39 9 2014 9 GeomaticsandInformationScienceofWuhanUniversity Vol.39No.9 Sept.2014 DOI:10.13203/j.whugis20130034 :1671-8860(2014)09-1052-05 1 1 1 2 1 1 3 1 1 266590 2 250101 3 570203 : : ; ; ; ; :P229.2;P208 :A [1-13] 1 [2-3] ; ; [3] [4] [5] [3] [6] [7] [6] [8] :2013-04-12 : (20113718110001 ); (2012BAH27B04 2011BAC03B03); (2011418017); (2011KYTD103); ( ) (2011A04) : GIS E-mail:jamesjimin@126.com
39 9 :1053 (1) : X(t+Δt)= X(t)+Δt V(X(t)) (1) 2.2 2.2.1 [9] : 1) ; 2) ; 3) 2 : 2.1 ; μ 1 ;αij [01] 0 1 ;δ 1 6 1 [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) 2.2.2 2(b) ; 2(c)
1054 2014 9 1 Tab.1 ComparingofTwoAlgorithms CalculatingResults : /MB /s / ; ; 1 158 18.6 8 10 3336 2460 ; 2 162 18.5 9 10 3430 2481 P n ; : P 0 P n-1 3 159 18.1 8 11 3358 2489 4 159 18.0 10 10 3377 2501 5 159 17.9 10 11 3332 2442 6 157 17.8 10 12 3286 2410 7 158 17.5 10 12 3314 2384 [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 0.25 7 U V 7 [02π) 7 1 1 4 Fig.4 ComparisonofGlobeMarineFluidFlow StreamlineVisualization
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1056 2014 9 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.e-mail:jamesjimin@126.com Foundationsupport:TheResearchFundfortheDoctoralProgramofHigherEducationofChina No.20113718110001;theNational KeyTechnologyR&DProgramofChinaNos.2012BAH27B042011BAC03B03;ResearchFundofMarinePublicIndustryResearch No.2011418017;SDUST ResearchFundNo.2011KYTD103;OpenResearchFundProgramofKeyLaboratoryofSurveyingand Map- pingtechnologyonislandandreefstatebureauofsurveyingand MappingNo.2011A04.