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This map layer shows Omernik's Level III ecoregions, derived from a 1:7,500,000 map created by J.M. Omernik in 1987 and from refinements of Omernik's framework that were made for other projects. Ecoregions describe areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources. Omernik's ecoregions are based on the premise that a hierarchy of ecological regions can be identified through the analysis of the patterns and the composition of both living and nonliving phenomena, such as geology, physiography, vegetation, climate, soils, land use, wildlife, and hydrology, that affect or reflect differences in ecosystem quality and integrity. All the characteristics are considered...
This map displays the ecological division by color while delineating ecological provinces, sections and subsections for the conterminous United States. It is indented to provide a reference map of the ecological boundaries. The dataset was issued in 2007 by the USDA Forest Service Washington Office-Ecosystem Management Coordination staff. The data was compiled at 1:500,000 to 1:1,000,000 scales in participation with Federal and State agencies and nongovernmental partners. The polygon descriptions are presented for the delineated 190 section ecological units. Brief descriptions of the section map units provide an abstract primarily of the climate, physiographic, and geologic substrate that combine to form ecosystems...

    map background search result map search result map Omernik's Level III Ecoregions of the Continental United States Forest Service Ecological Regions Regionalizacion ecologica INTA 1982 Regionalizacion ecologica INTA 1982 Forest Service Ecological Regions Omernik's Level III Ecoregions of the Continental United States