Water Resources NSDI Node

Aquatic ecoregions of the conterminous United States

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

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

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