The files linked to this reference are the geospatial data created as part of the completion of the baseline vegetation inventory project for the NPS park unit. Current format is ArcGIS file geodatabase but older formats may exist as shapefiles.

A total of 1,287.9 acres (521.3 hectares) are within the sampled boundaries of HOCU. The standard minimum mapping unit for NPS vegetation inventory projects is defined as 0.5 hectare, although several mapped polygons were smaller for HOCU. Ruderal grasslands within the Orchardgrass-Timothy-Fescue species-Goldenrod species Herbaceous Vegetation type dominated the landscape of HOCU, comprising 587.8 acres (237.9 hectares), or 70.3% of the non-developed area. Ruderal woodland made up 135.8 acres (55.1 hectares), or an additional 16.2% of the undeveloped area. Restored tallgrass prairie and eastern North American Wet Meadow each made up less than 1% of the area, and the remaining types made up about 4% each. The Appalachian Sugar Maple-Chinkapin Oak Limestone Forest appeared most natural of all types mapped, and occupied 34.1 acres (13.8 hectares) in two patches separated by a narrow, open right of way. Developed land accounted for 441.5 acres (178.7 hectares), or 34.2% of the park. A total of 142 polygons were mapped, with an average area of 9.1 acres (3.68 hectares).