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1、南京大学学报(自然科学)第42卷第6期Vol.42,No.6JOURNALOFNANJINGUNIVERSITY2006年11月Nov.w2006(NATURALSCIENCES)36S模式对EOS/MODIS数据进行大气校正的方法1,2133221徐萌,郁凡,李亚春,焦圣明,王成刚(1.南京大学大气科学系,南京,210093;2.江苏省气象台,南京,210008)摘要:探讨了运用6S模式对EOS/MODIS的可见光与近红外通道数据进行大气校正的方法和步骤,对模式中的大气模式参数和廓线的计算方法
2、提出了改进,应用研究目标地的气象探空资料计算包括气压、温度、水汽密度和臭氧密度等大气参数和廓线,并根据海拔高度对大气廓线进行订正.实验表明:校正后的象元反射率普遍增大,反射率区间明显拉宽,表现在图像上亮度有所提高,对比度明显增加,图像层次更加丰富,图像质量得到较大改善.关键词:大气校正,6S模式,EOS/MODIS,反射率中图分类号:TP751.1TheMethodofAtmosphericCorrectionontheEOS/MODISDatawith6SModel1,21221XuMeng,
3、YuFan,LiYa2Chun,JiaoSheng2Ming,WangCheng2Gang((1.DepartmentofAtmosphereSciences,NanjingUniversity,Nanjing,210093,China;2.JiangSuMeteorologicalObservatory,Nanjing,210008,China)Abstract:EOS/MODISasanewopticalremotesenseinstrumentcanprovidemuchinformati
4、onabouttheEarth,cloud,atmosphere,ocean,vegetation,etc.,andcanbeusedtomonitorthenaturaldisasterandecologicalenvironmentandtostudythechangeofglobalcircumstanceandclimate.Buttheradiationfromsunisabsorbedandscatteredbytheatmospherewhenitpassestheaerosphe
5、relayer.Atthesametime,thelongwaveradiationreflectedbygroundisalsoabsorbedandscatteredbyatmosphere.Sotheradiationsignalreceivedbythesensoronsatellitewillbedistortedandattenuated.Thereforethesatellitedatamustbeperformedunderatmosphericcorrectionbeforet
6、heremotesenseimagecanbeanalyzed.6Smodel(thesecondsimulationofthesatellitesignalinthesolarspectrum)isbasedonthetheoryofradiativetransferandanalyzesthelandform,weather,spectrumandmanyotherkindsofparameterssynthetically.Themodelisnotaffectedbythestylean
7、dbackgroundoftargetandithaspreferableprecisionandcanbewidelyapplied.Thispapertriedtouse6SmodeltofinishtheatmosphericcorrectionofthevisiblelightandnearinfraredbanddataofEOS/MODIS.Itprobedintothemethodandstepsandimprovedthecalculationmethodofatmospheri
8、cmodelparameterandprofileinthe6Smodel,whichmeanttheauthorsappliedtheweathersoundingballoondataoftargetareaintothemodeltocalculatetheatmosphericparameterandprofileincludingtheairpressure,temperature,vapordensity,ozonedensity,etc.Themethodlocalizedthea
