scounty2m: County boundaries of the Southern United States at 1:2,000,000 scale

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Yockey, Edwin
Publication_Date: 2009
Title:
scounty2m: County boundaries of the Southern United States at 1:2,000,000 scale
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Asheville, NC
Publisher: USDA Forest Service, Southern Research Station
Online_Linkage: https://doi.org/10.2737/RDS-2009-0002
Description:
Abstract:
This coverage was identified on the USGS Water Resources NSDI Node site at https://nsdi.usgs.gov. The coverage contains the County boundaries of the continental United States. These boundaries were derived from the Digital Line Graph (DLG) files representing the 1:2,000,000 scale map in the National Atlas of the United States.

The data was then modified by USDA Forest Service Personnel for use in the Southern Forest Resource Assessment and exported to a shapefile.
Purpose:
This shapefile is used as a base map for a variety of applications.
Supplemental_Information:
Metadata was updated 10/6/2009 when data became available through this archive, and again on 2/8/2011 to add a DOI to citation. Data were not altered. Minor metadata updates made on 4/18/2013.

Data were originally made available at https://www.srs.fs.usda.gov/sustain/data/.

Minor metadata updates on 12/20/2016.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2000
Currentness_Reference:
publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Unknown
Spatial_Domain:
Description_of_Geographic_Extent:
The counties included in the coverage are within the following states: AL=ALABAMA, AR=ARIZONA, FL=FLORIDA, GA=GEORGIA, KY=KENTUCKY, LA=LOUISIANA, MS=MISSISSIPPI, NC=NORTH CAROLINA, OK=OKLAHOMA, SC=SOUTH CAROLINA, TN=TENNESSEE, TX=TEXAS, and VA=VIRGINIA.
Bounding_Coordinates:
West_Bounding_Coordinate: -108.018264
East_Bounding_Coordinate: -74.834524
North_Bounding_Coordinate: 39.952118
South_Bounding_Coordinate: 23.796542
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: counties
Theme_Keyword: Administrative and political boundaries
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: boundaries
Theme_Keyword: imageryBaseMapsEarthCover
Theme:
Theme_Keyword_Thesaurus: National Research & Development Taxonomy
Theme_Keyword: Ecology, Ecosystems, & Environment
Theme_Keyword: Geography
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Southern United States
Place_Keyword: Alabama
Place_Keyword: Arizona
Place_Keyword: Florida
Place_Keyword: Georgia
Place_Keyword: Kentucky
Place_Keyword: Louisiana
Place_Keyword: Mississippi
Place_Keyword: North Carolina
Place_Keyword: Oklahoma
Place_Keyword: South Carolina
Place_Keyword: Tennessee
Place_Keyword: Texas
Place_Keyword: Virginia
Access_Constraints: None
Use_Constraints:
These data can be used without additional permissions or fees. If you use these data in a publication, presentation, or other research product please use the following citation:

Yockey, Edwin. 2009. scounty2m: County boundaries of the Southern United States at 1:2,000,000 scale. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. https://doi.org/10.2737/RDS-2009-0002
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USDA Forest Service, Southern Research Station
Contact_Person: Mr. John M. Pye
Contact_Position: Ecologist
Contact_Address:
Address_Type: mailing and physical address
Address: USDA Forest Service, SRS4851
Address: 3041 E. Cornwallis Rd.
City: Research Triangle Park
State_or_Province: NC
Postal_Code: 27709
Country: USA
Contact_Voice_Telephone: 919-549-4013
Contact_Electronic_Mail_Address: jpye@fs.fed.us
Data_Set_Credit:
1) USGS- the original county boundary coverage.
2) USDA Forest Service- modifications to data for use in the Southern Forest Resource Assessment (SFRA).
Security_Information:
Security_Classification_System:
Security_Classification: Unclassified
Security_Handling_Description:
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 3; ESRI ArcCatalog 8.3.0.800
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
All counties are accurately labeled.
Logical_Consistency_Report:
Polygon topology is present.

