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1、ThemeRiver:VisualizingThemeChangesoverTimeSusanHavre,BethHetzler,andLucyNowellBattellePacificNorthwestDivisionRichland,Washington99352USA1+509+375-6948{susan.havre
2、beth.hetzler
3、lucy.nowell}@pnl.govAbstractKeywords:visualizationmetaphors,trendanalysis,ThemeR
4、iver™isaprototypesystemthatvisualizestimelinethematicvariationsovertimewithinalargecollectionofdocuments.The“river”flowsfromlefttorightthroughtime,changingwidthtodepictchangesin1.Introductionthematicstrengthoftemporallyassociateddocuments.Colored“currents”f
5、lowingwithintherivernarroworInexploratoryinformationvisualization,onegoaliswidentoindicatedecreasesorincreasesinthestrengthtopresentinformationsothatuserscaneasilydiscernofanindividualtopicoragroupoftopicsinthepatterns.Patternsrevealtrends,relationships,ano
6、ma-associateddocuments.Theriverisshownwithinthelies,andstructureinthedata,andmayhelpuserscontextofatimelineandacorrespondingtextualpresentationofexternalevents.Figure1:ThemeRiver™usesarivermetaphortorepresentthemechangesovertime.ProceedingsoftheIEEESymposiu
7、monInformationVisualization2000(InfoVis'00)0-7695-0804-9/00$10.00@2000IEEEconfirmknowledgeorhypotheses.Perhapsmoreimpor-representation.However,itconnectsthestrengthvaluestantly,theyalsoraiseunexpectedquestionsleadinginadjacenttimesliceswithsmoothandcontinuo
8、ususerstonewinsights.Thechallengeistocreatevisuali-curves.Thehorizontalflowoftheriverrepresentsthezationsthatenableuserstofindpatternsquicklyandflowoftime.Coloredcurrentsthatrunhorizontallyeasily.ThemeRiver,showninFigure1,isaprototypewithintheriverrepresent
9、themes.Eachverticalsectionsystemdesignedtorevealtemporalpatternsintextoftherivercorrespondstoanorderedtimeslice.collections.ThewidthofeachcurrentchangestoreflecttheInformationvisualizationsystemssuchasEnvisionthematicstrengthforeachtimeslice.Forexample,in[1
10、3],BEAD[1],LyberWorld[3,4]andSPIRE[18]Figure1thetheme“soviet”increasesinrelativerepresenteachdocumentorgroupofdocumentswithastrengthinJune1960asindicatedbythewideningofglyphoricon,portrayingvariousdocu
