R to BT

[jianjun shi]

Dear rttov
Hi.
Thank you for reading this question. Can you give me an reference paper introducing the formula for band correction coefficients? It involves the use of these coefficients in the coefficient file, about how to convert radiation to brightness temperature, because I am using other models to calculate radiation ​​and i need to convert it to BT.
Thanks a lot.
! Central wavenumber
! Band correction coefficients (offset, slope)
! Gamma correction factor
7 1 0.2575766922E+04 0.4646583238E+00 0.9993393298E+00 0.1000000000E+01
8 1 0.1609241146E+04 0.1603677295E+01 0.9965741513E+00 0.1000000000E+01
9 1 0.1442079287E+04 0.2977269275E+00 0.9992991379E+00 0.1000000000E+01
10 1 0.1361386785E+04 0.5478901431E-01 0.9998645858E+00 0.1000000000E+01
11 1 0.1164443126E+04 0.1305110617E+00 0.9996319275E+00 0.1000000000E+01
12 1 0.1038108374E+04 0.8704488707E-01 0.9997290506E+00 0.1000000000E+01
13 1 0.9613326055E+03 0.8505303637E-01 0.9997164602E+00 0.1000000000E+01
14 1 0.8907408265E+03 0.1693474458E+00 0.9993943465E+00 0.1000000000E+01
15 1 0.8092417805E+03 0.2258684733E+00 0.9991102575E+00 0.1000000000E+01
16 1 0.7533689822E+03 0.5331827065E-01 0.9997728019E+00 0.1000000000E+01

[James Hocking]

Hi,

The calculation is as follows:

T* = Binv(radiance)
BT = (T* – offset) / slope

where:
Binv is the inverse Planck function
T* is the temperature equivalent of the radiance without band correction
offset, scale are the band correction coefficients from the rtcoef file
BT is the band-corrected brightness temperature

The reference for this is available in the RTTOV docs directory:
docs/sharp_1983_radiance_to_bt_conversion.pdf

We apply the effective temperature method described at the top of page 4.

Best wishes,
James

[Author]

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