NDHUB.Ecoregions_Omernik

SDE Feature Class

Tags
Biology, Land, Selected State, Conterminous United States, Ecosystem, location, environment, United States, US Ecoregion Levels III and IV, North American (CEC) Ecoregion Levels I, II, III, North Dakota, Natural Resources, Conservation, biota, Ecology, boundaries, Environment

Description

Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources. They are designed to serve as a spatial framework for the research, assessment, management, and monitoring of ecosystems and ecosystem components. These general purpose regions are critical for structuring and implementing ecosystem management strategies across federal agencies, state agencies, and nongovernment organizations that are responsible for different types of resources within the same geographical areas. The approach used to compile this map is based on the premise that ecological regions can be identified through the analysis of patterns of biotic and abiotic phenomena, including geology, physiography, vegetation, climate, soils, land use, wildlife, and hydrology. The relative importance of each characteristic varies from one ecological region to another. A Roman numeral hierarchical scheme has been adopted for different levels for ecological regions. Level I is the coarsest level, dividing North America into 15 ecological regions. Level II divides the continent into 52 regions (Commission for Environmental Cooperation Working Group, 1997). At Level III, the continental United States contains 104 regions whereas the conterminous United States has 84 (U.S. Environmental Protection Agency, 2005). Level IV ecoregions are further subdivisions of Level III ecoregions. Methods used to define the ecoregions are explained in Omernik (1995, 2004), Omernik and others (2000), and Gallant and others (1989). Literature cited: Commission for Environmental Cooperation Working Group, 1997, Ecological regions of North America- toward a common perspective: Montreal, Commission for Environmental Cooperation, 71 p. Gallant, A. L., Whittier, T.R., Larsen, D.P., Omernik, J.M., and Hughes, R.M., 1989, Regionalization as a tool for managing environmental resources: Corvallis, Oregon, U.S. Environmental Protection Agency, EPA6003-89060, 152p. Omernik, J.M., 1995, Ecoregions - a framework for environmental management, in Davis, W.S. and Simon, T.P., eds., Biological assessment and criteria-tools for water resource planning and decision making: Boca Raton, Florida, Lewis Publishers, p.49-62. Omernik, J.M., Chapman, S.S., Lillie, R.A., and Dumke, R.T., 2000, Ecoregions of Wisconsin: Transactions of the Wisconsin Academy of Science, Arts, and Letters, v. 88, p. 77-103. Omernik, J.M., 2004, Perspectives on the nature and definitions of ecological regions: Environmental Management, v. 34, Supplement 1, p. s27-s38. Comments and questions regarding Ecoregions should be addressed to Glenn Griffith, Dynamac Corporation, co US EPA., 200 SW 35th Street, Corvallis, OR 97333, (541)-754-4465, email:griffith.glenn@epa.gov Alternate: James Omernik, USGS, co US EPA, 200 SW 35th Street, Corvallis, OR 97333, (541)-754-4458, email:omernik.james@epa.gov


Summary

Ecoregion maps assist managers of aquatic and terrestrial resources to understand the regional patterns of the realistically attainable quality of these resources

Credits

Use limitations

The State of North Dakota has compiled this data according to conventional cartographic standards, using what is thought to be the most reliable information available.  This data is intended to make results of research available at the earliest possible date, but is not intended to constitute final or formal publication.  The State of North Dakota makes every effort to provide virus-free files but does not guarantee uncorrupted files.  The State of North Dakota does not guarantee this data to be free from errors, inaccuracies, or viruses, and disclaims any responsibility or liability for interpretations or decisions based on this data.

Scale Range

Metadata 

Topics and Keywords 

Themes or categories of the resource  location, environment, biota, boundaries


*Content type  Downloadable Data


Place keywords  United States, North Dakota

Place keywords  Selected State, Conterminous United States

Theme keywords  location, environment, biota, boundaries

Thesaurus
Title ISO 19115 Topic Category




Theme keywords  US Ecoregion Levels III and IV, North American (CEC) Ecoregion Levels I, II, III

Thesaurus
Title User




Theme keywords  Biology, Land, Ecosystem, Natural Resources, Conservation, Ecology, Environment

Thesaurus
Title EPA GIS Keyword Thesaurus




Citation 

*Title NDHUB.Ecoregions_Omernik
Publication date 2010-05-01


Presentation formats  digital map
FGDC geospatial presentation format  vector digital data


Citation Contacts 

Responsible party
Organization's name US Environmental Protection Agency
Contact's role  originator


Responsible party
Organization's name U.S. EPA Office of Research & Development (ORD) - National Health and Environmental Effects Research Laboratory (NHEERL)
Contact's role  publisher


Contact information
Address
Delivery point Corvallis, OR



Resource Details 

Dataset languages  English (UNITED STATES)


Spatial representation type  vector


Supplemental information
*Processing environment Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.1.4959


