Colorado Ecoregions/Subregions
18 Wyoming Basin
18-1  Semiarid to Arid Shrublands
20 Colorado Plateaus
20-1 Desert Shrublands
20-2 Saltdeserts
20-3 Wooded Uplands
21 Southern Rockies
21-1 High Elevation Tundra
21-2 Cool and Moist Forests of the Middle to High Elevations
21-3 Warm and Dry Forests of the Middle to Low Elevations
21-4 Low to Middle Elevation Semi-desert Shrublands
22 Arizona/New Mexico Plateau
22-1 Shrublands
22-2 Irrigated Flatlands
22-3 Saltdeserts
25 Western High Plains
25-1 Rolling Sand Plains
25-2 Moderate Relief Rangeland
25-3 Flat to Rolling Cropland
26 Southwestern Tablelands
26-1 Grasslands
coverages are in utm projection
parameters are:
projection utm
zone 13
units meters
yshift -4000000