Field data for the Vegetation Mapping Inventory Project of Johnstown Flood National Memorial

This reference is an assemblage of field data collected as part the baseline vegetation inventory for the park unit. Typical files here are vegetation plot data, accuracy assessment data, field photos, PDF showing locations of vegetation plots and accuracy assessment data, and other data for this type. All vegetation plot sampling followed the USGS/NPS Vegetation Mapping Program protocols (The Nature Conservancy and Environmental Systems Research Institute 1994b). The protocol suggests that each vegetation association should be sampled at least three times in order to capture the naturally occurring variation within the park. If each of the formation-level vegetation types listed in Table 2 represented only one association in Johnstown Flood National Memorial, the minimum number of plots needed would have been 20. This assumed that areas labeled with modified Anderson level II categories would not be sampled, and that for formations with less than three polygons, one plot would be placed in each polygon. However, due to the small size of the park and the intensive level of vegetation management, fewer plots were needed to accurately characterize the park’s vegetation. Based on our initial reconnaissance of Johnstown Flood National Memorial and previous vegetation mapping efforts at this and other parks, we concluded that 15 plots would be sufficient to capture the range of vegetation types.

Field data for the Vegetation Mapping Inventory Project of Johnstown Flood National Memorial

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