Table 2. Categories included in original USGS-NPS coverage and comparison to three methods of interpretation.

Category USGS-NPS Coverage (ha)Cluster Selection (ha)GIS Summary I (ha)GIS Summary II (ha)
Purple-3-awn ­ Fetid Marigold Herbaceous Vegetation861.05382.32307.8320.76
Ponderosa Pine Limestone Cliff Sparse Vegetation129.77N/AN/AN/A
Redbeds Sparse Vegetation68.5342.12N/A6.48
Black Hills Rock Outcrop Sparse Vegetation1,394.62N/AN/AN/A
Shale Barren Slope Sparse Vegetation370.87359.6429.2632.4
White Sedimentary Rock Outcrop Sparse Vegetation269.59N/A22.6822.68
Bison Wallows1,24.35N/AN/AN/A
Burned Pine776.89942.84239.76317.52
Emergent Wetland Herbaceous Complex154.35N/AN/AN/A
Little Bluestem ­ Grama Grass / Threadleaf Sedge Herbaceous Vegetation4259.703304.81150.21140.48
Western Wheatgrass ­ Kentucky Bluegrass Complex10746.3613011.8417933.417677.44
Introduced Weedy Graminoid1,339.80N/AN/AN/A
Needle-and-thread ­ Blue Grama / Threadleaf Sedge Herbaceous Vegetation286.33243.0N/AN/A
Mountain Mahogany ­ Sideoats Grama I578.48197.6451.84129.6
Mountain Mahogany ­ Sideoats Grama II1,3187.97N/AN/AN/A
Lead Plant162.67155.52N/AN/A
Chokecherry Shrubland700.93165.24N/AN/A
Beaked Willow Shrubland1,37.77N/AN/AN/A
Western Snowberry Shrubland757.72758.16N/AN/A
Creeping Juniper ­ Little Bluestem Shrubland1,20.11N/AN/AN/A
Plains Cottonwood ­ Western Snowberry Forest352.7242.12N/AN/A
Boxelder/Chokecherry Forest1149.64N/AN/AN/A
Bur Oak Stand1,314.41N/AN/AN/A
Green Ash ­ American Elm / Western Snowberry Forest311.5893.96N/AN/A
Birch ­ Aspen Stand1,344.50N/AN/AN/A
Ponderosa Pine Woodland Complex I2713.995495.046207.846207.84
Ponderosa Pine ­ Little Bluestem Woodland4224.281707.485469.125469.12
Ponderosa Pine ­ Chokecherry Forest1001.03N/A3.243.24
Ponderosa Pine Woodland Complex II4506.535585.762993.762993.76
Young Ponderosa Pine Dense Cover1995.48N/AN/AN/A
Transportation, Communications, and Utilities331.31N/A100.4487.48
Crop and Pasture1744.391574.641244.161302.48
Other Agricultural Lands112.06155.52N/A32.4
Open Water28.1816.216.219.44
Strip Mines and Gravel Pits41.49N/A19.446.48