*Name NDHUB.Ecoregions_Omernik
*Size 1.125

Extents 

Extent
Description
Publication date

Temporal extent
Date and time 2010-05-01

Extent
Geographic extent
Bounding rectangle
West longitude -104.429067
East longitude -96.553269
South latitude 45.69933
North latitude 49.228563

Extent
Geographic extent
Bounding rectangle
Extent type  Extent used for searching
*West longitude -104.048918
*East longitude -96.554509
*North latitude 49.000691
*South latitude 45.935018
*Extent contains the resource Yes

Extent in the item's coordinate system
*West longitude -104.048918
*East longitude -96.554509
*South latitude 45.935018
*North latitude 49.000691
*Extent contains the resource Yes

Resource Points of Contact 

Point of contact
Individual's name Marc Weber
Organization's name U.S. Environmental Protection Agency, Office of Research & Development (ORD) - National Health and Environmental Effects Research Laboratory (NHEERL)
Contact's position GIS Analyst
Contact's role  point of contact


Contact information
Phone
Voice (541) 754-4469

Address
Type both
Delivery point 200 S.W. 35th St.
City Corvallis
Administrative area OR
Postal code 97333
e-mail addressweber.marc@epa.gov

Contact instructions
<http:www.epa.gov> <http:www.epa.gov>



Resource Maintenance 

Resource maintenance
Update frequency  as needed


Resource Constraints 

Security constraints
Classification system FIPS Pub 199


Additional restrictions
Standard Technical Controls



Constraints
Limitations of use
The State of North Dakota has compiled this data according to conventional cartographic standards, using what is thought to be the most reliable information available.  This data is intended to make results of research available at the earliest possible date, but is not intended to constitute final or formal publication.  The State of North Dakota makes every effort to provide virus-free files but does not guarantee uncorrupted files.  The State of North Dakota does not guarantee this data to be free from errors, inaccuracies, or viruses, and disclaims any responsibility or liability for interpretations or decisions based on this data.

Spatial Reference 

ArcGIS coordinate system
*Type Geographic
*Geographic coordinate reference GCS_North_American_1983
*Coordinate reference details
Geographic coordinate system
Well-known identifier 4269
X origin -400
Y origin -400
XY scale 999999999.99999988
Z origin 0
Z scale 1
M origin 0
M scale 1
XY tolerance 8.98315284119521e-009
Z tolerance 0.001
M tolerance 0.001
High precision true
Left longitude -180
Latest well-known identifier 4269
Well-known text GEOGCS["GCS_North_American_1983", DATUM["D_North_American_1983", SPHEROID["GRS_1980", 6378137.0, 298.257222101]], PRIMEM["Greenwich", 0.0], UNIT["Degree", 0.0174532925199433], AUTHORITY["EPSG", 4269]]

Reference system identifier
*Value 4269
*Codespace EPSG
*Version 8.6.2


Spatial Data Properties 

Vector
*Level of topology for this dataset  geometry only


Geometric objects
Feature class name NDHUB.Ecoregions_Omernik
*Object type  composite
*Object count 70



ArcGIS Feature Class Properties
Feature class name NDHUB.Ecoregions_Omernik
*Feature type Simple
*Geometry type Polygon
*Has topology FALSE
*Feature count 70
*Spatial index TRUE
*Linear referencing FALSE



Data Quality 

Scope of quality information
Resource level  dataset




Data quality report - Conceptual consistency
Measure description
Although ecoregion polygons and attributes have been checked for accuracy, some errors may remain. Polygons along state borders were reviewed and updated, May 2010.





Data quality report - Completeness omission
Measure description
Level IV ecoregions are not complete for California and Arizona, as of May, 2010. For these states, the polygons are for Level III or lower. The field 'US_L4CODE" contains placeholder information derived from "US_L3CODE". Ecoregions were digitized at 1:250,000 scale and are intended for large geographic extents (i.e. states, multiple counties, or river basins). Use for smaller areas, such as individual counties or a 1:24,000 scale map boundary, is not recommended.





Data quality report - Absolute external positional accuracy
Dimension horizontal


Measure description
Data were collected using methods that have unknown accuracy (EPA National Geospatial Data Policy [NGDP] Accuracy Tier 10). For more information, please see EPA's NGDP at <http:epa.govgeospatialpolicies.html> <http:epa.govgeospatialpolicies.html>)





Lineage 

Process step
When the process occurred 2010-05-26
Description
1) U.S.G.S. 1:250,000 topographic maps are used to delineate the ecoregions. The lines drawn are manually digitized or scanned to produce georeferenced electronic files. 2) All base maps are joined together and errors along the edges are resolved. 3) Topology is established and the maps are reviewed for accuracy, completeness, and conformity with the original lines. Corrections are made as needed and topology regenerated. 4) Attributes are added. 5) Maps are plotted for visual inspection by two individuals and necessary changes made. 6) Ecoregions from all available states are merged and dissolved to identify and correct inconsistencies. 7) Polygons of the corrected seamless ecoregion features are extended beyond the coastal borders. 8) State and Ecoregion datasets are intersected. 9) Topology errors removed. 10) Final QA





Source data
Description
The state borders were derived from the dtl_st.sdc on the ArcGIS DVD provided by ESRI. It was modified by removing Alaska and Hawaii polygons and all but the State field, adding some coastal islands based on imagery or NHDPlus areas, and restoring topology (removing internal gaps and small overlaps). The EPA regions were added to this custom geodatabase (dtl_48plyf) prior to the intersection process with the seamless ecoregion data.





