Solar radiation enters the Earth's atmosphere with a portion being scattered by clouds and aerosols.

Processing, archiving and distributing Earth science data
at the NASA Langley Research Center

How is the ERBE region number determined?

The ERBE region number can be easily determined with the following:

2.5-degree Data: Region number = int(colat / 2.5) * 144 + (lon / 2.5)

5-degree Data: Region number = int(colat / 5) * 72 + (lon / 5)

10-degree Data: Region number = int(colat / 10) * 36 + (lon / 10)

where colat = 90 - latitude