GeomaticsandInformationScienceofWuhanUniversity Vol.39No.9 Sept.2014 DOI: /j.whugis : (2014) ,2 1 1,

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1 GeomaticsandInformationScienceofWuhanUniversity Vol.39No.9 Sept.2014 DOI: /j.whugis : (2014) : : ; ; ; ; :P229.2;P208 :A [1-13] 1 [2-3] ; ; [3] [4] [5] [3] [6] [7] [6] [8] : : ( ); (2012BAH27B BAC03B03); ( ); (2011KYTD103); ( ) (2011A04) : GIS jamesjimin@126.com

2 39 9 :1053 (1) : X(t+Δt)= X(t)+Δt V(X(t)) (1) [9] : 1) ; 2) ; 3) 2 : 2.1 ; μ 1 ;αij [01] 0 1 ;δ [1] ;θij [0π]0 π (2) αij=0d ij =0 ; θij=0 D ij =Dμαij ( σ+αi j ) δ ; θij =π D ij = ( Dμαij σ+αij )-3 δ -3 [1] 1 Fig.1 ClassificationofCriticalPoints [1] 4 (2) D ij = ( Dμαij σ+αij )-(cosθ ij -1)2 +1 (2) D ij i j ;D δ μ 2(a) (b) ; 2(c)

3 Tab.1 ComparingofTwoAlgorithms CalculatingResults : /MB /s / ; ; ; P n ; : P 0 P n [14-16] P n P n-1p 0 θ [17-18] 2.3 ( 4) 4 2 ( ) Fig.2 PlacementStrategyoftheInitialSeed Points(RedPoints) 3 A B C D 3 3 Fig.3 AdditionalSeedPoints MOM4 NetCDF 5.4GB U V 7 [02π) Fig.4 ComparisonofGlobeMarineFluidFlow StreamlineVisualization

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5 Adaptive-StepBased MarineFluidFlowStreamlineConstructingAlgorithm JI Min 1 CHEN Li 1 JIN Fengxiang 12 LI Ting 1 WANG Chunxiao 13 SUN Yong 1 1 GeomaticsColegeShandongUniversityofScienceandTechnologyQingdao266590China 2 ShandongJianzhuUniversityJinan250101China 3 HainanAdministrationofSurveyingMappingandGeoinformationHainkou570203China Abstract:Thevisualizationofvectorfieldshasbecomeanimportantmeansfortheexpressionofflows inmanydiferentdisciplines.inordertoexpressamarinefluidflow'sstructuremoreclearlybasedon criticalpointtheorywepresentanewseedingpointplacementstrategyandanewadaptive-stepcom- putationmodel.consideringalocalcel'svelocityandflowdirectionjointlywithtwodegreesoffree- domitadjuststhestepsbyusingtwoparametersandrealizesthestepaccelerationanddeceleration accordingtotheflowdirection.fortheplacementoftheglobalflowfieldstreamlineswealsogivea newstreamlinedensityadjustmentstrategybasedonasmoothingwindow.experimentalanalysisofa globaloceanflowvisualizationshowsthatthisalgorithmbeterexpressesthemarinefluidflowstruc- tureandsuggestsareasonableplacementofstreamlines. Keywords:flowfieldvisualization;streamlinetracking;criticalpointtheory;marinefluidflow;a- daptive-stepalgorithm Firstauthor:JIMinPhDassociateprofessorspecializesintheoriesandmethodsofspatialdataorganizationandGISapplicationdevel- opment. jamesjimin@126.com Foundationsupport:TheResearchFundfortheDoctoralProgramofHigherEducationofChina No ;theNational KeyTechnologyR&DProgramofChinaNos.2012BAH27B042011BAC03B03;ResearchFundofMarinePublicIndustryResearch No ;SDUST ResearchFundNo.2011KYTD103;OpenResearchFundProgramofKeyLaboratoryofSurveyingand Map- pingtechnologyonislandandreefstatebureauofsurveyingand MappingNo.2011A04.