欢迎来到天天文库
浏览记录
ID:36410978
大小:7.13 MB
页数:73页
时间:2019-05-10
《DEM质量检查与精度评定研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
此文档下载收益归作者所有