Assessment-standard projection:
Projection: Albers Equal Area
Units: Meters
Spheroid: GRS80
Datum: NAD83
First Standard Parallel: 27 degrees 30 minutes
Second Standard Parallel: 37 degrees 30 minutes
Central Meridian: -90 degrees 00 minutes
Latitude of Origin: 25 degrees 00 minutes
False Easting: 0.0
False Northing: 0.0
Completeness_Report:
All polygons have been reviewed for attribution accuracy. A quality control inspection has been performed to eliminate any missing or duplicate labels in the shapefile.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
All linear delineations are within National Map Accuracy Standards.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 1016.
Horizontal_Positional_Accuracy_Explanation:
+/- 1016 meters
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Mr. K.J. Lanfear, USGS
Publication_Date: 1994
Title:
county2m.e00.gz
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: USGS
Other_Citation_Details:
file name: county2m.e00.gz
Online_Linkage: <ftp://nsdi.usgs.gov/>
Type_of_Source_Media: Arc Info export coverage
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1994
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Source_Contribution:
USGS 1:2,000,000 Counties coverage
Process_Step:
Process_Description:
This coverage was identified on the USGS Water Resources NSDI Node site at https://nsdi.usgs.gov. The coverage contains the County boundaries of the continental United States. These boundaries were derived from the Digital Line Graph (DLG) files representing the 1:2,000,000 scale map in the National Atlas of the United States (please see below USGS_Procedures_Used referenced from USGS metadata).

USGS_Procedures_Used: This series of maps was published as part of the National Atlas of the United States (USGS, 1970). The maps for the conterminous United States were digitized in 15 sheets and published in the Digital Line Graph (DLG) format as described by Domeratz and others (1983).

Each sheet was prepared by reading the DLG files of the political and water bodies layers, converting them to ARC/INFO, extracting the county boundaries and the coastline, respectively, and joining the two layers together. FIPS codes were assigned to all polygons using available sources, and were checked manually.

Boundaries with adjacent sheets of the 15-sheet set were edgematched manually, arbitrarily choosing one of the sheets as the "correct" border. Edgematching operations adjusted the linework as far as was necessary so that the coverages would fit to a tolerance of 100 meters. The coverage (referred to herein as Version 1.0) was stored as 49 separate coverages (48 states and the District of Columbia) because the ARC/INFO software in use at the time could not process the entire coverage. Individual states could be joined by specifying a tolerance of 100 meters.

From time to time, adjustments were made to the state coverages to reflect changes in U.S. counties. It is believed the accuracy of these adjustments is comparable to the original linework.

For Version 2.0, all state coverages were rejoined and manually edited to produce a perfect edgematch between all states. For states on the original map sheet boundaries, this adjustment averaged less than 20 meters and in no case was more than 100 meters. The whole coverage was CLEANed to a tolerance of 20 meters, which resulted in few, if any, effects on small offshore islands. The coverage also was checked to ensure that it represented current U.S. counties or county equivalents.

The coverage in Version 1.0 stopped at the coastline. There was no attempt to depict offshore areas. The created some problems when the coverage was used to assign county codes to sampling stations located near the coast. To help in this matter, Version 2.o includes offshore extensions of the county polygons. The (water) boundaries of many of these polygons are arbitrary.

The Canadian Great Lakes features are another new addition to Version 2.0. They were added to improve the utility of the coverage for visual displays. Although the Canadian Great Lakes are logically represented by a single polygon, practical considerations -- the inability of some software to plot polygons with a large number of vertices -- made it necessary to separate them into 4 polygons. The dividing lines are located in narrow channels to minimize interference with plotting patterns. Canadian islands within the Great Lakes also were included.

All tics were relocated to places that are easily visible on maps of the United States, to help in registering maps that may not otherwise have adequate registration information.

To expedite accessing parts of the coverage, certain items have been indexed with the procedure, index_county.aml. See Section 3. A spatial index also was created.

When using this coverage to clip or intersect other coverages, a tolerance as low as 2 meters can be used.

