0 0 SKY CLEAR
1 1 FEW
2 2 SCATTERED
3 3 BROKEN
4 4 OVERCAST
5 5 RESERVED
6 6 SCATTERED/BROKEN
7 7 BROKEN/OVERCAST
8 8 ISOLATED
9 9 ISOLATED EMBEDDED
10 10 OCCASIONAL
11 11 OCCASIONAL EMBEDDED
12 12 FREQUENT
13 13 DENSE
14 14 LAYERS
15 15 OBSCURED (OBSC)
16 16 EMBEDDED (EMBD)
17 17 FREQUENT EMBEDDED
31 31 MISSING VALUE
