Converting brightness temperature to actual surface temperature

[newsim]

It is possible to convert brightness temperature of Earth surface (K) to the actual temperature?
Is there any formulae for such conversion?
Thanks in advance!

 

[russ_watters]

I'm not sure "brightness temperature" has any meaning, but you are basically describing an infrared thermometer.

 

[sophiecentaur]

Could this be the sort of thing you are after. Any body that is radiating energy due to its temperature alone will have a spectrum as shown in the diagram.
I think this is used by astronomers to find the temperature of distant sources - optical and 'just warm'.