Ch
Cont. (>90%) permafrost: High (>20%) ground ice
Cl
Cont. (>90%) permafrost: Low (<10%) ground ice
Cm
Cont. (>90%) permafrost: Med (10-20%) ground ice
Cmh
Cont. (>90%) permafrost: Med-High (>10%) ground ice
Cml
Cont. (>90%) permafrost: Med-Low (<20%) ground ice
El
Ext. discont. (50-90%) permafrost: Low(<10%) ground ice
Elm
Ext. discont. (50-90%) perma: Med-Low (<20%) ground ice
Em
Ext. discont. (50-90%) perma: Med (10-20%) ground ice
Enl
Ext. discont. (50-90%) perma: Low-Nil(0-10%) ground ice
Il
Isol. patches (0-10%) perma: Low (<10%) ground ice
Ilm
Isol. patches (0-10%) perma: Low-Med (<20%) ground ice
In
Isol. patches (0-10%) perma: Nil (0%) ground ice
Inl
Isol. patches (0-10%) perma: Low-Nil (0-10%) ground ice
N
No permafrost
Sl
Spor. discont. (10-50%) perma: Low (<10%) ground ice
Slm
Spor. discont. (10-50%) perma: Low-Med (<20%) ground ic
Snl
Spor. discont.(10-50%) perma: Low-Nil(0-10%) ground ice