简介：地面模型的3D重建基于数字线图形(DLG)被讨论。一个联合汽车的三角形算法基于三角，拓扑的关系被提出，并且复杂地面的拓扑的数据模型被开发。基于这个数据模型，自动3D地面的拓扑的重建被认识到。

简介：ＳＨＥＬＬＡＤＡＰＴＩＶＥＴＲＩＡＮＧＵＬＡＴＩＯＮＯＦＴＲＩＭＭＥＤＮＵＲＢＳＳＵＲＦＡＣＥＷａｎｇＨｕｉｃｈｅｎｇＺｈａｎｇＸｉｎｆａｎｇＺｈｏｕＪｉＡｂｓｔｒａｃｔＴｈｅｐａｐｅｒｐｒｅｓｅｎｔｓａｎｅｗａｐｐｒｏａｃｈｆｏｒｔｒｉａｎｇｕｌａ...

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简介：IncrementalalgorithmisoneofthemostpopularproceduresforconstructingDelaunaytriangulations(DTs).However,thepointinsertionsequencehasagreatimpactontheamountofworkneededfortheconstructionofDTs.Itaffectsthetimeforbothpointlocationandstructureupdate,andhencetheoverallcomputationaltimeofthetriangulationalgorithm.Inthispaper,asimpledeterministicinsertionsequenceisproposedbasedonthebreadth-first-searchonaKd-treewithsomeminormodificationsforbetterper-formance.Usingparentnodesassearch-hints,theproposedinsertionsequenceprovestobefasterandmorestablethantheHilbertcurveorderandbiasedrandomizedinsertionorder(BRIO),especiallyfornon-uniformpointdistributionsoverawiderangeofbenchmarkexamples.

简介：Apreconditioningmethodforthefiniteelementstiffnessmatrixisgiveninthispaper.Thetriangulationisrefinedinasubregion;thepreconditioningprocessiscomposedofresolutionoftworegularsubproblems;theconditionnumberofthepreconditionedmatrixisO(1+logH/h),whereHandharemeshsizesoftheunrefinedandlocalrefinedtriangulationsrespectively.

简介：Inthispaper,anewdirectopticaltriangulation(DOT)formeasuringtheout-ofplanedisplacementisgiven.Inordertostateitsprinciple,DOTisusedtomea-sureamicro-displacementofarigidboty,andatthesametime,themethodofdigitalimageprocessingisalsogiven.

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简介：Areal-timetwo-dimensional(2D)triangulationrangefinderispresented,whichiscomposedoftwolinearcomplementarymetaloxidationsemiconductor(CMOS)chips,twocameralenses,andfourlightemittingdiodes(LEDs).Thehighorderdistortioninimageaberrationsisthemainfactorresponsibleforthecoarseerrors.Thetheoreticalpredictionisingoodagreementwithexperimentsandthecorrectionequationisusedtoobtainmorereliableresultswiththeuniquedistortioncoefficientinthewholeworkingregion.

简介：Thetriangulationofredspriteswasobtained,basedonconcurrentobservationsoveramesoscaleconvectivesystem(MCS)inNorthChinafromtwostationsseparatedbyabout450km.Inaddition,broadbandsfericsfromthesprite-producinglightningweremeasuredatfivegroundstations,makingitpossibletolocateandidentifytheindividualcausativelightningdischargesfordifferentelementsinthisdancingspriteevent.TheresultsofouranalysesindicatethatthespriteswereproducedabovethetrailingstratiformregionoftheMCS,andtheirparentstrokeswerelocatedmainlyintheperipheralareaofthestratiform.Thelateraloffsetbetweenspritesandcausativestrokesrangesfromafewkmtomorethan50km.Inaparticularlybrightsprite,withadistincthalofeatureandstreamersdescendingdowntoanaltitudeofapproximately48km,thespritecurrentsignalidentifiedintheelectricsferic,measuredatarangeofabout1,110km,peakedatapproximately1msafterthereturnstroke.

简介：Triangulationiswidelyusedinscientificresearch,suchasfiniteelementmeshgeneration,surfacereconstructionandthereconstructionofthedensityfielddata.Thispaperproposesanewmethodcombiningimageprocessinganddensity-controlledCentroidalVoronoitessellationstoquicklygenerateadensity-controlledconstrainedDelaunaytriangulationfor2Dseaarea.Firstly,preprocessdigitalimagesoftheseaareaandextracttheboundaryofseawaterregionbyeight-neighborsearchingalgorithm.Then,Iuse"Odd-EvenTesting"methodtocheckifonerandomvertexisinsidetheboundaryandinsertrandomverticesintotheboundary.Finally,wegettheCDTofrandomverticesbydensity-controlledCVT-Lloydmethod.Wealsogivesomecomparisonswithexistingmethods,andourmethodperformsbetterinfinalresultoftriangulation.

简介：Inthispaper,wepresenttheleast-squaresmixedfiniteelementmethodandinvestigatesuperconvergencephenomenaforthesecondorderellipticboundary-valueproblemsovertriangulations.OnthebasisoftheL2-projectionandsomemixedfiniteelementprojections,weobtainthesuperconvergenceresultofleast-squaresmixedfiniteelementsolutions.ThiserrorestimateindicatesanaccuracyofO(h3/2)ifthelowestorderRaviart-Thomaselementsareemployed.

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简介：TheaimofthispaperistogiveupperboundsofthenormoftheoperatorandassociatederrorforaLagrangeinterpolationproblembyC~1quadraticsplines.Thedomainisrectangularandthetype-2triangulationisnon--uniform.Moreoverthelocationofdatapointsallowsaverysimplecompationoftheinterpolant.