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Question:

Where can I find the solar exoatmospheric spectral irradiances (ESUN) for the Landsat 1-5 MSS, Landsat 4-5 TM, and Landsat 7 ETM+ sensors?

Answer:

The currently recommended ESUN values (in W/m2/μm) are listed in the table below. These values used with Landsat products currently generated at EROS ensure consistent radiometric calibration of data from all these sensors. Note that although the data are consistently calibrated, calculated TOA reflectance over the same target may differ among the sensors due to the spectral bandpass differences.

Band # Landsat 7 ETM+ Landsat 5 TM Landsat 4 TM Landsat 1-5 MSS
1 1970 1958 1958 1848
2 1842 1827 1826 1588
3 1547 1551 1554 1235
4 1044 1036 1033 856.6
5 225.7 214.9 214.7  
7 82.06 80.65 80.70  
8 1369      

The Landsat 5 MSS values are used for all MSS instruments. This was the result of cross-calibration of all the MSS sensors to match the Landsat 5 instrument.

All ESUN values are derived from the ChKur spectrum. The ChKur spectrum is the combined Chance-Kurucz Solar Spectrum within MODTRAN 5 (2011, Berk, A., Anderson, G.P., Acharya, P.K., Shettler, E.P., MODTRAN 5.2.0.0 User's Manual).