The CalculationofEmissivity in LST

1、1The Calculation of Emissivity of ground in Retrieving LST2contents:1.Why do we need do this work? 2. The calculation of emissivity of ground3. Conclusion1.Why do we need do this work?323131313232323131 32()()/()sTCBDCDBC AC Axpressed as:3131 31313131 3131313131313131313232 32323232 32323232320.1378

2、70.1378731.6567731.65677(1)(1(1)0.13787(1)(1(1) 31.656770.118490.1184926.5003626.50036(1)(1(1)ABTCDABTC 323232320.11849(1)(1(1)26.50036Dhere,we have six unknown parameters :we have to calculate threeparameters in band 31 and band 32, respectively.313231323132,TT， ,T subscript “31” and “32” are repre

3、sent the band 31 and band 32 , respectively.3flow chart of retrieving LST is:3132,3132,3132,TTEcalculation of emissivity42. The calculation of emissivity53132, Valuebandvegetationsoilwaterband 310.9720.9860.992band320.9760.9910.988Table 1. The approximate value of the three components in band 31 and

4、 band 32, respectively 6 Valuewaterband 310.992band320.988313131323232(1)(1)vvvvssvvvvssP RP RP RP R Valuevegetationsoilband 310.9720.986band320.9760.9917313131323232(1)(1)vvvvssvvvvssP RP RP RP R0.93320.05850.99020.1068vvsvRPRP 8 ()/()vsvsPNDVINDVINDVINDVINDVIv =0.65 NDVIs =0.05(B2-B1)/(B2+B1)NDVIand NDVI is calculate from:93. Conclusionemissivity of groundwater pixelsMixed pixelspixel typesTable 1(B2-B1)/(B2+B1)NDVI()/()vsvsPNDVINDVINDVINDVI0.93320.05850.99020.1068vvsvRP