This volumne was originally published in 1978 to provide a general description of the ecosystem geography of the Nation as shown on the 1976 map "Ecogregions of the United States." It was first published as an unnumbered publication by the Intermountain Region, USDA Forest Service, Ogden, Utah. It was reprinted in 1980 by the Forest Service, Washington, D.C. as Miscellaneous Publication No. 1391. An explanation of the basis for the regions delineated on the map was presented else where (Baily 1983). The technique of mapping ecoregions was subsequently expanded to include the rest of North America (Bailey and Cushwa 1981) and the world (Bailey 1989). In 1993, as poart the Forest Service's National Hierarchical Framework of Ecological Units (ECOMAP 1993). ecoregions were adopted for use in ecosystem management. They will also be used in the proposed National Interagency Ecoregion Based Ecological Assessments.
The purpose of these ecoregion files is to provide to the user biologicall meaningfull divisions of land that can be used for other analyses. For details, see Bailey's publications.
For References: Bailey, R.G. 1976. Ecoregions of the United States (map). Ogden, Utah: USDA Forest Service, Intermountain Region. Bailey, R.G. 1983. Delineation of Ecosystem Regions. Environmental Management 7: 365-373. Bailey, R.G. 1988 Ecogeographic Analysis: A Guide to the Ecological Division of Land for Resource Management. (Misc. Publ. 1465) Washington, D.C.: USDA Forest Service. 18 p. Bailey, R.G> 1989, Explanatory supplement to ecoregions map of the continents. Environmental Conservation 16: 307-309. Bailey R.G.; Cushwa, C.T. 1981. Ecoregions of North America. (FWS/OBS-81/29.) Washington D.C.: U.S. Fish and WIldlife Service. Bailey, R.G.; Avers, P.E.; King, T.; McNab, W.H., eds. 1994 Ecoregions and subregions of the United States. Washington, D.C.: USDA Forest Service. With supplementary table of map unit descriptions, compiled and edited by W.H. McNab and R.G. Bailey.
publication date
None
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See supplemental information.
See supplemental information.
Data was cut from the National Map and reprojected to Albers
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Internal feature number.
ESRI
Feature geometry.
ESRI
Area of feature in internal units squared.
ESRI
Perimeter of feature in internal units.
ESRI
Internal feature number.
ESRI
User-defined feature number.
ESRI
Mcode + Pcode + Scode
Subcontinental divisions of broad climatic similarity, such as lands that have the dry climates of Koppen(1931), which are affected by latitutde and global atmospheric conditions.
Subdivisions of a domian determined by isolating areas of definite vegetational affinities that fall within the same regional climate. Generally at the level of the basic types of Koppen (1931 as modified by Trewartha 1969).
Subdivisions of a division that correspond to broad vegetation regions., which conform to climatic subzones controlled promarily by continental weather patterns such as length of dry season and duration of cold temperatures.
Broad areas of similar geomorphic process, stratigraphy, geologic origin, drainage networks, topography and regional climate.
Identifies a section as mountainous (M).
Province put into numerical form for simplification.
Section put into numerical form for simplification.
Abbreviation of the section title.
Pcode + Scode
Mcode + Pcode
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Although these data have been processed successfully on a computer system at the U.S. Forest Service, no warranty expressed or implied is made by the USFS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty.
Available via ftp.
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