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Metadata for the Urban Areas Map Layer
Urban Areas: Map Layer Description File
This map layer includes the outlines of major urban areas in the United States. The
Urban Areas map layer was compiled by the U.S.
Geological Survey and is derived from the Digital Chart of the World.
Metadata
What follows is very detailed technical information about this map layer. This is often
called metadata. Metadata (or "data about data") describe the content, quality,
condition, and other characteristics of data. Metadata are used to organize and maintain
investments in data, to provide information to data catalogs and clearinghouses, and to
aid data transfers. The Federal Geographic Data Committee
(FGDC) publishes the Content Standard
for Digital Geospatial Metadata. Many organizations within and outside of the federal
government have adopted the FGDC metadata standard and are using automated indexing and
serving mechanisms to provide access to their holdings through the Internet. Visit the FGDC Clearinghouse to
learn more about how metadata is used in clearinghouses and to search for other data sets.
Identification Information:
- Citation:
- Citation_Information:
- Originator: U.S. Geological Survey
- Publication_Date: 1998
- Title: Urban Areas of the U.S.
- Publication_Information:
- Publication_Place: Reston, Virginia
- Publisher: U.S. Geological Survey
-
- Description:
- Abstract:
- This data set includes a selection of urban areas in the United States derived from the
urban areas layer of the Digital Chart of the World (DCW).
- Purpose:
- The digital data sets of the National Atlas are used to create electronic and hard copy
maps that depict various aspects of the nation. The data can be used to conduct geographic
analysis on National and large regional scales. The digital data will provide a basis from
which future revisions of the atlas can be derived.
- Supplemental_Information:
- Revisions: 1) 6/29/98 - Corrected ellipsoid name from WGS84 to GRS1980 and changed
flattening ratio. 2) 11/13/98 - Added State FIPS attribute; move polygons for Altus, OK
and Olustee, OK; and edited STATES field for Kansas City and Washington Metro Area
- Time_Period_of_Content:
- Time_Period_Information:
- Single_Date/Time:
- Calendar_Date: 1996
- Currentness_Reference: publication date
-
- Status:
- Progress: Complete
- Maintenance_and_Update_Frequency: None planned
-
- Spatial_Domain:
- Bounding_Coordinates:
- West_Bounding_Coordinate: 172
- East_Bounding_Coordinate: -66
- North_Bounding_Coordinate: 72
- South_Bounding_Coordinate: 18
-
- Keywords:
- Theme:
- Theme_Keyword_Thesaurus: None
- Theme_Keyword: urban areas
- Place:
- Place_Keyword_Thesaurus:
- U.S. Department of Commerce, 1977, Countries, dependencies, areas of special
sovereignty, and their principal administrative divisions (Federal Information Processing
Standard 10-3): Washington, D.C., National Institute of Standards and Technology.
- Place_Keyword: United States
-
- Place:
- Place_Keyword_Thesaurus:
- U.S. Department of Commerce, 1987, Codes for the Identification of the States, the
District of Columbia and the Outlying Areas of The United States, and Associated Areas
(Federal Information Processing Standard 5-2): Washington, D.C., National Institute of
Standards and Technology.