Distribution 

Distribution format
*Name SDE Feature Class


Fields 

Details for object NDHUB.Ecoregions_Omernik 
*Type Feature Class
*Row count 70


Field OBJECTID_1
 
*Alias OBJECTID_1
*Data type OID
*Width 4
*Precision 10
*Scale 0
*Field description
Internal feature number.

*Description source
ESRI

*Description of values
Sequential unique whole numbers that are automatically generated.





Field OBJECTID
 
*Alias OBJECTID
*Data type Integer
*Width 4
*Precision 9
*Scale 0




Field US_L4CODE
 
*Alias US_L4CODE
*Data type String
*Width 10
*Precision 0
*Scale 0




Field US_L4NAME
 
*Alias US_L4NAME
*Data type String
*Width 100
*Precision 0
*Scale 0




Field US_L3CODE
 
*Alias US_L3CODE
*Data type String
*Width 10
*Precision 0
*Scale 0




Field US_L3NAME
 
*Alias US_L3NAME
*Data type String
*Width 100
*Precision 0
*Scale 0




Field NA_L3CODE
 
*Alias NA_L3CODE
*Data type String
*Width 20
*Precision 0
*Scale 0




Field NA_L3NAME
 
*Alias NA_L3NAME
*Data type String
*Width 100
*Precision 0
*Scale 0




Field NA_L2CODE
 
*Alias NA_L2CODE
*Data type String
*Width 20
*Precision 0
*Scale 0




Field NA_L2NAME
 
*Alias NA_L2NAME
*Data type String
*Width 100
*Precision 0
*Scale 0




Field NA_L1CODE
 
*Alias NA_L1CODE
*Data type String
*Width 20
*Precision 0
*Scale 0




Field NA_L1NAME
 
*Alias NA_L1NAME
*Data type String
*Width 100
*Precision 0
*Scale 0




Field STATE_NAME
 
*Alias STATE_NAME
*Data type String
*Width 25
*Precision 0
*Scale 0




Field EPA_REGION
 
*Alias EPA_REGION
*Data type SmallInteger
*Width 2
*Precision 4
*Scale 0




Field L4_KEY
 
*Alias L4_KEY
*Data type String
*Width 125
*Precision 0
*Scale 0




Field L3_KEY
 
*Alias L3_KEY
*Data type String
*Width 125
*Precision 0
*Scale 0




Field L2_KEY
 
*Alias L2_KEY
*Data type String
*Width 125
*Precision 0
*Scale 0




Field L1_KEY
 
*Alias L1_KEY
*Data type String
*Width 125
*Precision 0
*Scale 0




Field SHAPE
 
*Alias Shape
*Data type Geometry
*Width 4
*Precision 0
*Scale 0
*Field description
Feature geometry.

*Description source
ESRI

*Description of values
Coordinates defining the features.





Field SHAPE.AREA
 
*Alias SHAPE.AREA
*Data type Double
*Width 0
*Precision 0
*Scale 0




Field SHAPE.LEN
 
*Alias SHAPE.LEN
*Data type Double
*Width 0
*Precision 0
*Scale 0






References 

Aggregate Information
Association type  cross reference


Aggregate resource name
Title Ecoregions of the United States




Metadata Details 

Metadata language English (UNITED STATES)


Scope of the data described by the metadata  dataset
Scope name* dataset


*Last update 2016-01-13


ArcGIS metadata properties
Metadata format ArcGIS 1.0
Standard or profile used to edit metadata FGDC


Last modified in ArcGIS for the item 2016-01-13 13:14:36


Automatic updates
Last update 2016-01-13 13:14:36


Metadata Contacts 

Metadata contact
Individual's name Colleen Burch Johnson
Organization's name SRA Raytheon Contractors to US EPA
Contact's position GIS Analyst
Contact's role  point of contact


Contact information
Phone
Voice (541) 754-4454

Address
Type both
Delivery point 200 S.W. 35th St
City Corvallis
Administrative area OR
Postal code 97333
e-mail addressjohnson.colleen@epa.gov

Contact instructions
<http:www.epa.gov> <http:www.epa.gov>



Metadata Maintenance 

Maintenance
Date of next update 2014-09-20
Update frequency  unknown