Each key can appear several times in a BUFR message.
Examples are:
- airTemperature in an upper air report
- backscatter in a scatterometer observation
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')