The processing used to derive this coverage moved boundaries from their positions on the original maps. In cases of conflicting lines, preference was given to forming the correct topology. Strictly speaking, this coverage is not identical to the source materials. These changes were unavoidable in producing a continuous coverage of the conterminous United States.

For revision 2.1, it was necessary to alter about 100 arcs. This was accomplished with ARCEDIT using the 1:100,000 TIGER county coverage as a background. These arcs were matched to the background so that they matched at least as close as other arcs that were not edited.

Related Spatial and Tabular Data Sets: This coverage is part of series of 1:2,000,000-scale basemaps covering the United States. Layers presently available in this set include:

county2m -- County and state boundaries.

waterbod2m -- Water Bodies.

huc2m -- Hydrologic cataloging units (basins).

For Version 2.3.1, USGS corrected the following 2 errors found in version 2.3. First, a duplicate label in the water polygon for Hampton, VA, FIPS 51650 was removed. Second, the PLYTYPE attribute was corrected to PLYTYPE=9 for the external polygon. Because this had been set to 0 in some prior processing, the BNDTYPE values for outside arcs were not correct. Ran index_county.aml to correct the BNDTYPE values.

Other References Cited: Domaratz, M. A., Hallam, C. A., Schmidt, W. E., and Calkins, H. W., 1983. USGS Digital Cartographic Data Standards: Digital Line Graphs from 1:2,000,000-scale Maps. U.S. Geological Survey Circular 895-D, 38p.

U. S. Geological Survey, 1970. National atlas of the United States of America: Washington D.C., U. S. Geological Survey, 417p.

USDA Forest Service Modifications:

Sept. & Oct.-2000:
The coverages were downloaded by USDA Forest Service personnel on 22-Sep-2000 in compressed Arc Info Export format along with their associated metadata. The coverages were then reprojected to match Assessment standard Albers using the Arc Info PROJECT command, subsetted to the thirteen Southern states of the Assessment using Arc View's Theme Query tool and state FIPS code, then exported as shapefiles.

14-NOV-2000:
In early November 2000 two problems were discovered with the two county coverages:

1. slivers were found associated with Virginia county boundaries, these were manually edited and removed
2. multiple records per county or municipality interfered with join operations and subsequent analyses, these were similarly identified and removed.

