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PCMODTRANTutorialHowtomakeanatmosphericmodelin47easysteps.FindMODTRANandstartit•ThePcModwin4.0iconshouldbeonthedesktop,andyoudoubleclickonittogetConfiguremodelinputdata•SelectModtranInput-ModelAtmosphere(1)Modelatmosphereparameters•SelectmodelAtmosphere-1976U.S.Standard•SelectTypeofAtmosphericPath-SlantPath•SelectModeofExecution-TransmittanceHitNext!•AtmosphericColumnparameters–hitNext!•Aerosols(notethatwe’reusingRural,with23kmvisibility)–HitNextGeometryandSpectralBand(3)lotstodohere•Manypathtypes,usedefault•Observerheight–60km•FinalHeight–0km•ZenithAngle–180degrees•InitialFrequency0.5microns•FinalFreq2.9microns•Next!Sanitycheckdiagram•Themodelparametersarereproducedheretomakesurethattheprogramisconfiguredcorrectly.•Modelparametersattop•NotediagramshowingviewinggeometryRunthemodel•SelectRunModel-RunModtran•Wait….•HitanykeytocontinuePlotthatpuppy.•SelectPlot-Interactive•SelectMODOUT2•ChangeX-axistoMicrometers,hitokayWaitforittoplottwice•NowwehaveaplotoftransmissivityintheVNIR,andyoucananswerthequestionsinlab.Ohwait,perhapsalittlemoredirectionwouldbehelpful.•Firsttrick.ClickingontheplotwillshowtheXandYlocationyou’veclickedontheupperleftcorner.Thisisprobablyallyouneedtoanswerthefirstquestion.MorePlottingTricks•Ifyou’reoneofthosetypeswhohastohavetheexactanswer,youcanadjusttheplottingparametersasyoulike.•SelectPlot-EditPlot•Forexample:Autoscale:OFFMinX=1,MaxX=1.1XDecimal=2(youmighthavetofiddlewithXDivisionstoo)willyieldABeautifulButterflyofaPlot•Sothatyoucangetridiculouslyexactaboutansweringthequestionsinthelab.•Forexample:Autoscale:OFFMinX=0.938,MaxX=0.946XDecimal=5willyieldtheplotonthenextpageStillmoreplottingtricks•Therearealsowaystoplotonedatasetoveranother,andvariousotherthingsthatyoushouldmessaroundwith,butfirstanswerthefirstquestioninthelab.Thengotothenextpagetodothetropicalmodel,andanswerthosequestions.TropicalModel•ClickonCard1Input•WhichbringsupthedialogboxModelAtmosphere(1)•SelectModelAtmosphere-TropicalModel•Hitokay,andrunthemodelagain.PlotitandfillintheblanksontheanswersheetforTropicalmodel.