules,keytechnologiesandapplicationinterfacesaregiven.Finally,thevalidityofoursystemisdemonstratedinpracticalcases.
简介:Weareinvolvedinanembarrassingsituationthatthelimitedcapa-bilityofautomatedfeatureextractionindigitalphotogrammetricsystemscannotsatisfytheincreasingneedsforrapidacquisitionofsemanticinformationforappli-cations.Facingthischallenge,anewtactic,Human-ComputerCollaborative(HCC)tactic,andacorrespondingnewmethod,Operator-ObjectDirected(OOD)method,areproposedforthedesignofasystemforfeatureextractionfromlargescaleaerialimages.Weholdthatinalmostalltechnicalcomplexsys-tems,fullautomationwillbeneithertechnicallyfeasiblenorsociallyacceptable.Thesystemshouldbedesignedtooptimizethroughthecooperativeoperationwithtwoagentsinthesystem:thehumanandthecomputer.
简介:ThemainpurposetodevelopaMapGraphicWorkstationonthewidelyusedmicro-computeristhatbyitthewholeprocessingofmapdatafromcapturing,managing,editing,updatingtographicoutputtingcanberealized.MapDigitizationSystem(MDS)isthesoftwaresystemtodealwiththeinitialandalsothemostimportantprocessing.Inthispaper,theauthorsintroduceaMDSonamicro-computerbasedMapGrphicWorkstationthathasbeenqualitifiedfortheproducationofdigitalmap.SincethesystemisdesignedtotallyindependentlyandinthegeneralframeoftheMapGraphicWorkstation,thecapturingandman-agingandotherprocessingsformapdataareinanintegralmanner,inwhichtheproducationofdigitalmapcanbefulfilledconveniently.Atthesametime,thesystemisflexibleforfunctionextensionandwidelyapplicabletothedatafromdif-ferentsourcesandwithdifferentinformationcharacterisitcs(e.g.,theprocessingofChinesecharactersonmap).
简介:在这份报纸,我们在身体上正在坐在不同地方的很多可得到的空间数据来源的上下文为空间数据集成(SOA-SDI)建议面向服务的体系结构,并且基于SOA-SDI开发基于万维网的GIS系统,允许顾客应用程序到达,从那些可得到的空间数据的分析和现在的空间数据采购原料。建议建筑学逻辑地包括4层或部件;他们是多重数据供应商服务,数据集成的层,后端服务的层,和前端的层为空间数据表示的图形的用户接口(图形用户界面)。根据4-layeredSOA-SDI框架,WebGIS应用程序能快速被发布,它证明SOA-SDI有潜力减少软件开发的输入并且弄短开发时期。