Critical habitats are areas considered critical to the survival of a particular species, as determined by USFWS. Ecoregions are areas of similar biota and climate, as determined by the EPA. This map was created by calculating the percent of each ecoregion that is considered critical habitat, regardless of species.
The Critical Habitat by Ecoregion map was derived by calculating the percentage of each Ecoregion that is occupied by pixels representing Critical Habitat (of any species). The
Critical habitats are areas considered critical to the survival of a particular species, as determined by USFWS. Ecoregions are areas of similar biota and climate, as determined by the EPA. This map was created by calculating the percent of each ecoregion that is considered critical habitat, regardless of species.
The Critical Habitat by Ecoregion map was derived by calculating the percentage of each Ecoregion that is occupied by pixels representing Critical Habitat (of any species). The Critical Habitat layer originally consisted of two shapefiles, polygons and lines. These were “rasterized” and then combined in order to be able to calculate zonal statistics using Spatial Analyst. Rasterization was at 1km, for a national-level map.
