Omernik's Level III Ecoregions of the Continental United States, 2003

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Abstract/Contents

Abstract
This polygon shapefile 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 when determining ecoregions, but the relative importance of each characteristic may vary from one ecoregion to another. Level III is the most detailed level available nationally for this system of ecoregions. This layer is part of the 1997-2014 edition of the National Atlas of the United States.
Purpose
These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:7,500,000-scale data. No responsibility is assumed by the National Atlas of the United States in the use of these data.

Description

Type of resource cartographic, software, multimedia
Form Shapefile
Extent 13.446
Place Reston, Va, US
Publisher National Atlas of the United States
Publication date 2005
Language English
Digital origin born digital
Map data 1:7500000Scale not given. ; EPSG::4269 W 179°8ʹ--E 179°47ʹ18ʺ/N 71°23ʹ53ʺ--N 24°31ʹ6ʺ, Scale not given ; EPSG::4326

Creators/Contributors

Creator United States. Environmental Protection Agency

Subjects

Subject Ecological regions
Subject Biotic communities
Subject United States
Subject Alaska
Subject Alabama
Subject Arizona
Subject Arkansas
Subject Colorado
Subject Connecticut
Subject Delaware
Subject Florida
Subject Georgia
Subject Hawaii
Subject Idaho
Subject Illinois
Subject Indiana
Subject Iowa
Subject Kansas
Subject Kentucky
Subject Louisiana
Subject Maine
Subject Maryland
Subject Massachusetts
Subject Michigan
Subject Minnesota
Subject Mississippi
Subject Missouri
Subject Montana
Subject Nebraska
Subject Nevada
Subject New Hampshire
Subject New Jersey
Subject New Mexico
Subject New York (State)
Subject North Carolina
Subject North Dakota
Subject Ohio
Subject Oklahoma
Subject Oregon
Subject Pennsylvania
Subject Rhode Island
Subject South Carolina
Subject South Dakota
Subject Tennessee
Subject Texas
Subject Utah
Subject Vermont
Subject Virginia
Subject Washington (D.C.)
Subject Washington (State)
Subject West Virginia
Subject Wisconsin
Subject Wyoming
Subject 2003
Subject Environment
Subject Biology and Ecology
Genre Geospatial data
Genre Cartographic dataset

Bibliographic information

Use limitation None. Acknowledgment of the U.S. Environmental Protection Agency and (or) the National Atlas of the United States of America would be appreciated in products derived from these data.
WGS84 Cartographics This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
Location https://purl.stanford.edu/yk007jj4941

Access conditions

Use and reproduction
This item is in the public domain. There are no restrictions on use.
Copyright
This work is in the Public Domain, meaning that it is not subject to copyright.

Preferred citation

U.S. Environmental Protection Agency. (2005). Omernik's Level III Ecoregions of the Continental United States, 2003. National Atlas of the United States. Available at: http://purl.stanford.edu/yk007jj4941.

Collection

National atlas of the United States of America, 1997-2014

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