外文文献翻译 现有测绘成果转换到中国2000大地坐标系.doc

附录1英文原文

ConversionofexistingmappingresultstotheChinaGeodeticCoordinateSystem2000

Chinaisavastareaofthecountry,duetohistoricalreasons,ChinasadoptionoftheBeijing54coordinatesystem,suchasXian80coordinatesystemcoordinates.Withthemappingtechnologyknownas2000,Chinaestablishedanationalgeodeticcoordinatesystemoftheearthcoordinatesystem.Thiswillbetheextentpossible,onChinasachievementshavebeenconvertedtothenewmappingcoordinatesavarietyoftheoreticalmethodstobelearningfromindustrypeers.

1.DefinitionoftheChinaGeodeticCoordinateSystem2000

NationalGeodeticcoordinatesystemisdefinedtoincludetheoriginofcoordinates,threeaxesofdirection,scale,andtheearthellipsoidfourbasicparametersofthedefinition.ChinaGeodeticCoordinateSystemorigintoincludetheoceansandatmospherewholeEarthscenterofmass;ChinaGeodeticCoordinateSystemZaxispointingtotheoriginalEpoch2000.0oftheEarthsdirection,theepochofthepointbytheInternationalBureauoftimeepoch1984.0settheinitialpointfortheprojections,thetimeevolutionoforientationrelativetothecrustdoesnotguaranteetheglobalresidualrotation,X-axispointingtotheoriginalpointofreferenceGreenwichmeridianandtheEarthequatorialplane(epoch2000.0)oftheintersection,Y-axisandZaxis,Xaxistotherighthandorthogonalcoordinatesystem.Withgeneralrelativityinthesenseofscale.ChinaGeodeticCoordinateSystemusedintheearthellipsoidparametersvaluesare:

Longaxlea＝6378137m

Flatratef=1/298.257222101

GravitationalconstantGM＝3.986004418×1014m3s-2

Angularvelocityω＝7.292l15×10-5rads-1

Otherparametersasfollows:

Shortradiusb(m)

6356752.31414

Polarradiusofcurvaturec(m)

6399593.62586

Thefirsteccentricitye

0.0818191910428

Squaredoffirsteccentricitye2

0.00669438002290

SecondEccentricity

0.0820944381519

SquaredofSecondEccentricity2

0.006739496775