简介:Inthispaperthedevelopmentofthetechnologyofthelaserscanningissummarized.Theprinciplesoflaserrangescanningareintroduced.Basedonthelaserscanningtechnologyandmethods,whichareinvestigatedbytheauthorstosurveydepositvolume,asurveyingsystemisdevelopedandapracticalapplicationisperformed.Itisshownthatthelaser-scanningtechnologyhasobviousadvantagessuchasmeasurementprecision,automationandvisualizationofobserveddataincomparisonwiththetraditionalmethods.Asaresult,laborintensityisrelievedobviouslyandworkefficiencyispromoted.
简介:WiththehelpofCCDimages,therealizationofhighprecisionpo-sitioningandmeasurementhasbecomethebasicstandardformachinevisionandrealtimephotogrammetrysystems.However,deformationandothersortsofdegradationoccurringduringtransmissionaremajorlimitingfactorsofthepreci-sionattainablewithmostcurrentCCDcamerasandframegrabbers.SoapreciseradiometricandgeometrictransmissionofimagesfromCCDsensortomemoryisafundamentalaspectofCCDcameracalibration.Thegeometriccalibrationsystem,whichusessomeimageprocessingalgorithmsoftheCCDcamerabasedonthere-searchedanddevelopedsystemisdiscussed.Thereliabilityandvalidityarealsodiscussed.TheexperimentalresultsforthecalibrationoftheCCDarraywillbetakenasanimportantqualityindexforCCDevaluation.
简介:Afewresearchesadoptvirtualrealityinlandslide.Soitissignificanttocombinethephysics-baseddeformablemethodwiththeprocesssimulationofaslidinglandslide,thiswaythedynamicprocessofagoinglandslidecanbesimulated.Theanalysisofthedynamiclawoflandslideprovidesafoundationtoforecastandmakeitrealiabletoforetelldisasters.AfterrecountingtheconditionofVRandlandslidingbodysimulation,thispaperputsforwardsimulatinglandslidebythephysics-baseddeformablemethod.Themethoddivideslandslidingintodeformablebodyandrigidone.ThedeformationofdeformablebodycanbecomputebyDDAandFEM,andDDAfitsthegreatdeformationandFEMisgoodforthetinydeformation.Thispapershowsitisfeasibletosimulatethelandslideanimationbythismethod.
简介:基于在二个邻近的地面单位之间的正常向量角度的估计的规则,我们使用地面复杂性因素的概念确定DEM的地面复杂性,然后在光栅DEM和听DEM的地面复杂性因素的公式理论上被推出。以便弄明白地面复杂性因素ECF和平均举起h怎么影响DEM地面表示RMSEet的精确性,高斯的公式摹拟的表面被使用模仿几真实地面表面,其各个有不同地面复杂性。通过在模拟数据,在DEM地面表示RMSEet的精确性之间的线性方程,地面复杂性因素ECF和一般水准的线性回归的统计分析,举起h被完成。一个新方法被提供与某个地面复杂性估计DEM地面表示RMSEet的精确性,它以后为DEM生产和相应错误研究给有说服力的理论证据。
简介:DetectionofaperiodicsignalhiddeninnoiseisthegoalofSuperconductingGravimeter(SG)dataanalysis.Duetospikes,gaps,datumshrifts(offsets)andotherdisturbances,thetraditionalFFTmethodshowsinherentlimitations.Instead,theleastsquaresspectralanalysis(LSSA)hasshoweditselfmoresuitablethanFourieranalysisofgappy,unequallyspacedandunequallyweighteddataseriesinavarietyofapplicationsingeodesyandgeophysics.ThispaperreviewstheprincipleofLSSAandgivesapossiblestrategyfortheanalysisoftimeseriesobtainedfromtheCanadianSuperconductingGravimeterInstallation(CGSI),withgaps,offsets,unequalsamplingdecimationofthedataandunequallyweighteddatapoints.
简介:WehaveintegratedinformationfromseismicmomenttensorsandGPSvelocitiesinQinghai_Tibetanditsmargins.Belowwesummarizesomepointsfromthisstudy. 1)ThedeformationratesfromseismicmomenttensorsandfromGPSvelocitiesarebasicallyagreedwitheachother. 2)Thetendenciesofdirectionsofseismicandgeodeticprincipalstrainrateareresembleexceptforoneortwoblocks,however,themagnitudesofaveragestrainratefromseismicmomenttensorsaremuchlargerthanthatfromGPSvelocitiesexceptformiddleTibetblock. 3)Accordingtotheopinionthatstrainenergywillbereleasedthroughearthquake,itisviableforanalyzingearthquakepotentialbycomparinggeodeticstrainratewithseismicstrainrate.Thereisearthquakepotential(>M5)inmiddleTibetinafewyears.Acknowledgment WethankDr.WangQiprovidingGPSvelocitiesinTibetanditsmargins.
简介:Anewsimilarsingle-differencemathematicalmodel(SS-DM)anditscorrespondingalgorithmareadvancedtosolvethedeformationofmonitoringpointdirectlyinsingleepoch.ThemethodforbuildingtheSSDMisintroducedindetail,andthemainerrorsourcesaffectingtheaccu-racyofdeformationmeasurementareanalyzedbriefly,andthebasicalgo-rithmandstepsofsolvingthedeform-ationarediscussed.Inordertovalidatethecorrectnessandtheaccuracyofthesimilarsingle-differencemodel,thetestwithfivedualfrequencyreceiversiscarriedoutonaslidewaywhichmovedinplaneinFeb.2001.Inthetest,fivesessionsareobserved.Thenumericalresultsoftestdatashowthattheadvancedmod-eliscorrect.
简介:在这份报纸,我们在身体上正在坐在不同地方的很多可得到的空间数据来源的上下文为空间数据集成(SOA-SDI)建议面向服务的体系结构,并且基于SOA-SDI开发基于万维网的GIS系统,允许顾客应用程序到达,从那些可得到的空间数据的分析和现在的空间数据采购原料。建议建筑学逻辑地包括4层或部件;他们是多重数据供应商服务,数据集成的层,后端服务的层,和前端的层为空间数据表示的图形的用户接口(图形用户界面)。根据4-layeredSOA-SDI框架,WebGIS应用程序能快速被发布,它证明SOA-SDI有潜力减少软件开发的输入并且弄短开发时期。