0 0 NO WIND SPEED DATA AVAILABLE
1 1 AMSR-E DATA
2 2 TMI DATA
3 3 NWP: ECMWF
4 4 NWP: UK MET OFFICE
5 5 NWP: NCEP
6 6 REFERENCE CLIMATOLOGY
7 7 ERS_SCATTEROMETER
31 31 MISSING VALUE