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2711)[13]DongD,DickeyJO,ChaoY,etal.GeocenterVar iationsCausedbyAtmosphere,Ocean,andSurfaceGroundWater[J].犌犲狅狆犺狔狊.犚犲狊.犔犲狋狋.,1997,24:1867 1870[14]DaviesP,BlewittG.MethodologyforGlobalGeo deticTimeSeriesEstimation:ANewToolforGeo dynamics[J].犑.犌犲狅狆犺狔狊.犚犲狊.,2000,105(B5):11083 11100[15]JanK.AGuidetoUsingInternationalGNSSServ ice(IGS)Products,GeodeticSurveyDivision,Nat uralResourcesCanada[OL].ftp://igscb.jpl.nasa.gov/components/IGSProducts_user_v17.pdf,2009[16]SteigenbergerP,RomeroI,FangP.ReprocessingIssues,Standardization,New Models[C].IGSWorkshop2006,Darmstadt,Germany,2006犛犲犪狊狅狀犪犾犈犪狉狋犺犇犲犳狅狉犿犪狋犻狅狀犳狉狅犿狋犺犲犆犺犪狀犵犲狅犳狋犺犲犇犲犵狉犲犲1犛狌狉犳犪犮犲犕犪狊狊犔狅犪犱犢犝 犖犪狀1,2 犆犎犈犖犌犘犲狀犵犳犲犻3 犆犎犈犖犌犢犻狀犵狔犪狀21 SchoolofGeodesyandGeomatics,WuhanUniversity,Wuhan430079,China2 ChineseAcademyofSurveyingandMapping,Beijing100830,China3 NationalQualityInspectionandTestingCenterforSurveyingandMappingProducts,Beijing100830,China犃犫狊狋狉犪犮狋:ThisarticleisbasedonSNREIearthmodel,invertingearth'ssurfaceloadmomentofrecent10yearsbyIGSdata,exploredthemechanismofseasonalearthdeformation,andtheresultsindicatethatsurfaceloadmomenthassignificantannualchangesinmx,myandmzdirections,andthenthereexistsobviousseasonaldeformationofthesolidearth.Thephaseinmzdirectionshowsthat,themax imumsurfacemassloadwithinnorthernhemisphereisbetweenFebruaryandMarchofeachyear,andthatofsouthernhemisphereisbetweenAugustandSeptember,theloadmomentoccurswithinChinaduringeveryDecember,whichwillcausethestationswithinChinahaveadownwarddeformationof2mmandalateraldeformationof1mm,andthisinfluenceformaintainingthestabilityofourmillimeter523武 汉 大 学 学 报 · 信 息 科 学 版2015年4月levelCGCS2000referenceframecannotbeignored.犓犲狔狑狅狉犱狊:loadmoment;SNREIearth;loadlovenumbers;powerspectrumanalysis;regressionanalysis犉犻狉狊狋犪狌狋犺狅狉:YU Nan,PhDcandidate,specializesinGNSSdataprocessingandthemaintenanceofGeocentricReferenceFrame.E mail:yunanya11@163.com犉狅狌狀犱犪狋犻狅狀狊狌狆狆狅狉狋:TheNationalHighTechnologyResearchandDevelopmentProgramofChina(863Program),No.2013AA122501;theNationalNaturalScienceFoundation,檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪No.41374014.(上接第517页)[14]DuQingyun,YuChangbin,RenFu.OrganizationTile Map DataBasedon Nested Pyramids Model[J].犌犲狅犿犪狋犻犮狊犪狀犱犐狀犳狅狉犿犪狋犻狅狀犛犮犻犲狀犮犲狅犳犠狌犺犪狀犝狀犻狏犲狉狊犻狋狔,2011,36(5):564 567(杜清运,虞昌彬,任福.利用嵌套金字塔模型进行瓦片地图数据组织[J].武汉大学学报·信息科学版,2011,36(5):564 567犗狉犵犪狀犻狕犪狋犻狅狀犪狀犱犐狀犱犲狓犻狀犵犕犲犮犺犪狀犻狊犿犳狅狉犌犾狅犫犪犾犜犻犾犲犕犪狆犇犪狋犪犝狀犱犲狉犈犿犫犲犱犱犲犱犈狀狏犻狉狅狀犿犲狀狋犔犐犝犃犻犾狅狀犵1,2,3 犇犝犙犻狀犵狔狌狀1 犣犎犃犖犌犇狅狀犵2,3 犆犃犐犣犺狅狀犵犾犻犪狀犵1 犔犐犎犲狔狌犪狀41 SchoolofResourceandEnvironmentalSciences,WuhanUniversity,Wuhan430079,China2 StateKeyLaboratoryofGeo informationEngineering,Xi’an710054,China3 Xi’anResearchInstituteofSurveyingandMapping,Xi’an710054,China4 InstituteofGeospatialInformation,InformationEngineeringUniversity,Zhengzhou450052,China犃犫狊狋狉犪犮狋:Tilemapdataisanimportantdatatypeintheembeddedgeographicinformationsystem,buttheresourcesofcalculation,storageanddisplayareverylimitedinembeddedenvironment.Howtoorganize,storageandindextheglobaltilemapdata,thatisanimportantproblemtobesolvedinem beddedgeographicinformationsystem.Basedontheanalysisoftheconstraintconditions,aresourceconstraintsvariablesetandademandvariablesetofglobaltiledataorganizationaredefined.Then,arestrictiverelationmodeloftilemapdataisconstructedbasedonembeddedenvironment,andanor ganizationmodelforglobaltilemapdataisfurtherproposed.Atsametime,astoragemodeloftilemapdataisdesigned,andatwo dimensionallinearcodingmethodisintroducedtorealizequickquery.Theexperimentsshowthatthedataorganizationmodeliswelladaptedtoembeddedenvironmentes peciallyregardingbothefficiencyandeffectfortilemaps.犓犲狔狑狅狉犱狊:embeddedsystem;tilemap;dataorganizationmodel;storagemodel犉犻狉狊狋犪狌狋犺狅狉:LIU Ailong,PhDcandidate,associateprofessor,specializesintheembeddedGIS.E mail:ailong_liu@163.com犉狅狌狀犱犪狋犻狅狀狊狌狆狆狅狉狋:TheNationalNaturalScienceFoundationofChina,No.41371427.