12619.小比例尺地貌暈渲圖生成方法研究與實(shí)現(xiàn)

1、獨(dú)創(chuàng)性聲明本人聲明所呈交的論文是我個(gè)人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作及取得的研究成果。盡我所知，除了文中特別加以標(biāo)注和致謝的地方外，論文中不包含其他人已經(jīng)發(fā)表或撰寫過的研究成果，也不包含為獲得北京林業(yè)大學(xué)或其它教育機(jī)構(gòu)的學(xué)位或證書而使用過的材料。與我一同工作的同志對(duì)本研究所做的任何貢獻(xiàn)均已在論文中作了明確的說明并表示了謝意。簽名：關(guān)于論文使用授權(quán)的說明本人完全了解北京林業(yè)大學(xué)有關(guān)保留、使用學(xué)位論文的規(guī)定，即：學(xué)校有權(quán)保留送交論文的復(fù)印件，允

2、許論文被查閱和借閱；學(xué)?？梢怨颊撐牡娜炕虿糠謨?nèi)容，可以采用影印、縮印或其他復(fù)制手段保存論文。佑墻的論文在解密后應(yīng)遵守此規(guī)定)簽名：／醯鱈導(dǎo)師簽名：趁隧EtABSTRACTTheResearchandImplementationofSmall—ScaleReliefShadingMasterCandidate：ChenXingyu(ComputerSoftwareandTheory)DirectedbyXuQiuhongAbstrac

3、tTerrainisoneofthemostbasicelementsofgeographicinformation，shadedreliefisthemostcommonlyusedandintuitivetypeforrepresemingtheterrainReliefshadingdependsonthreebasicprinciples，principleofgeometricaloptics，principleofhalft

4、oneandprincipleofaerialperspectiveWiththedevelopmentoftechnologyshadedreliefderivedautomaticallyfromcomputerhasbeentakentheplaceoftraditionalmanualshading，whichcalculatingthegreyvalueofonepointthroughilluminationmodelIti

5、sfasterandlessexpensivebutthemanualshadingisstillsuperiortotheautomaticshadingiIlthreedimemionalreliefimpressionNowadays，therearemanyimprovementschemehavebeendevelopedforautomaticreliefshading，forexample，adjustmentofligh

6、tdirectionorexaggeratingtheelevationWhengeneratingthesmallscaleshadedreliefcorrectingtheDEM’SdataisnecessaryTheshadedreliefgeneratedfromDEM’Sdataisusuallydisturbedbytopographicdetailsthatimpairtheportrayalofthemainrelief

7、features，especiallyinsmallscaleshededreliefthetraditionalmethodssuchasresampling，WaveletTransformsorisotropicfilterhavesomeshotagesThispaperproposesanovelmethodforsmall—scalereliefshading，whichcouldremovethedisturbingtop

8、ographicdetailsFirstlytheDEMdatawerefilteredunitarily；Thentheterrainfeaturesareexaggeratedordeepenedbasedoncurvature；AtlastreliefshadingfromtheprocessedDEMdataExperimentshaveshownthevalidityofthismethod，whichhaseffective