Table 1.

National Land Cover Database (NLCD) land cover legend for Level II of the classification hierarchy and (class codes). Level I classes are based on the tens digit of the class code, e.g., classes 11 and 12 combine to form class = 10 (water). See http://www.mrlc.gov/nlcd11_leg.php for a complete description of NLCD classes.

Class (code)	Description
Water (11)	Open water, with generally < 25% vegetation or soil cover
Perennial ice/snow (12)	> 25% permanent ice or snow
Developed, open space (21)	Dominated by vegetation; impervious cover (IC) ≤ 20%
Developed, low intensity (22)	Mixture of vegetation and IC (20% < IC ≤ 49%)
Developed, medium intensity (23)	Mixture of vegetation and IC (50% < IC ≤ 79%)
Developed, high intensity (24)	Mixture of vegetation and IC (IC ≥ 80%)
Barren (31)	Bedrock, desert pavement, etc.; vegetation < 15 cover
Deciduous forest (41)	Trees > 20% cover of which > 75% shed foliage seasonally
Evergreen forest (42)	Trees > 20% cover of which > 75% maintain foliage year round
Mixed forest (43)	Trees > 20% cover; neither deciduous or evergreen > 75% cover
Shrubland (52)	Woody species < 5 m and > 20% cover
Grassland (71)	Herbaceous cover ≥ 80%; no management (e.g., tilling) evident
Pasture (81)	Herbaceous cover > 20% for livestock, seed, or hay crops
Cultivated crops (82)	Herbaceous or woody cover ≥ 20% (e.g., corn, orchards)
Woody wetlands (90)	Woody cover > 20% on periodically saturated soil
Herbaceous wetland (95)	Herbaceous cover > 80% on periodically saturated soil