国家测绘基准“十二五”重大项目的思考

3410200910GeomaticsandInformationScienceofWuhanUniversityVol.34No.10Oct.2009:2009208205:167128860(2009)1021135204:A12(1,,100830)(2,1,100044):,,,,,2000,,,;,,GPS,5cm:;;;;;;:P224.1;P228.42121,1.1[124](GNSS)GPSGLONASSGPS2009410L5GPS3(L1L2L5)GPS2020GPS33GPS(HEO)(GEO)GPS,GPS,GPS3GPS(L1L2L5)4,GLONASSGPS,,GLONASS24,GLONASS2011,2017,30GLONASS2MGLONASS2K,20m1mGNSS(GPS/GLONASS/Galileo/)90,GPSGPS2020,GPS30;GLONASS2017GLONASS24;Galileo242013;2012,12,2020,30,1020[5]20091015m1.220084,EGM2008[6],55,21902159GRACE,83.8%,,CHAMPGRACE,,EGM2008,,11mGal,27cm,,EGM2008,,2009GOCE,CHAMPGRACE,,1mGal2cm,121,:,GNSS,,,22.1CGCS200021,21,[5],2008712000(CGCS2000),5480CGCS2000,,,,CGCS2000,CGCS200,,CGCS2000,,,(GNSS)(CORS)[729]2.2GNSSCORSGNSSCORS[10212]:GNSSCORS,8;[10],25,2011260;20,GNSSCORS[12]2.3GNSSCORS[728]1)GNSSCORS2004,GNSSCORS2006,GNSSCORSGNSSCORSGNSSCORS,GNSSCORS,,GNSSCORS63113410:,,GNSSCORS,2)GNSSCORSGNSSCORS,,GNSSCORS,,GNSSCORSGNSSCORS,GNSSCORSCORS,,CORS,,GNSSCORS,,GNSSCORS,GNSSCORS,2.4GNSSCORS[7]GNSSCORS,(),1)GNSSCORS:2000CGCS2000;;;GNSSCORS;GNSSCORS2)GNSSCORSCORS,,:CORS,,CGCS2000;dmm(RTKPPP),;CORSGNSS(IGS),GNSSCORS;CORSCORS3)GNSSCORS:;,,CORS;CORS,CORS,CORS;GNSSCORS,GNSSCORS33.11954,54195619501956,56198719521979,19a,1a10,85,1955197619771988,9.3km,13.7km()5.3,1/(15km15km)20901985,,25a7311200910,,,,20,,,,,GNSS,3.2,,,1985,,;cm()1):,(cm)10014010km12km,1/(30km30km)2)cmGNSS,,dm(CQG2000)[13],,1515,110000,cm,CQG2000,0.30.6m0.1m,155,,,GPS[1].GPS[C].,,2008[2],,.[J].,2007,27(5):21224[3]HeinGW,RodriguezJA,WallnerST,etal.En2visioningaFutureGNSSSystemofSystems:Part1[J].InsideGNSS,2007,43:1502162[4]GaoGX,HengL,LoreneD,etal.ModernizationMilestone,ObservingtheFirstGPSSatellitewithanL5Payload.InsideGNSS,2009(7):30236[5]HuangYusheng,HuangYunwen,ChiangKaiwei.TheBenefitsofFutureGNSS[J].Coordinates,2007(8):21238[6]PavlisNK,HolmesSA,KenyonSC,etal.AnEarthGravitationalModeltoDegree2160[C].EGM2008,the2008GeneralAssemblyoftheEuro2peanGeosciencesUnion,Vienna,Austria,2008[7],,,.[J].,2007,36(4):3662369[8].[J].,2007,27(1):126[9],.[J].,2003,6(28):2592264[10],,,.[J].,2002,8(22):88[11],,,.[J].,2003,(9):33236[12],,.[J].,2008,34(1):20225[13],,,,[J].,2001,30(2):952100:,,,170,9E2mail:[e-mail](1154)8311200910TheModelofTerrainFeaturesPreservedinGridDEMWANGChun1,2TANGGuoan1LIUXuejun1TAOYang1(1LandInformationEngineeringDepartment,ChuzhouUniversity,80SouthFengleRoad,Chuzhou239012,China)(2ChinaKeyLaboratoryofVirtualGeographicEnvironment,MinistryofEducation,NanjingNormalUniversity,1WenyuanRoad,Nanjing210046,China)Abstract:AnewDEMwhichiscalledfeaturespreservedGridDigitalElevation(F2DEM)isproposedinthispaper.TheF2DEMisbasedontheVectorizingsimulationandrasterizingorganizationmethodandcombinescharacteristicsbothoftheterrainthephysicalobjectsbyapplyingtheobject2orientedtechnology.Throughabstractlydescribingterraincharacteristicsbasedontheirmorphologyandseamlesslyembeddingterrainfeaturesinformationintogener2algriddatawithsegmentationtechnology,F2DEMsnotonlycanmaintainthestructuralin2tegrityofgridDEM,overcomethedisadvantageofimprecisionterraindescriptioninsomeplacescontainingbreakterrainfeatures,butalsocankeepitsefficiencyofterrainsimulationwithpreservedfeatures,whichisofcriticalsignificancetoresearchhigh2fidelityDEMs.Keywords:DEM;F2DEM;accuracy;fidelity;datamodelAboutthefirstauthor:WANGChun,Ph.D,associateprofessor,majorsinuncertaintyofdigitalterrainanalysisandapplicationofDEM.E2mail:[e-mail](1138)OntheNationalProjectsforSurveyingandMappingDatumintheTwelfthFiveYearPlanofChinaCHENJunyong1ZHANGPeng2(1StateBureauofSurveyingandMapping,Baiwanzhuang,Beijing100081,China)(2StateFundamentalGeographicalInformationCentre,1Baishencun,Zizhuyuan,Beijing100044,China)Abstract:ConsideringtherapiddevelopmentofeconomyandsocietyinChina,aswellasthegreatprogressinspaceandinformationtechnology,thedigitalsurveyingandmappingto2wardsinformationsurveyingandmappingwillbecarriedoutinthe12thFiveYearPlanofChina.Inhorizontaldatum,baseontheChineseGeodeticCoordinateSystem2000,thena2tionalcontinuousoperationreferencestationnetworksshouldbecompleted.Itisnecessarytoformtheenoughandrationaldistributedcontrolpointsforthenationalgeodeticcoordinateframe,anditcanalsohelpalltradesandprofessionstocompletethetransformationtaskofgeocentric3Dcoordinationsystem.Inverticaldatum,thetaskformeasuringthe3rdNational1storderlevelingnetworkshouldbecompleted.CombingwithGPSlevelingandsatelliteal2timeter,theChinesegeoidof5resolutionandcmmagnitudeaccuracyshouldbecalculated.Keywords:horizontaldatum;coordinatesystem;coordinatesframe;verticaldatum;hori2zontalnetwork;geoid;globalnavigationsatellitesystemAboutthefirstauthor:CHENJunyong,professor,Ph.Dsupervisor,AcademicianofChineseAcademyofSciences,majorsingeodesy.Hehaspublishedmorethan170papersand9books.E2mail:[e-mail]4511