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1、TheDesignandImplementationof3DElectronicMapofCampusBasedonWEBGISI.INTRODUCTIONNowadays,digitalizationandinformatizationarethethemeofourtimes.Withthedevelopmentofinformationrevolutionandcomputerscience,computertechnologyhaspenetratedintoallfieldsofscienceandcausedman
2、yrevolutionarychangesinthesesubjects,theancientcartographyalsocan'tescape.Withthetechnicalandculturalconstantlyprogress,theformandthecontentofthemapchangeandupdateaswell.Asthecomputergraphics,geographicinformationsystems(GIS)constantlyappliedtotheWeb,theconventional
3、wayoffabricationanddemonstrationhassufferedgreatchange,andtheapplicationoftheMaphasextendeddramaticallyowingtothedevelopmentofadvancedinformationtechnology.Underthesecircumstances,cartographywillbefacedwithpromisingprospect.Ithasbranchedoutintomanynewproducts.Oneoft
4、heproductscomeintobeingisthee-map[1].Withtherapiddevelopmentofthecomputertechnology,computergraphicstheory,remotesensingtechnology,photogrammetrictechnologyandotherrelatedtechnology.Usersrequirehandlingandanalysisofthree-dimensionvisualization,dynamicinteractivityan
5、dshowtheirvariousgeo-relateddata,somuchattentionshouldbepaidtotheresearchofthreedimensionalmaps.ThisarticlebasedontheNortheastPetroleumUniversityanditssurroundingsdesignsandcreatesthethree-dimensionalelectronicmap.II.FUNCTIONDESIGNThree-dimensionalelectronicmapsyste
6、mofcampusbasedonWEBGIShasgeneralcharacteristicsofthecommonmaps.Throughpressingthearrowkeys(Up,Down,Left,AndRight)onthekeyboard,onecanmakethemapmovetowardsthecorrespondingdirectionoftranslation.Throughdraggingmouse,onecanseewhereverhelikes.Usingthemousewheel,youcanco
7、ntrolamap'smagnitude,accordingtotheuser'sneedstoviewdifferentlevelsofmap.Thelowerleftofthemapwherewilldisplaythecurrentcoordinateofthemouseonthemap.Inadivlayer,wedepictahotspotofnewbuildings,thislayer17canbedisplayedaccordingtothedifferentmaplayers,italsocanautomati
8、callyscale.Byclickingonhotspots,itcanshowthehotspot'sspecificinformation.Onecanalsotypeintothequeryinformationbasedonhisneed,andgetsomerel
