Data Releases

Environments dominated by human disturbance such as roads, cities, and the constructed materials that support human habitation have profound effects on species. For most species, this data layer was used to exclude species from a portion of the landscape. However, some species respond favorably to human habitats, therefore this data layer was used in an inclusionary manner. The human impact avoida

Water and its location on the landscape are important aspects of a species distribution. A number of water related data layers were used to refine these USGS Gap Analysis Project species models. These include water type (i.e. flowing, open/standing), distance to and from water, and stream flow and underlying gradient. The source for this data was the USGS National Hydrography Dataset (NHD)(USGS 20

The Hydrologic Unit Code (HUC) is part of a hierarchical classification system for surface water drainage in the US (Seaber et al. 1987). The numerical code represents a cataloging unit of delineation. Vector format (i.e. polygon) data were compiled from United States Geological Survey (USGS) source - the Watershed Boundary Dataset (WBD). In order to include areas of large water bodies and ocean s

The Land Cover Data - Version 1.0 represents a highly thematically detailed land cover map of the U.S. The map legend includes types described by NatureServe's Ecological Systems Classification (Comer et al. 2002) as well as land use classes described in the National Land Cover Dataset 2001 (Homer et al. 2007). This version of the land cover data was used to support the USGS Gap Analysis Project's

The slope dataset was derived from the National Elevation Dataset and resulted in a slope dataset that is of the same resolution as the 30 m land cover dataset. Slope was reported in degrees. Slope is defined as the ratio of the rise divided by the run between two points on a line, expressed in degrees. Slope was generated using ArcGIS Spatial Analyst, with the USGS National Elevation Dataset as i

This dataset represents a species habitat distribution model for Utah Prairie Dog. These habitat maps are created by applying a deductive habitat model to remotely-sensed data layers within a species' range.

This dataset represents a species known range extent for Cynomys parvidens (Utah Prairie Dog). These range maps are created by attributing sub-watershed polygons with information of a species presence, origin, seasonal and reproductive use.

This dataset represents a species habitat distribution model for Vagrant Shrew. These habitat maps are created by applying a deductive habitat model to remotely-sensed data layers within a species' range.

This dataset represents a species known range extent for Sorex vagrans (Vagrant Shrew). These range maps are created by attributing sub-watershed polygons with information of a species presence, origin, seasonal and reproductive use.

This dataset represents a species habitat distribution model for Valdina Farms Salamander. These habitat maps are created by applying a deductive habitat model to remotely-sensed data layers within a species' range.

This dataset represents a species known range extent for Eurycea troglodytes (Valdina Farms Salamander). These range maps are created by attributing sub-watershed polygons with information of a species presence, origin, seasonal and reproductive use.

This dataset represents a species habitat distribution model for Valley And Ridge Salamander. These habitat maps are created by applying a deductive habitat model to remotely-sensed data layers within a species' range.