How do I detect keys whose values are missing in a BUFR message? - ecCodes GRIB FAQ

How do I detect keys whose values are missing in a BUFR message?

Step-by-step guide

Each element in the data section of a BUFR can be missing.  ecCodes provides a simple way for the user to check if the value of an element is missing by comparing with two constants:

  CODES_MISSING_LONG
  CODES_MISSING_DOUBLE

1. These constants are available in Python, Fortran 90 and C and the user needs to compare with the appropriate constant depending on the type of the variable used. This is an example of Fortran 90 code:

   !declare backscatter as double precision
   real(kind=8), dimension(:), allocatable :: backscatter
    
   !get the values
   call codes_get(ibufr,'/beamIdentifier=2/backscatter',backscatter);
   do i=1,size(backscatter)
       !compare with double precision missing
       if (backscatter(i)/=CODES_MISSING_DOUBLE) then
           !process non missing values
       else
           !process missing values
       endif
   end do

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