rad2bt

HIRS2I.rad2bt(rad_wn, wn, c1, c2)

Apply the standard radiance-to-BT conversion from NOAA KLM User’s Guide.

Applies the standard radiance-to-BT conversion as documented by the NOAA KLM User’s Guide. This is based on a linearisation of a radiance-to-BT mapping for the entire channel. A more accurate method is available in typhon.physics.em.SRF.channel_radiance2bt, which requires explicit consideration of the SRF. Such consideration is implicit here. That means that this method is only valid assuming the nominal SRF!

This method relies on values reported in the header of each granule. See NOAA KLM User’s Guide, Table 8.3.1.5.2.1-1., page 8-108. Please convert to SI units first.

NOAA KLM User’s Guide, Section 7.2.

Parameters:

• rad_wn – Spectral radiance per wanenumber [W·sr^{-1}·m^{-2}·{m^{-1}}^{-1}]

• wn – Central wavenumber [m^{-1}]. Note that unprefixed SI units are used.

• c1 – c1 as contained in hrs_h_tempradcnv

• c2 – c2 as contained in hrs_h_tempradcnv