From XMS Wiki - http://wikis.aquaveo.com/xms/
USGS Land Use and Land Cover Classification System
(see http://landcover.usgs.gov/pdf/anderson.pdf)
1 Urban or Built-up Land
11 Residential
12 Commercial and Services
13 Industrial
14 Transportation, Communications, and Utilities
15 Industrial and Commercial Complexes
16 Mixed Urban or Built-up Land
17 Other Urban or Built-up Land
2 Agricultural Land
21 Cropland and Pasture
22 Orchards, Groves, Vineyards, Nurseries, and Ornamental Horticultural Areas
23 Confined Feeding Operations
24 Other Agricultural Land
3 Rangeland
31 Herbaceous Rangeland
32 Shrub and Brush Rangeland
33 Mixed Rangeland
4 Forest Land
41 Deciduous Forest Land
42 Evergreen Forest Land
43 Mixed Forest Land
5 Water
51 Streams and Canals
52 Lakes
53 Reservoirs
54 Bays and Estuaries
6 Wetland
61 Forested Wetland
62 Nonforested Wetland
7 Barren Land
71 Dry Salt Flats.
72 Beaches
73 Sandy Areas other than Beaches
74 Bare Exposed Rock
75 Strip Mines Quarries, and Gravel Pits
76 Transitional Areas
77 Mixed Barren Land
8 Tundra
81 Shrub and Brush Tundra
82 Herbaceous Tundra
83 Bare Ground Tundra
84 Wet Tundra
85 Mixed Tundra
9 Perennial Snow or Ice
91 Perennial Snowfields
92 Glaciers