- Place_Keyword: USA
- Place_Keyword: Alaska
- Place_Keyword: Alabama
- Place_Keyword: Arkansas
- Place_Keyword: Arizona
- Place_Keyword: California
- Place_Keyword: Colorado
- Place_Keyword: Connecticut
- Place_Keyword: Delaware
- Place_Keyword: Florida
- Place_Keyword: Georgia
- Place_Keyword: Hawaii
- Place_Keyword: Idaho
- Place_Keyword: Iowa
- Place_Keyword: Illinois
- Place_Keyword: Indiana
- Place_Keyword: Kansas
- Place_Keyword: Kentucky
- Place_Keyword: Louisiana
- Place_Keyword: Maine
- Place_Keyword: Massachusetts
- Place_Keyword: Maryland
- Place_Keyword: Michigan
- Place_Keyword: Minnesota
- Place_Keyword: Missouri
- Place_Keyword: Mississippi
- Place_Keyword: Montana
- Place_Keyword: North Carolina
- Place_Keyword: North Dakota
- Place_Keyword: Nebraska
- Place_Keyword: New Hampshire
- Place_Keyword: New Jersey
- Place_Keyword: New Mexico
- Place_Keyword: Nevada
- Place_Keyword: New York
- Place_Keyword: Ohio
- Place_Keyword: Oklahoma
- Place_Keyword: Oregon
- Place_Keyword: Pennsylvania
- Place_Keyword: Rhode Island
- Place_Keyword: South Carolina
- Place_Keyword: South Dakota
- Place_Keyword: Tennessee
- Place_Keyword: Texas
- Place_Keyword: Utah
- Place_Keyword: Vermont
- Place_Keyword: Virginia
- Place_Keyword: Wisconsin
- Place_Keyword: Washington
- Place_Keyword: West Virginia
- Place_Keyword: Wyoming
-
- Access_Constraints: None
-
- Use_Constraints:
- None. Acknowledgment of the U.S. Geological Survey would be appreciated in products
derived from these data.
- Point_of_Contact:
- Contact_Information:
- Contact_Person_Primary:
- Contact_Person: Bruce Wright
- Contact_Organization: U.S. Geological Survey
- Contact_Address:
- Address_Type: mailing address
- Address: 521 National Center
- City: Reston
- State_or_Province: VA
- Postal_Code: 20192
- Contact_Voice_Telephone: 703-648-4528
- Contact_Electronic_Mail_Address: bwright@usgs.gov
-
- Native_Data_Set_Environment: ESRI Shapefile format
- Data Quality Information:
- Logical_Consistency_Report:
- No additional checks for topological consistency were performed on this data set.
- Completeness_Report: none
-
- Lineage:
- Source_Information:
- Source_Citation:
- Citation_Information:
- Originator: National Imagery and Mapping Agency (NIMA)
- Publication_Date: 1994
- Title: Digital Chart of the World
- Publication_Information:
- Publication_Place: Reston, VA
- Publisher: U.S. Geological Survey
- Type_of_Source_Media: electronic mail system
- Source_Time_Period_of_Content:
- Time_Period_Information:
- Single_Date/Time:
- Calendar_Date: 1994
- Source_Currentness_Reference: publication date
- Source_Citation_Abbreviation: DCW
- Source_Contribution: spatial and attribute information
- Process_Step:
- Process_Description:
- Urban polygons from the Digital Chart of the World (DCW) CD-ROM were extracted and
converted to ARC/INFO format. Where the urban boundaries extend beyond the 1:2M shoreline,
the 2M shoreline was used by "CLIPPING" the urban polygons. Names of the urban
areas were added. In large metropolitan areas many smaller areas were labeled as part of
the metropolitan area. The state in which the urban area is located was also added.
Several areas were modified to conform to the 1:2,000,000-scale hydrography layer. Some
smaller polygons that represent undeveloped areas within the urban area were removed and
merged with the larger urban area. Military reservations were also removed.
- Process_Date: 1998
- Spatial Data Organization Information:
- Direct_Spatial_Reference_Method: Vector
-
- Point_and_Vector_Object_Information:
- SDTS_Terms_Description:
- SDTS_Point_and_Vector_Object_Type: Ring composed of chains
- Point_and_Vector_Object_Count: 6177
- SDTS_Terms_Description:
- SDTS_Point_and_Vector_Object_Type: Complete chains
- Point_and_Vector_Object_Count: 6185
- Spatial Reference Information:
- Horizontal_Coordinate_System_Definition:
- Geographic:
- Latitude_Resolution: 0.000278
- Longitude_Resolution: 0.000278
- Geographic_Coordinate_Units: Decimal Degrees
- Geodetic_Model:
- Horizontal_Datum_Name: North American Datum of 1983
- Ellipsoid_Name: GRS1980
- Semi-major_Axis: 6378137 meters
- Denominator_of_Flattening_Ratio: 298.257222
-
- Entity and Attribute Information:
- Detailed_Description:
- Entity_Type:
- Entity_Type_Label:
- Urban Areas of the United States, URBANAP020.DBF
- Entity_Type_Definition:
- Urban areas are places where large populations exist
- Entity_Type_Definition_Source: U.S. Geological Survey
- Attribute:
- Attribute_Label: Shape
- Attribute_Definition:
- The representation of the entity in the data.
