Access keys by rank:

Step-by-step guide

Add the steps involved:

1. Each key can appear several times in a BUFR message. 

2. Examples are: 

   1. airTemperature in an upper air report
   2. backscatter in a scatterometer observation

3. ecCodes provides access by rank of all the keys in the data section of a BUFR message with the following syntax:

   
   

   #to get the third airTemperature in the message t=codes_get(bufr,'#3#airTemperature')

   
   

   #to get the second backscatter in the message b=codes_get_array(bufr,'#2#backscatter')

   
   

4. This is a change compared with the key syntax provided before version 0.12.0 where the access by rank was expressed as 'airTemperature#3'

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