DEM质量检查与精度评定研究

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1、西南交通大学硕士学位论文DEM质量检查与精度评定研究姓名：肖雁峰申请学位级别：硕士专业：大地测量学与测量工程指导教师：齐华20080501西南交通大学硕士研究生学位论文第1I页AbstractSpatialdataqualityhasadirectimpactontheapplicationofGIS．DEMisoneofNation’SFundamentalGeogmphieInformation，anditsqualityhasbeenincreasinglybecomingpeople’Sfocus．ForanyDEMproject，precision，eff

2、iciency,andbenefitarethreemainfactorst0beconsidered．Amongthesefactors，precisionismostimportant．ProvidedthatprecisionCan’tbeguaranteed，efficiencyandbenefitcan'tbegained．Therefore，theprecisionofDEMhasgainedmoreandmoreresearcher’Sattention．TheresearchofDEM’Squalityhasboththeoryandapplicat

3、ionsignificance．Basedonthesystematicanalysisoferror’Sgeneration，propagationanduncertainty,anddetailedsummarizationandanalysisofmanyDEMqualityinspectionandprecisionvaluationmodels，thisthesismainlyresearchedintogrosserrordetectionforgridDEM．Itsmaincontentsaresummedupasfollows．1)Thethesis

4、hadbroughtrobustestimationintobendsurfacefittingalgorithmandcomparedtheeffectofleastsquaressurfacefittingalgorithmwithrobustestimationofleastsquaressurfacefittingalgorithm．2)Thethesisalsoputforwardamethodofgrosserrordetectionconsideringthetopographiccharacteristic，themethodextractedmpo

5、graphicfeaturepointandemployed‘subsectioncurvefittingalgorithmandrobustestimationofleastsquaressurfacefittingalgorithmfortopographicfeaturepointandcommontopographicpo缸respectively．ItisshownthatrobustestimationofleastsquaressurfacefittingalgorithmforgridDEMcallreducegrosserrorstOacertai

6、nextent．Soithasabetterresulttoo．IthasreducedtheinfluenceoftopographicfeaturepointonDEMgrosserrordetectiontoemploydifferentgrosserrordetectionmethodsfortopographicfeamrepointandcommontopographicpointrespectively．Furthermore，wealsodevelopedallapplicationsystemofDEMqualityinspectionandpre

7、cisionevaluationwithVisualBasic6．0+ArcEngineOnthebasisoftopographicmaps．BesidesbasicGISfunctions，thesystemhasrealizedsome西南交通大学硕士研究生学位论文第1II页specialfunctionswhicharelistedasfollows：grosserrorsdetectionforgridpoints，interpolationprecisionevaluation，chartjunctionprecisionevaluationandc