简介:Thispaperpresentsamethodologytodeterminethreedataquality(DQ)riskcharacteristics:accuracy,comprehensivenessandnonmembership.Themethodologyprovidesasetofquantitativemodelstoconfirmtheinformationqualityrisksforthedatabaseofthegeographicalinformationsystem(GIS).FourquantitativemeasuresareintroducedtoexaminehowthequalityrisksofsourceinformationaffectthequalityofinformationoutputsproducedusingtherelationalalgebraoperationsSelection,Projection,and...
简介:ThecurrentGIScanonlydealwith2-Dor2.5-Dinformationontheearthsurface.Anew3-Ddatastructureanddatamodelneedtobedesignedforthe3-DGIS.Thispaperanalyzesdiverse3-Dspatialphenomenafromminetogeologyandtheircomplicatedrelations,andproposesseveralnewkindsofspatialobjectsincludingcross-section,columnbodyanddigitalsurfacemodeltorepresentsomespecialspatialphenomenaliketunnelsandirregularsurfacesofanorebody.Anintegrateddatastructureincludingvector,rasterandobject-orienteddatamodelsisusedtorepresentvarious3-Dspatialobjectsandtheirrelations.Theintegrateddatastructureandobject-orienteddatamodelcanbeusedasbasestodesignandrealizea3-Dgeographicinformationsystem.
简介:I.IntroductionChangesinwetlandsplayanimportantroleinglobalchange.Moreandmoreatentionisbeingpaidtochangesinwetlandsandtheirimp...
简介:摘要: 配电 GIS是一个基于地理信息系统( GIS)、关系型数据库和计算机网络的电力设备管理、检修和运行的高级信息管理系统,它主要针对 10KV及以下的电力配网系统,一般包括自动绘图( Automatic Mapping, AM)、设备管理( Facility Management, FM)和地理信息系统,因此,也称为 AM/FM/GIS。本文基于以上内容对配电 GIS 进行了介绍。
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简介:ManyInternet-GIShavebeenimplementedonthewebandtheyareincreasinglybecominganimportantpartofmultimediacartographythathasmuchmoreusersascomparedtotraditionalGISproductionmedia.InternetGIStechnologyhasprovidedtheGISdynamicinformationacquisitionwithtechnicalsupport.Also,thevisualizationtechnologyofelectronicmaphasprovidedtoolsforGISsymbolswithdynamiccharacteristics.OnthebasisofGISdynamicinformationacquisition,thedesignideaandimplementationmethodsofdynamicsymbolsindynamicGISarepresentedinthisarticle.
简介:摘要:近几年,由于国内高新科技的迅速发展,地理信息系统也得到很大发展空间。为此为基本,本文专业针对地理信息系统在工程测绘中应用优势和具体应用开展分析,便于提高我国工程测绘工作中水准。