基于小波變換的DEM多尺度綜合研究.pdf

1、蘭州大學碩士學位論文基于小波變換的DEM多尺度綜合研究姓名：李含璞申請學位級別：碩士專業(yè)：地理學、地圖學與地理信息系統(tǒng)指導教師：馬金輝20060501AbstractWithconstantenlargementoftheapplicationdomainofGISandtheincreasingneedforGIStheapproachofapplying舢1ti—scalespatialdatatotheobservationand

2、analysisofgeographicphenomenafromdifferentperspectivesbecomesmoreandmoreimportantMulti—scaleprocessingandrepresentationofspatialdatahasbecomethecrucialelementofbuildingmulti——scalespatialdatabaseandaccomplishingmulti——sc

3、aleGISorScale——freeGISAndtheestablishmentofthescale—dependentspatialdatarepresentationmodelandtherealizationoftheauto—generalizationofgeographicinformationisthekeytechnologyofresolvingmulti～scaleprocessingandrepresentati

4、onofspatialdataMulti—ResolutionAnalysis(MRA)notionofwavelettheoryhasstrikingsimilaritywithmulti～scalerepresentationofspatialdataInthisthesis，basedonthedeepanalysisoftheessenceoftherepresentationofmulti—scalespatialdata，t

5、heauthorputsforwardtheapproachofusingwaveletmulti—resolutionanalysistheorytoanalyzethegeographicspacefrommultipliedscaleThemultiscaleauto—generalizationandtheconsecutiverepresentationofDigitalElevationModel(DEM)canbeachi

6、evedbybuildingandmaintainingdynamicalIyasubsequenceofmulti—scalenestedgeographicspaceandthescaledependentrepresentationmodelofspatialdataThereforethenotionofwavelettransformtheoryandtheMRAareillustratedindetailatthebegin

7、ningofthisthesisThen，thethesisfurtherexplorestheexpediencyofwaveletformulti—scalegeneralizationDEM，theprocessingwayofDEMboundariesandtheselectedstandardofthresholdforthewaveletdecomposedhighfrequencycoefficient，whichsupp