USGS
Water Resources NSDI Node

Aquatic ecoregions of the conterminous United States

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Omernick, J. M.
Publication_Date: 19870101
Publication_Time: Unknown
Title: Aquatic ecoregions of the conterminous United States
Edition: n/a
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Reston, Virginia, USA
Publisher: U.S. Geological Survey
Online_Linkage: <http://water.usgs.gov/lookup/getspatial?ecoregion>
Description:
Abstract:
Ecoregions are based on perceived patterns of a combination of causal and integrative factors including land use, land surface form, potential natural vegetation, and soils (Omernik, 1987). This is a copy of the ecoregion coverage of Omernik (1987) with some item names modified.
Purpose:
This coverage is intended for national-level studies of water resources.
Supplemental_Information:
Reviews_Applied_to_Data. The ecoregions were plotted on a terminal to ensure the EXPORT file was imported properly. No claims are made regarding the accuracy of the original data or linework.

Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19911217
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned.
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -127.87111726
East_Bounding_Coordinate: -65.35687433
North_Bounding_Coordinate: 48.24430721
South_Bounding_Coordinate: 22.87753347
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: EPA Ecoregion Map
Theme_Keyword: Conterminous United States
Access_Constraints: None
Use_Constraints: None
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: 12201 Sunrise Valley Drive, MS 440
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: 1-800-426-9000
Contact_Electronic_Mail_Address: h2oteam@usgs.gov
Contact_Instructions: Please use email.
Native_Data_Set_Environment: dgux, 5.4R3.10, AViiON UNIX, ARC/INFO version 7.0.4
Data_Quality_Information:
Logical_Consistency_Report: See supplemental information.
Completeness_Report: See supplemental information.
Lineage:
Process_Step:
Process_Description:
The coverage was installed from an ARC/INFO EXPORT file supplied by EPA Corvallis. Some item names were modified and others were redefined to make the coverage more convenient to use and to conform to more conventional item names.
Process_Date: 19910928
Process_Step:
Process_Description:
Rev. 1.1 Converted to Data General workstation. Item redefinitions revised and documentation added.
Process_Date: 19911217
Source_Information:
Source_Citation:
Citation_Information:
Originator: Omernik, J. M
Publication_Date: 1987
Title: Aquatic ecoregions of the conterminous United States
Publication_Information:
Publication_Place: unknown
Publisher: Association of American Geographers
Series_Information:
Series_Name: Annals of the Association of American Geographers
Issue_Identification: 77:118-125
Source_Scale_Denominator: 7500000
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 3732
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 8064
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 3733
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Albers_Conical_Equal_Area:
Standard_Parallel: 29.5
Standard_Parallel: 45.5
Longitude_of_Central_Meridian: -96
Latitude_of_Projection_Origin: 23
False_Easting: 0.0
False_Northing: 0.0
Map_Projection_Name: Albers Conical Equal Area
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 1.0
Ordinate_Resolution: 1.0
Planar_Distance_Units: meters
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: ECOREGION.PAT
Entity_Type_Definition: Polygon attribute table
Entity_Type_Definition_Source: Omernik (1987)
Attribute:
Attribute_Label: AREA
Attribute_Definition: Area of polygon in square coverage units
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Positive real numbers
Enumerated_Domain_Value_Definition: n/a
Enumerated_Domain_Value_Definition_Source: n/a
Attribute:
Attribute_Label: PERIMETER
Attribute_Definition: Perimeter of polygon in coverage units
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Positive real numbers
Enumerated_Domain_Value_Definition: n/a
Enumerated_Domain_Value_Definition_Source: n/a
Attribute:
Attribute_Label: ECOREGION#
Attribute_Definition: Internal feature number
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition: n/a
Enumerated_Domain_Value_Definition_Source: n/a
Attribute:
Attribute_Label: ECOREGION-ID
Attribute_Definition: User-assigned feature number
Attribute_Definition_Source: User-defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Integer
Enumerated_Domain_Value_Definition: n/a
Enumerated_Domain_Value_Definition_Source: n/a
Attribute:
Attribute_Label: ECO
Attribute_Definition: Full ecoregion code
Attribute_Definition_Source: Omernik (1987)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: positive numbers are ecoregions
Enumerated_Domain_Value_Definition: n/a
Enumerated_Domain_Value_Definition_Source: n/a
Attribute:
Attribute_Label: PBMIN1
Attribute_Definition: State code item used by EPA
Attribute_Definition_Source: Omernik (1987)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: (FIPS)
Enumerated_Domain_Value_Definition: n/a
Enumerated_Domain_Value_Definition_Source: n/a
Attribute:
Attribute_Label: LWCODE
Attribute_Definition: Land/water code.
Attribute_Definition_Source: Omernik (1987)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: L=land, W=water, ZZ=missing
Enumerated_Domain_Value_Definition: n/a
Enumerated_Domain_Value_Definition_Source: n/a
Attribute:
Attribute_Label: COLOR
Attribute_Definition: Working item for plotting
Attribute_Definition_Source: Local
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: numeric
Enumerated_Domain_Value_Definition: n/a
Enumerated_Domain_Value_Definition_Source: n/a
Attribute:
Attribute_Label: ECOREGION
Attribute_Definition: Ecoregion code
Attribute_Definition_Source: Omernik (1987)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1-76, -1=none
Enumerated_Domain_Value_Definition: n/a
Enumerated_Domain_Value_Definition_Source: n/a
Attribute:
Attribute_Label: TYPICAL
Attribute_Definition: Indicates strength of association in ecoregion
Attribute_Definition_Source: Omernik (1987)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0=most typical, 1=generally typical
Enumerated_Domain_Value_Definition: n/a
Enumerated_Domain_Value_Definition_Source: n/a
Attribute:
Attribute_Label: FIPSST
Attribute_Definition: State code
Attribute_Definition_Source: Omernik (1987)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: (FIPS)
Enumerated_Domain_Value_Definition: n/a
Enumerated_Domain_Value_Definition_Source: n/a
Overview_Description:
Entity_and_Attribute_Overview:
Ecoregions are based on perceived patterns of a combination of causal and integrative factors including land use, land surface form, potential natural vegetation, and soils (Omernik, 1987). There are 76 ecoregions, identified by the item ECOREGION.

The item TYPICAL allows a fuzzy logic whereby polygons identified with TYPICAL = 0 are "most typical" of the ecoregion they represent. Those identified by TYPICAL = 1 are "generally typical" any may not have all the characteristics.

The ecoregion coverage is superimposed upon a coverage of states. The state lines may divide polygons.

Entity_and_Attribute_Detail_Citation: See overview.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: Mailing address
Address: 12201 Sunrise Valley Drive, MS 440
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: 1-800-426-9000
Contact_Electronic_Mail_Address: h2oteam@usgs.gov
Contact_Instructions: Please use email.
Distribution_Liability: None.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE and SDTS
Ordering_Instructions: Available via ftp.
Fees: None
Metadata_Reference_Information:
Metadata_Date: 19970925
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: 12201 Sunrise Valley Drive, MS 440
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: 1-800-426-9000
Contact_Electronic_Mail_Address: h2oteam@usgs.gov
Contact_Instructions: Please use email.
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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U.S. Department of the Interior, U.S. Geological Survey
Maintainer: Water Webserver Team