AJAX_SVG技术及其在WEBGIS中的应用研究

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1、西南交通大学硕士学位论文Ajax/SVG技术及其在WebGIS中的应用研究姓名：黄涛申请学位级别：硕士专业：计算机应用技术指导教师：齐华20080601西南交通大学硕士研究生学位论文第Ⅱ页AbstractInthelastfewyears，alongwithGIStechnologyandInternettechnologyunceasingdevelopment，WebGIShaswidespreadapplication．BecauseGIShascharacteristicofquantitybigdataandrapidre

2、sponseandSOon，classicWebGISalreadycouldnotwellsatisfywithbrowsingexperienceofuser,likeslowresponseofsystem，appearance”whitescreen”phenomenonandSOon．Becauseajaxengineselectsasynchronousmethodtotransmittherequestofuser,SOithassolvedstructureproblemofclassicwebapplication

3、andimproveduserexperience，itWasappliedinmanywebapplications．LightweightajaxenginetechnologybasedonWebGIShasbeenstudiedunderajaxtechnologyandtheenginehasbeenappliedinWebGISbasedonSVGvectormapinpaper．ThegoalisimproveuserexperienceandperformanceofclassicWebGIS．Mainresearc

4、hworksinthispaperareasfollows：·MethodforbasicAjaxengineunder．NET；●MethodforlightweightAjaxengine；●OrganizationandcodingschemeforgeographicspatialdatabasedonSVG；●TransformationmethodforgeographicspatialdatatoSVGdata．SystemmodelofWebGISbasedonajaxandSVGtechnologyhasbeend

5、esigned；systemclient’SfunctionshavebeenrealizedbySVGDOMtechnologyandsystemserver’sfunctionshavebeenrealizedbyOracleODENETandSpatialtechnologiesinthispaper．Itisshownthat，comparedwithclassicWebGIS，WebGISbasedonajaxandSVGtechnologieshasmanyadvantagesasfollows：●Refreshingm

6、apneednottoloadallpagesandtheoperationiscoherent．●Systemresponseispromptanduser’swaitingtimeisshort．●Somefunctionsofserveraretransferredtoclient，thusloadingbalancebetweenclientandserverisresolved．ItCanbebelievedthat，WebGISbasedonajaxandSVGtechnologyCangive西南交通大学硕士研究生学位

7、论文第Ⅲ页fulladvantagesofbothAjaxandSVGtechnologies，usingAjaxtoachieverefreshupdatemapandusingSVGtoexpressno—zoommaps．ItwillimproveuserexperienceofWebGISbaseOilSVGmapandithasthemodelsignificancetotheWebGISfurtherdevelopment．KeyWords：Ajax，SVG,WebGIS，OracleSpatial西南交通大学硕士研究生

8、学位论文第71页缩略词1．AjaX—一As)，nchronousJavaScriptAndXML，异步的JavaScfipt和XML。2．ASP-_—．ActiveServerPage，活动服务器页面3．C¨omputerAssita