Landsat8中心波長及輻射定標

TM數(shù)據(jù)各波段中心波長值/波譜寬度即wavelength/FWHMLandsat1-5WavelengthFWHMTM1:0.485州/0.066TM2:0.569八m或0.56 /0.082TM3:0.660叩/0.067TM4:0.840八m或0.83 /0.128TM5:1.676州或1.65 /0.217TM7:2.223八m或2.22 /0.252TM6:11.4(im表1Landsat 5各波段參數(shù)波段號波段頻譜范圍(gm) 分辨率(m)0.45B1Blue— 0.52 30B2Green0.520.60 30一0.63B3Red― 0.69 300.76B4Near:IR— 0.90 301.55B5SWIR— 1.75 30B6LWIR10.40—12.5 120B7SWIR2.08—2.35 30Landsat1-5表3美國USGS發(fā)布的Lmax與Lmin值波段LmaxLmin1 -1.52193.002 -2.84365.003 -1.17264.004 -1.51221.005 -0.3730.206 1.237815.30327 -0.1516.50表4Landsat5TM數(shù)據(jù)頭文件中的Lmin與Lmax值波段LmaxLmin1.26880 -0.01002.98126 -0.02321.76186 -0.00782.81771 -0.01930.65277 -0.00803.20107 0.259940.44375 -0.0040

表5TM數(shù)據(jù)波段對應波譜寬度波段號頻譜寬度10.06620.08230.06740.12850.21770.252Landsat7Landsat7波段波長范圍(gm)中心波長地面分辨率1blue0.45?0.5150.48330米2green0.525?0.6050.56030米3red0.63?0.6900.66230米4NIR0.75?0.900.83530米5swir11.55?1.751.64830米610.40?12.5060米7swir22.09?2.352.20630米8pan0.52?0.900.7115米Landsat8OLI 傳感器的技術(shù)指標OLI陸地成像儀包括9個波段，空間分辨率為30米，其中包括一個15米的全色波段，成像寬幅為185x185km。OLI傳感器高度為761km， 軌道高度為705km。OLI包括了ETM+傳感器所有的波段， 為了避免大氣吸收特征，OLI對波段進行了重新調(diào)整，比較大的調(diào)整是OLIBand5(NIR)(0.845-0.885Pm)排除了0.825叩處水汽吸收特征；OLI全色波段Band8波段范圍較窄，這種方式可以在全色圖像上更好區(qū)分植被和無植被特征；此外，還有兩個新增的波段：藍色波段 (band1;0.433-0.453Pm主要應用海岸帶觀測，短波紅外波段(band9;1.360-1.390Pm)(卷云波段)包括水汽強吸收特征可用于云檢測；近紅外band5和短波紅外band9與MODIS對應的波段接近。

表1：OLI陸地成像儀OLIOLI陸地成像儀(Landsat8)ETM+(Landsat7)序號 波段(Pm)1costalaerosol 0.433-0.453空間分辨率(m)30序號 波段(gm)空間分辨率(m)2blue 0.450-0.515301blue 0.450-0.515303green 0.525-0.600302green 0.525-0.605304red 0.630-0.680303red 0.630-0.690305NIR 0.845-0.885304NIR 0.775-0.900306swirl 1.560-.660305中紅外 1.550-1.750307swir2 2.100-2.300307中紅外 2.090-2.350308pan 0.500-0.680158全色 0.520-0.900159短波紅外(cirrus) 1.360-.390306熱紅外 10.40 12.5060TIRS負責人說，LandSat-8上攜帶的TIRS載荷，將是有史以來最先進，性能最好的TIRSoTIRS將收集地球兩個熱區(qū)地帶的熱量流失，干旱地區(qū)。目標是了解所觀測地帶水分消耗，特別是美國西部表2：TIRS載荷參數(shù)Band# 中心波長(gm)最小波段邊界(gm) 最大波段邊界(gm)空間分辨率(m)10 10.910.611.210011 12.0Landsat8中心波長波段號頻譜寬中心波長度波段 0.4431 0.02波段2 0.065 0.4825波段3 0.075 0.5625波段4 0.05 0.655波段5 0.04 0.865波段6 0.1 1.610波段7 0.2 2.200波段8 0.18 0.64波段9 0.03 1.375波段10 10.9波段11 12.011.512.5100

Landsat8OperationalLandImager(OLI)andThermalInfraredSensor(TIRS)LaunchedFebruary11,2013BandsWavelength(micrometers)Resolution(meters)中心波長FWHMBand1-Coastalaerosol0.43-0.45300.440.02Band2-Blue0.45-0.51300.480.06Band3-Green0.53-0.59300.560.06Band4-Red0.64-0.67300.6550.03Band5-NearInfrared(NIR)0.85-0.88300.8650.03Band6-SWIR11.57-1.65301.610.08Band7-SWIR22.11-2.29302.20.18Band8-Panchromatic0.50-0.68150.590.18Band9-Cirrus1.36-1.38301.370.02Band10-ThermalInfrared(TIRS)110.60-11.19100Band11-ThermalInfrared(TIRS)211.50-12.51100Landsat8 的定標參數(shù)定標公式Lk=MLQcai+ALConversiontoTOARadianeeOLIandTIRSbanddatacanbeconvertedtoTOAspectralradianeeusingtheradianeerescalingfactorsprovidedinthemetadatafile:L2MLQcai+ALwhere:L入 =TOAspectralradianee(Watts/(m2*srad* Pm))Ml =Band-specificmultiplicativerescalingfactorfromthemetadata(RADIANCE_MULT_BAND_x,wherexisthebandnumber)Al =Band-specificadditiverescalingfactorfromthemetadata(RADIANCE_ADD_BAND_x,wherexisthebandnumber)Qcal =Quantizedandcalibratedstandardproductpixelvalues(DN)如：以下為某副LC8圖像的定標參數(shù)BandLMINLMAXMLAL1-63.41055767.865171.2685E-02-63.423242-64.66208783.020391.2935E-02-64.675013-59.20865716.982541.1844E-02-59.220494-50.14610607.240301.0031E-02-50.156135-30.42921368.480166.0871E-03-30.435306-7.6666492.83861（算法沒有改變）1.5336E-03-7.668187-2.4939430.200234.9889E-04-2.494448-56.48641684.017821.1300E-02-56.497719-12.50463151.423782.5014E-03-12.50713100.1003322.00180110.1003322.00180ConversiontoTOAReflectaneeOLIbanddatacanalsobeconvertedtoTOAplanetaryreflectaneeusingreflectaneerescalingcoefficientsprovidedintheproductmetadatafile(MTLfile).ThefollowingequationisusedtoconvertDNvaluestoTOAreflectaneeforOLIdataasfollows:

where:pk=MpQcal+Apwhere:pk=MpQcal+App去

thatp入Mdoesnotcontainacorrectionforthesunangle.=Band-specificmultiplicativerescalingfactorfromthemetadata(REFLECTANCE_MULT_BAND_x,wherexisthebandnumber)Ap =Band-specificadditiverescalingfactorfromthemetadata(REFLECTANCE_ADD_BAND_x,wherexisthebandnumber)Qcal =Quantizedandcalibratedstandardproductpixelvalues(DN):帶太陽角度校正的大TOAreflectaneewithacorrectionforthesunangleisthen:帶太陽角度校正的大氣層頂反射率1pA 1pA^入 =cos（0sz） sin（BSE）Sz是指太陽天頂角solarzenithangle,se是指太陽高度角 sunelevation。太陽天頂角與太陽高度角互余， Sz=90-se。產(chǎn)品類型Leve