Metop-B AVHRR calibration parameters file

Metop-B AVHRR calibration parameters file

Postby nigel.atkinson » Fri Feb 08, 2013 1:44 pm

An error has been discovered in the Metop-B section of the AVHRR calibration parameters file, AAPP/src/calibration/libavhrcl/avhcal.txt. This results in incorrect radiance calibration for channels 4 and 5. Lines 1317-1318 should be changed from
Code: Select all
    Coefficient C:   0.0000000      4.85           4.36   
Space Radiance RSP:  0.0000        -4.75          -4.39

to

Code: Select all
    Coefficient C:   0.0000000      4.85           4.36   
Space Radiance RSP:  0.0000         -4.75          -4.39

i.e. insert an extra space before the minus sign in the second line. This is because the information is read in using a formatted read.

From the directory containing the changed file, the command "make dat" will install it to the data directory (../../../data/calibration/coef/avhcl). If you are using a seperate installation directory ($AAPP_PREFIX), copy the file also to directory $AAPP_PREFIX/AAPP/data/calibration/coef/avhcl.

The correction will be included in the next update release of AAPP.

Regards,

Nigel
nigel.atkinson
 
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