土地整理項目中空間數(shù)據(jù)的精度分析.pdf

1、中國農業(yè)大學碩士學位論文土地整理項目中空間數(shù)據(jù)的精度分析姓名：張春再申請學位級別：碩士專業(yè)：土壤學指導教師：張瑋20040601AbstractTheprecisionofspatialdataisanincreasingconcertioverquantificationaboutlandconsolidationTherearesomeimpendingproblemsonquantifieddescriptionoflandcon

2、solidationusing“3S”technology：(1)Inmanyregionswherethebigscaleisabsent，howtesolvetheproblemaboutthegeometriccorrectionofthehighprecisionremotesensingimage；(2)theoriginaldataandtheinterpolatingmethodarethetwomainfactorsth

3、ataffecttheprecisionofDEM，howeverthespatialdatahasnotruevalue，theproblemishowtoobtainthetruevalueandtoanalyzetheeffectoftheoriginaldataandinterpolatingmethodontheprecisionofearthwork；(3)whencalculatingtheearthworkthrough

4、DEMthatareconstructedbyvectoringthereliefmap，howtoimprovetheaccuracyoftheearthworkbyadvancedtechnologySincetheerrowistheinherentattributeofthespatialdataitcannotbecompletelyeliminatebuttoimprovethedataaccuracystepbystepT

5、herefore，itisofimportantsignificancetodiscusstheeffectofdifferentinterpolatingmethod，howtoobtaintheoriginaldata，andthesourcesoferrorsontheprecisionofdataInthisstudyfirstlythehighresolutionremotesensingimage，whichwasgeome

6、tricallycorrectedbythebigscalereliefmap(1：500andl：2000)，wastakenasthefoundationtoanalyzethecorrectionprecisionofthehi曲resolutionremotesensingimagethatwasgeometricallycorrectedbythepointsofGPSSecondlytwophysicalmodelswere

7、constructed，whichcouldmodelroughsurfaceanddescribethefeaturesoftheearthsurface，suchaschine，neckvalleyandhill，etcAccordingtodifferencemethod，the‘true”volumeofthephysicalmodelsweremeasured，whichwas13260cm’andregardedasthea

8、nalysisfoundationoftheprecisionofthevolumethatwascalculatebyDEMThediscretedadaofthemodelsonaregularspacingof1cmwerecollectedby3SPACEFASTRAKandtheDEMwasobtainedbyinterpolatingthediscretedadathroughGISsoftwareBasedonthevol

9、umeofthemodelscalculatedbyDEM，differentinterpolatingmethods(IDW’Spline，NaturalNeighburandKrigin曲andvariationofgridspacingofdatawerecomparedandtheireffectsonprecisionofvolumecalculationwereanalyzedSomereferencepointswerem

10、easuredbythehighprecisionGPS(RTK)toexaminetheprecisionoftheDEMTheelevationdifferencebetweenmeasuredandinterpolatingdatawasusedtoconstructtheDEMandcalculatetheerrorofthevolumeAndthentheprecisionoftheearthworkcouldbeimprov

11、edTheresultsshowedthat：(1)somegoverningpoints，whichweremeasuredbysubmeterprecisionGPS，wereutilizedtocorrectthe1mprecisionremotesensingimageanditcouldsatisfythedesiredprecisionofgeometricalcorrection，therefore，thismethodc

12、ouldbeusedasgeometricalcorrectionintheregionwherewasshortofthebigscalereliefmap；(2)thedensityoftheoriginaldatawasthemainfactortoaffectprecisionofthevolume，andtheprecisionofthecalculatedvolumeofearthworkcouldbeimprovedtom

13、orethan90％whenusingthetestpointsandfeatuiepoints；thesparserthedatadensitywere，moresignificantcouldbeimproved；OnthebasethatelevationoftestpointsweremeasuredbythesubmeterprecisionGPS，theerrorofthevolume，whichwasproducedbyv