Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 1997 Title: State Boundaries of the U.S. Publication_Information: Publication_Place: Reston, Virginia Publisher: U.S. Geological Survey Description: Abstract: This data set portrays the state boundaries of the United States. The data set was created by extracting the state boundary polygons from the individual 1:2,000,000-scale state boundary Digital Line Graph (DLG) files produced by the U.S. Geological Survey. These files were then paneled into a single coverage. Purpose: These data were created to serve as a base layer for the National Atlas of the United States of America. Supplemental_Information: Revisions: 1) 19980322 - Corrected topological problems in the data (slivers along state boundaries). 2) 19980514 - Minor modifications were made to boundaries in Alaska 3) 6/29/98 - Corrected ellipsoid name from WGS84 to GRS1980 and changed flattening ratio. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1972 Ending_Date: 1998 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: Irregular 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: boundaries Theme_Keyword: state boundaries Theme_Keyword: United States Place: Place_Keyword_Thesaurus: None Place_Keyword: United States Access_Constraints: None Use_Constraints: None. Acknowledgment of the National Atlas of the United States of America would be appreciated in products derived from these data. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Steve Kambly Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: 561 National Center City: Reston State_or_Province: VA Postal_Code: 20192 Contact_Voice_Telephone: 703-648-5094 Contact_Electronic_Mail_Address: skambly@usgs.gov Native_Data_Set_Environment: This data is presently stored in ESRI shapefile format. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Accuracy at the DLG level was tested by one or more of the following methods: - manual comparison of the source with hard copy plots. - symbolized display of the digital line graph on an interactive computer graphic system. - Selected attributes that could not be visually verified on plots or on screen were interactively queried and verified on screen. Logical_Consistency_Report: Using ESRI's ARC/INFO GIS software, the data set was checked for label errors, dangling nodes, and intersections. The data set was then built for polygon topology using the "BUILD" command. Completeness_Report: Data completeness generally reflects the content of the original DLG file. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: In DLG format, files underwent comparison to a graphic source or image source that was used as control to assess digital positional accuracy. During conversion to ARC/INFO coverage format and during the MAPJOIN process to panel the states together, node snapping and fuzzy tolerances may have caused minimal positional shifts. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 1995 Title: 1:2,000,000-scale Digital Line Graph Data Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Source_Scale_Denominator: 2000000 Type_of_Source_Media: CD-ROM Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1970 Ending_Date: 1995 Source_Currentness_Reference: publication date Source_Contribution: Spatial and attribute information Source_Citation_Abbreviation: nn2milbd.do where nn = state abbreviation Process_Step: Process_Description: This file was originally digitized by the National Mapping Division based on the sectional maps contained in 'The National Atlas of the United States of America' published by the USGS in 1970. The sectional maps were updated during 1978-1981 and digitized in the early 1980's. The data were updated again in the early 1990's by the USGS and published on CD-ROM in 1995 as state DLGs. These state files have been recently updated. Using ARC/INFO software, the DLG optional format files were converted to ARC/INFO coverages using the DLGARC command. Only state political boundaries and attribute information were extracted for inclusion. It was determined that state boundary lines that crossed open water would be excluded for graphic purposes and that polygons that represented islands would be attributed with the appropriate state information. The individual state coverages were then paneled together using the ARC/INFO command MAPJOIN. "Slivers" created during the MAPJOIN process were identified and deleted using the ELIMINATE command. Minor attribute corrections were made, and sliver polygons between North Dakota and Montana, and Oregon and California were removed. Source_Used_Citation_Abbreviation: nn2milbd.do where nn = state abbreviation Process_Date: 1996, 1997, 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: 2839 SDTS_Point_and_Vector_Object_Type: complete chain Point_and_Vector_Object_Count: 3556 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 1983 Ellipsoid_Name: GRS1980 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257222 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: STATESP020.PAT Entity_Type_Definition: Attribute table of STATESP020 polygons. Entity_Type_Definition_Source: ARC/INFO Attribute: Attribute_Label: AREA Attribute_Definition: Area of poly/region in square coverage units Attribute_Definition_Source: software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Maximum: positive real number Range_Domain_Minimum: positive real number Attribute_Measurement_Frequency: None planned Attribute: Attribute_Label: PERIMETER Attribute_Definition: Perimeter of poly/region in coverage units Attribute_Definition_Source: software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: positive real number Range_Domain_Maximum: positive real number Attribute_Measurement_Frequency: None planned Attribute: Attribute_Label: STATESP020# Attribute_Definition: Polygon internal identification number Attribute_Definition_Source: software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: positive integer Attribute_Measurement_Frequency: None planned Attribute: Attribute_Label: STATESP020-ID Attribute_Definition: Polygon user identification number Attribute_Definition_Source: software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: positive integer Attribute_Measurement_Frequency: None planned Attribute: Attribute_Label: STATE Attribute_Definition: Abbreviation of state Attribute_Definition_Source: FIPS PUB 5-2 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. Codeset_Source: FIPS PUB 5-2 Attribute_Measurement_Frequency: None planned Attribute: Attribute_Label: STATE_FIPS Attribute_Definition: 2-digit state FIPS code Attribute_Definition_Source: FIPS PUB 5-2 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. Codeset_Source: FIPS PUB 5-2 Attribute_Measurement_Frequency: None planned Overview_Description: Entity_and_Attribute_Overview: !The polygon attribute table: !COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ! 1 AREA 4 12 F 3 ! 5 PERIMETER 4 12 F 3 ! 9 STATESP020# 4 5 B - !13 STATESP020-ID 4 5 B - !17 STATE 20 20 C - !37 STATE_FIPS 2 2 C - Entity_and_Attribute_Detail_Citation: none Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Bruce Wright Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical 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: None Metadata_Reference_Information: Metadata_Date: 19980306 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Bruce Wright Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical 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: 19940608 Metadata_Security_Information: Metadata_Security_Classification_System: None Metadata_Security_Classification: Unclassified Metadata_Security_Handling_Description: None