Name: BLM National GRSG Existing Sagebrush 2014 Update
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Description: Developed to support the Greater Sage-Grouse (GRSG) Monitoring Framework, the Bureau of Land Management (BLM) Existing Sagebrush 2014 update data layer is a binary raster principally comprised of pixels representing 18 ecological systems which were determined to have the capability of supporting sagebrush vegetation while also providing suitable seasonal habitat for GRSG. Sagebrush vegetation was defined as sagebrush species or subspecies that provide habitat for GRSG and are also included in the Sage-Grouse Habitat Assessment Framework (Stiver et al. 2014). The resultant data layer was derived from the U.S. Geological Survey (USGS) LANDFIRE Version 1.2 Existing Vegetation Type (EVT) thematic raster data product (http://www.landfire.gov). EVT is composed of vegetation map units based upon NatureServe’s terrestrial ecological systems classification, which is a nationally consistent set of mid-scale ecological units (Comer et al., 2003). LANDFIRE maps EVTs using decision tree models, field reference data, Landsat imagery, digital elevation model (DEM) data, and biophysical gradient data. After recoding the original LANDFIRE EVT product to a preliminary existing sagebrush binary raster, additional habitat (i.e., sagebrush vegetation pixels) was subsequently removed to account for selective anthropogenic and ecological disturbances (e.g., agricultural expansion, urbanization, wildfire, and conifer encroachment). A description of each habitat removal mask is provided in the Data Quality section of this metadata record.
These data are provided by Bureau of Land Management (BLM) “as is” and might contain errors or omissions. The User assumes the entire risk associated with its use of these data and bears all responsibility in determining whether these data are fit for the User’s intended use. The information contained in these data is dynamic and may change over time. The data are not better than the sources from which they were derived, and both scale and accuracy may vary across the data set. These data might not have the accuracy, resolution, completeness, timeliness, or other characteristics appropriate for applications that potential users of the data may contemplate. The User is encouraged to carefully consider the content of the metadata file associated with these data. These data are neither legal documents nor land surveys, and must not be used as such. Official records may be referenced at most BLM offices. Please report any errors in the data to the BLM office from which it was obtained. The BLM should be cited as the data source in any products derived from these data. Any Users wishing to modify the data should describe the types of modifications they have performed. The User should not misrepresent the data, nor imply that changes made were approved or endorsed by BLM. This data may be updated by the BLM without notification.
Copyright Text: Processed by the Bureau of Land Management (BLM), National Operations Center (NOC), OC-534.
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