Both operations were performed on the Albers-projected shapefiles and renamed as scty100 and scty2m. These have replaced the USGS county coverages on the Assessment web site.
Process_Date: 20001114
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USDA Forest Service
Contact_Person: Mr. Edwin Yockey
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing address
Address: PO Box 2680
City: Asheville
State_or_Province: NC
Postal_Code: 28801
Country: USA
Contact_Voice_Telephone: 828-257-4857
Contact_Facsimile_Telephone: 828-257-4856
Contact_Electronic_Mail_Address: eyockey@fs.fed.us
Process_Step:
Process_Description:
Metadata imported.
Source_Used_Citation_Abbreviation:
L:\forest\sfra\download_data\county_bound\albers\scty100\scounty100.xml
Process_Date: Unknown
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 1342
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Albers Conical Equal Area
Albers_Conical_Equal_Area:
Standard_Parallel: 27.500000
Standard_Parallel: 37.500000
Longitude_of_Central_Meridian: -90.000000
Latitude_of_Projection_Origin: 25.000000
False_Easting: 0.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.004096
Ordinate_Resolution: 0.004096
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257222
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Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: scounty2m
Entity_Type_Definition:
Entity_Type_Definition_Source:
Attribute:
Attribute_Label: FID
Attribute_Definition:
Internal feature number
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition:
Feature geometry
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Coordinates defining the features.
Attribute:
Attribute_Label: AREA
Attribute_Definition:
The size of the shape in shapefile units
Attribute_Definition_Source:
ESRI
Attribute:
Attribute_Label: PERIMETER
Attribute_Definition:
The perimeter of the shape in shapefile units
Attribute_Definition_Source:
ESRI
Attribute:
Attribute_Label: COUNTY2M_
Attribute_Definition:
Attribute_Definition_Source:
Attribute:
Attribute_Label: COUNTY2M_I
Attribute_Definition:
Attribute_Definition_Source:
Attribute:
Attribute_Label: FIPS
Attribute_Definition:
User attributed state and county FIPS zone
Attribute_Definition_Source:
US Geological Survey
Attribute:
Attribute_Label: ST
Attribute_Definition:
User attributed two letter abbreviations for the state (i.e. TX)
Attribute_Definition_Source:
US Geological Survey
Attribute:
Attribute_Label: CNTYNAME
Attribute_Definition:
User attributed county name
Attribute_Definition_Source:
US Geological Survey
Attribute:
Attribute_Label: PLYTYPE
Attribute_Definition:
User defined attribute (i.e. 0 is US Land)
Attribute_Definition_Source:
US Geological Survey
Attribute:
Attribute_Label: WORKB
Attribute_Definition:
Attribute_Definition_Source:
Attribute:
Attribute_Label: FIPSST
Attribute_Definition:
User attributed state FIPS zone
Attribute_Definition_Source:
US Geological Survey
Attribute:
Attribute_Label: FIPSCNTY
Attribute_Definition:
User attributed county FIPS zone
Attribute_Definition_Source:
US Geological Survey
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USDA Forest Service, Research and Development
Contact_Position: Research Data Archivist
Contact_Address:
Address_Type: mailing and physical
Address: 240 West Prospect Road
City: Fort Collins
State_or_Province: CO
Postal_Code: 80526
Country: USA
Contact_Voice_Telephone: see Contact Instructions
Contact Instructions: This contact information was current as of December 2016. For current information see Contact Us page on: https://doi.org/10.2737/RDS.
Resource_Description: RDS-2009-0002
Distribution_Liability:
Data Content and Use Disclaimer

The USDA Forest Service, Southern Forest Resource Assessment or SFRA, provides data to users of digital geographic data. The USDA Forest Service is in no way condoning or endorsing the application of these data for any given purpose. It is the sole responsibility of the user to determine whether or not the data is suitable for the intended purpose. It is also the obligation of the user to apply the data in an appropriate and conscientious manner. The USDA Forest Service provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. Much of the USDA Forest Service data is based on and maintained with Arc Info and Arc View Software developed by the Environmental Systems Research Institute (ESRI). In addition, much of the information presented uses conventions and terms popularized by Arc Info and Arc View and their user community. USDA Forest Service in no way represents the interests of ESRI nor acts as an agent for them.

The metadata, data, or related materials may be updated without notification. If a user believes errors are present in the metadata, data or related materials, please use the information in (1) Identification Information: Point of Contact, (2) Metadata Reference: Metadata Contact, or (3) Distribution Information: Distributor to notify the Forest Service of the issues. Additional information is available at https://www.fs.fed.us/qoi.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: SHP
Format_Version_Number: See Format Specification
Format_Specification:
ESRI ArcView shapefile
Format_Information_Content:
Counties within the continental United States
File_Decompression_Technique: Files zipped with Winzip 14.0
Transfer_Size: 2.562
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.2737/RDS-2009-0002
Fees: none
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Metadata_Reference_Information:
Metadata_Date: 20161220
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USDA Forest Service, Southern Research Station
Contact_Person: Mr. John Pye
Contact_Position: Ecologist
Contact_Address:
Address_Type: mailing and physical address
Address: USDA Forest Service, SRS4851
Address: 3041 E. Cornwallis Rd.
City: Research Triangle Park
State_or_Province: NC
Postal_Code: 27709
Country: USA
Contact_Voice_Telephone: 919-549-4013
Contact_Electronic_Mail_Address: jpye@fs.fed.us
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: None
Metadata_Use_Constraints:
None
Metadata_Security_Information:
Metadata_Security_Classification_System:
Metadata_Security_Classification: Unclassified
Metadata_Security_Handling_Description:
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