Coalescent low-center polygons
aquatic
Low-center polygons
wet
Nonpatterned Drained Thaw Lake Basins 
Drained slope
dry
Flat-center polygons
moist
High-center polygons 
Sandy barrens
other
Sand dunes
Ice
Coastal saline waters
water
Rivers
Urban (i.e. towns and roads)
Riparian corridors
Ponds
Small lakes
Medium lakes
Large lakes