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Vegetation and land cover of Blue Ridge National Wildlife Refuge, circa 2011. This dataset is based on interpretation of aerial imagery from the National Agricultural Imagery Program from 2010. Image classification was performed using eCognition software, which creates homogeneous polygons from the imagery. Image statistics such as texture, NDVI and spectral values were then calculated for each polygon used to classify the imagery. Field data was collected in August, 2011 to assist in the image interpretation. No additional field data were collected for validation, and no validation or accuracy assessment was completed for this dataset. Therefore, no estimates of accuracy are given.
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This map is based on interpretation of aerial imagery as well as field data collected by USFWS Refuge Planning staff and botanist Pam Devries. Detailed plant surveys were conducted throughout the growing seasons of 2009 and 2010 to determine the distribution of vegetation classes throughout the NWR. Mapping was done to the Group/Macrogroup level of the National Vegetation Classification System in most cases, with some classes mapped to the Alliance level, especially for isolated stands that were clearly identifiable. Class assignments were based on descriptions from A Manual of California Vegetation, Second Edition (Sawyer et al. 2008). Two dates (2009 and 2010) of near-infrared orthoimagery from the National Agricultural...


    map background search result map search result map Vegetation and Land Cover, Bitter Creek National Wildlife Refuge Vegetation and Land Cover, Blue Ridge National Wildlife Refuge Vegetation and Land Cover, Blue Ridge National Wildlife Refuge Vegetation and Land Cover, Bitter Creek National Wildlife Refuge