Geospatial data for the Vegetation Mapping Inventory Project of John Muir National Historic Site

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. Vegetation communities were delineated for the Mt. Wanda sub-unit of the John Muir National Historic Site in the summer of 2004. A total of 13 alliances and 18 associations were identified in the study area. These 13 alliances represent 7 formation types and 4 classes: forest, woodland, shrubland and herbaceous vegetation. The plot locations encompass every vegetation type and include every aspect and elevation of Mt. Wanda. Included in the report are an alliance level map and a class level map using the black and white aerial photograph of 2000. There are eight polygons that were classified to the alliance level and were visited, but do not have an association assignment because a rapid assessment plot was not done within the polygon. There are two polygons called “facilities” which have some vegetation cover but consist mostly of buildings or horse corrals. In future mapping efforts, these polygons should be included in vegetation analysis since they may have structures removed and/or restoration projects associated with them. The horse corrals are particularly important for management of invasive species since some are a source for specific invasive species not found in other locations on Mt. Wanda, such as purple starthistle (Centaurea calcitrapa) and perennial pepperweed (Lepidium latifolium) (Bossard et al. 2000).

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