- Attribute_Definition_Source: GIS Software
- Attribute_Domain_Values:
- Enumerated_Domain:
- Enumerated_Domain_Value: Polygon
- Enumerated_Domain_Value_Definition:
- 2-dimensional element
- Enumerated_Domain_Value_Definition_Source:
- GIS software
- Attribute:
- Attribute_Label: Area
- Attribute_Definition: Area of polygon in coverage units
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 0.000
- Range_Domain_Maximum: 0.218
- Attribute:
- Attribute_Label: Perimeter
- Attribute_Definition: Perimeter of polygon in coverage units
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 0.001
- Range_Domain_Maximum: 6.774
- Attribute:
- Attribute_Label: Urbanap020
- Attribute_Definition: Internal feature number
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 2
- Range_Domain_Maximum: 6177
- Attribute:
- Attribute_Label: Urbanap020
- Attribute_Definition: User-assigned feature number
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 2
- Range_Domain_Maximum: 7412
- Attribute:
- Attribute_Label: Name
- Attribute_Definition: Name of the urban area
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Unrepresentable_Domain:
- There is no predefined set of valid urban area names. Name represents the most
significant place that is in the polygon.
- Attribute:
- Attribute_Label: State
- Attribute_Definition:
- The 2-letter abbreviation for the State in which the county is located.
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Codeset_Domain:
- Codeset_Name:
- Codes for the Identification of the States, the District of Columbia and the Outlying
Areas of the United States, and Associated Areas, FIPS 5-2, 1987.
- Codeset_Source:
- U.S. Department of Commerce, National Institute of Standards and Technology
- Attribute:
- Attribute_Label: State_fips
- Attribute_Definition:
- The Federal Information Processing Standard (FIPS) code used by the U.S. Bureau of the
Census for the State in which the dam is located.
- Attribute_Definition_Source: U.S. Army Corps of Engineers
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 01
- Range_Domain_Maximum: 56
- Distribution Information:
- Distributor:
- Contact_Information:
- Contact_Person_Primary:
- Contact_Person: Bruce Wright
- Contact_Organization: U.S. Geological Survey
- Contact_Address:
- Address_Type: mailing address
- Address: 521 National Center
- City: Reston
- State_or_Province: VA
- Postal_Code: 20192
- Contact_Voice_Telephone: 703-648-4528
- Contact_Electronic_Mail_Address: bwright@usgs.gov
-
- Distribution_Liability:
- Although these data have been processed successfully on a computer system at the U.S.
Geological Survey, no warranty expressed or implied is made by the USGS regarding the
utility of the data on any other system, nor shall the act of distribution constitute any
such warranty.
- Metadata Reference Information:
-
- Metadata_Date: 19981113
- Metadata_Contact:
- Contact_Information:
- Contact_Person_Primary:
- Contact_Person: Bruce Wright
- Contact_Organization: U.S. Geological Survey
- Contact_Address:
- Address_Type: mailing address
- Address: 521 National Center
- City: Reston
- State_or_Province: VA
- Postal_Code: 20192
- Contact_Voice_Telephone: 703-648-4528
- Contact_Electronic_Mail_Address: bwright@usgs.gov
- Metadata_Standard_Name:
- FGDC Content Standards for Digital Geospatial Metadata
- Metadata_Standard_Version: FGDC-STD-001-1998
- Metadata_Security_Information:
- Metadata_Security_Classification_System: None
- Metadata_Security_Classification: Unclassified
- Metadata_Security_Handling_Description: None
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