现有测绘成果转换到中国2000大地坐标系毕业论文外文文献翻译及原文

毕业设计（论文）外文文献翻译文献、资料中文题目：现有测绘成果转换到中国2000大地坐标系文献、资料英文题目：文献、资料来源：文献、资料发表（出版）日期：院（部）：专业：班级：姓名：学号：指导教师：翻译日期：2017.02.14附录1英文原文ConversionofexistingmappingresultstotheChinaGeodeticCoordinateSystem2000Chinaisavastareaofthecountry,duetohistoricalreasons,China'sadoptionoftheBeijing54coordinatesystem,suchasXi'an80coordinatesystemcoordinates.Withthemappingtechnologyknownas2000,Chinaestablishedanationalgeodeticcoordinatesystemoftheearthcoordinatesystem.Thiswillbetheextentpossible,onChina'sachievementshavebeenconvertedtothenewmappingcoordinatesavarietyoftheoreticalmethodstobelearningfromindustrypeers.1.DefinitionoftheChinaGeodeticCoordinateSystem20001.NationalGeodeticcoordinatesystemisdefinedtoincludetheoriginofcoordinates,threeaxesofdirection,scale,andtheearthellipsoidfourbasicparametersofthedefinition.ChinaGeodeticCoordinateSystemorigintoincludetheoceansandatmospherewholeEarth'scenterofmass;ChinaGeodeticCoordinateSystemZaxispointingtotheoriginalEpoch2000.0oftheEarth'sdirection,theepochofthepointbytheInternationalBureauoftimeepoch1984.0settheinitialpointfortheprojections,thetimeevolutionoforientationrelativetothecrustdoesnotguaranteetheglobalresidualrotation,X-axispointingtotheoriginalpointofreferenceGreenwichmeridianandtheEarthequatorialplane(epoch2000.0)oftheintersection,Y-axisandZaxis,Xaxistotherighthandorthogonalcoordinatesystem.Withgeneralrelativityinthesenseofscale.ChinaGeodeticCoordinateSystemusedintheearthellipsoidparametersvaluesare:Longaxlea＝6378137mFlatratef=1/298.257222101GravitationalconstantGM＝3.986004418×1014m3s-2Angularvelocityω＝7.292l15×10-5rads-1Otherparametersasfollows:Shortradiusb(m)6356752.31414Polarradiusofcurvaturec(m)6399593.62586Thefirsteccentricitye0.0818191910428Squaredoffirsteccentricitye20.00669438002290SecondEccentricitye0.0820944381519SquaredofSecondEccentricitye20.006739496775481/4ThelengthofthemeridiancircleQ(m)10001965.7293TheaverageradiusofellipsoidR1(m)6371008.77138ThesamesurfaceareaofthesphereradiusR2(m)6371007.18092ThesamevolumeofradiusR3(m)6371000.78997EllipsoidintheproperpositionU0(m2s-2)62636851.7149DynamicshapefactorJ20.001082629832258SphericalharmoniccoefficientsJ4-0.00000237091126SphericalharmoniccoefficientsJ60.00000000608347SphericalharmoniccoefficientsJ8-0.0000000000142722/mabGM0.00344978650678TheEquator’svalueofnormalgravityγe9.7803253361Polarizednormalgravityvalueγp9.8321849379Meannormalgravityγ9.7976432224Latitude45degreesofthenormalgravityvalueγ45°9.80619776952.ThemethodofPointandcoordinate’stransformation(1)ModelselectionThescopeofnationalandprovincialchoosetwo-dimensionalcoordinateconversionsevenparametertransformationmodel;provinciallevelbelowthethree-dimensionalcoordinateconversionoptionorfour-parametermodelforplanarfour-parametermodel.FortherelativelyindependentplanecoordinatesystemandtheChinaGeodeticCoordinateSystemlinksfourparametersmodelcanbeusedflatorpolynomialregressionmodel.CoordinatetransformationmodeldetailedinPartVIofthisguide.(2)CoincidencepointselectionCoincidencecoordinatescanbeusedinthetwocoordinatesaretheresultsofthepointcoordinates.Butintheendoverlappointneededtodeterminetheconversionparametersaccordingtothecalculatedcoincidencecoordinateresiduals,accordingtothesizeoftheresidualstodetermineiftheresidualerrorisgreaterthan3timesremovedinrecalculatethecoordinateconversionparametersuntilsatisfiedprecisionsofar;usedtocalculatethenumberoftransformationparametersandconversionCoincidencesizeoftheregion,butnotlessthanfive.(3)CalculationofmodelparametersCoincidenceidentifiedwiththecoordinatesofthecoordinateconversionmodelmodelparametersusingleastsquaresmethod.(4)Accuracyassessmentandvalidation.Coordinatetransformationwiththeabovemodelmustmeetthecorrespondingprecisionindicators,specificindicatorsandassessmentofaccuracyassessmentmethods,seetheannextorelevantcontent.Selectsomecoincidenceasanexternalcheckpoint,isnotinvolvedinconversionparametercalculation,calculatingthetransformationparametersusingtheconversionpointcoordinatesarecomparedwithknowncoordinatesoftheexternalcheck.Shouldbeselectedatleastsixevenlyspacedpointsonthecoordinatetransformationcoincidesaccuracycheck.(5)CoordinatesofthemidpointofthedatabaseconversionmodelparametercalculationofregionalselectionXi'ancoordinatesystemforthe1980database,usingnationaldataofasetofmodelparameterstomeetthe1:5millionand1:25millionscaledatabaseconversionaccuracy;withthenationaldataofthemodelparametersofthesixregionalmeets1:10000scaledatabaseconversionaccuracy.Forthe1954Beijingcoordinatesdatabaseconversion,usingthenationaldataofthemodelparametersofthesixregionalmeets,and1:25million,1:5millionscaledatabaseconversionaccuracy;by(2°×3°)toCalculationofmodelparameterstomeetthe1:1millionscaledatabaseconversionaccuracy.3.1:2.5-1:25Millionconversionofthedatabase(1)BasicscaletopographicmapsbycountryFramingorganization'sdatabaseBasicscaletopographicmapsbycountrysub-siteorganizationsgraphicsdata(DLG,DEM,DRG),basedonthefollowingprogramtoconvert.1.1:2.5-1:10millionDLGconversionofthedatabase(2)1954Beijingcoordinatesystem1:2.5-1:10milli