National Atlas of the United States 200506 Reston, VA National Atlas of the United States <http://nationalatlas.gov/atlasftp.html?openChapters=chpbound#chpbound> This map layer portrays the State boundaries of the United States, and the boundaries of Puerto Rico and the U.S. Virgin Islands. The map layer 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 merged into a single coverage. This is an updated version of the June 2002 map layer; the date when each State was admitted to the United States was added. These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. No responsibility is assumed by the National Atlas of the United States in the use of these data. 1972 2005 Ground condition Complete Irregular 170 -64 72 17 ISO 19115 Topic Category boundaries None Boundaries State boundaries States Statehood None United States USA 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, DC, National Institute of Standards and Technology. Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware District of Columbia Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming Puerto Rico Virgin Islands U.S. Virgin Islands None None. Acknowledgment of the National Atlas of the United States of America would be appreciated in products derived from these data. Woodley Chu National Atlas of the United States Mailing address

12201 Sunrise Valley Dr

MS 561

Reston VA 20192 703-648-6375 atlasmail@usgs.gov The map layer was checked for topological consistency using the Arc/INFO command BUILD. No other checks for logical consistency were performed on this map layer. This map layer includes State boundaries for all 50 States, and boundaries for Puerto Rico and the U.S. Virgin Islands. Data completeness generally reflects the content of the original DLG files. U.S. Geological Survey 1995 Reston, VA U.S. Geological Survey 2000000 CD-ROM 1970 1995 Publication date 2MILBD Spatial and attribute information National Atlas of the United States 1998 Reston, VA National Atlas of the United States 2000000 Online 1998 Publication date ATLAS-HY98 Spatial information National Atlas of the United States 1998 Reston, VA National Atlas of the United States 2000000 Online 1998 Publication date ATLAS-STATES98 Spatial and attribute information National Atlas of the United States 199903 Reston, Virginia National Atlas of the United States 2000000 Online 199903 Publication date ATLAS-HY9903 Spatial and attribute information National Atlas of the United States 199903 Reston, VA National Atlas of the United States 2000000 Online 1999 Publication date ATLAS-STATES9903 Spatial and attribute information U.S. Geological Survey Unknown Reston, VA U.S. Geological Survey 100000 paper unknown publication date 1:100,000-scale base maps Spatial and attribute information National Atlas of the United States 199911 Reston, VA National Atlas of the United States 2000000 Online 1972 1999 Ground condition ATLAS-STATES199911 Spatial and attribute information National Atlas of the United States 200206 Reston, VA National Atlas of the United States 2000000 Online 1972 2001 Ground condition ATLAS-CNTY200206 Spatial and attribute information National Atlas of the United States 200206 Reston, VA National Atlas of the United States 2000000 Online 1972 2002 Ground condition ATLAS-STATES200206 Spatial and attribute information U.S. Government Printing Office 20031104 Washington, DC U.S. Government Printing Office <http://bensguide.gpo.gov/3-5/state/index.html> Online 20031104 Ground condition STATEHOOD Attribute information National Atlas of the United States 200301 Reston, VA National Atlas of the United States <http://nationalatlas.gov/atlasftp.html?openChapters=chpwater#chpwater> 2000000 Online 200301 Publication date ATLAS-hydro Spatial and attribute information The 2MILBD data files were originally digitized by the National Mapping Discipline of the U.S. Geological Survey (USGS), 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 DLG files were updated in 1997. 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. The file was compared to ATLAS-HY98. State boundary lines that crossed open water were excluded for graphic purposes, and polygons that represented islands were attributed with the appropriate State information. The individual State coverages were then merged together using the Arc/INFO command MAPJOIN. 'Slivers' created during the MAPJOIN process were identified and deleted using the ELIMINATE command. 2MILBD ATLAS-HY98 1998 ATLAS-STATES98 The spatial features in ATLAS-STATES98 were compared to ATLAS-HY9903 and modified where necessary. Incorrect attributes were corrected. Puerto Rico and the U.S. Virgin Islands were added. ATLAS-STATES98 ATLAS-HY9903 1999 ATLAS-STATES9903 A minor adjustment was made to the shoreline in Galveston Bay, Texas. ATLAS-STATES9903 1:100,000 scale base maps 1999 ATLAS-STATES199911 Boundary adjustments of 1 square mile or greater were made between the following: >1. Arkansas and Mississippi >2. Arkansas and Oklahoma >3. Arkansas and Tennessee >4. Idaho and Montana >5. Idaho and Oregon >6. Illinois and Missouri >7. Iowa and Nebraska >8. Louisiana and Mississippi >9. Missouri and Nebraska >10. Montana and Wyoming >11. Nebraska and South Dakota >12. Oklahoma and Texas >13. Tennessee and Virginia >14. Texas and Mexico (southern border of Texas) In addition, some minor adjustments were made to other States. ATLAS-CNTY200206 ATLAS-STATES199911 200205 ATLAS-STATES200206 Attributes were added that provide, for each State, the month, day, and year of admission to the United States. The order of admission was also added. In addition, two line segments along the Texas/Mexico border were modified to align to ATLAS-hydro. ATLAS-STATES200206 STATEHOOD ATLAS-hydro 200505 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 (FIPS 5-2): Washington, DC, National Institute of Standards and Technology. Vector GT-polygon composed of chains 2895 0.000278 0.000278 Decimal degrees North American Datum of 1983 GRS1980 6378137 298.257222 State (described by Statesp020.dbf) First order division of a nation, including States and State equivalents. National Atlas of the United States Shape The representation of the entity in the data. National Atlas of the United States Polygon 2-dimensional element ESRI GIS software Area The size of the shape in square coverage units. In the distributed file, coverage units represent square decimal degrees. National Atlas of the United States 0.000 267.357 Perimeter The perimeter of shape in coverage units. In the distributed file, coverage units represent decimal degrees. National Atlas of the United States 0.010 374.768 Statesp020 Internal feature number. National Atlas of the United States 2 2896 State The name of the State or State equivalent. National Atlas of the United States 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. U.S. Department of Commerce, National Institute of Standards and Technology State_fips The 2-digit FIPS code of the State or State equivalent. National Atlas of the United States 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. U.S. Department of Commerce, National Institute of Standards and Technology Order_adm An ordinal value indicating the State’s order of admission to the United States. National Atlas of the United States 1 50 0 The area is not a State. Washington, DC is a district, Puerto Rico is a commonwealth, and the U.S. Virgin Islands is a territory of the United States. National Atlas of the United States Month_adm The month when the State was admitted to the United States. National Atlas of the United States January December <blank> The area is not a State. Washington, DC is a district, Puerto Rico is a commonwealth, and the U.S. Virgin Islands is a territory of the United States. National Atlas of the United States Day_adm The day when the State was admitted to the United States. National Atlas of the United States 1 31 0 The area is not a State. Washington, DC is a district, Puerto Rico is a commonwealth, and the U.S. Virgin Islands is a territory of the United States. National Atlas of the United States Year_adm The year when the State was admitted to the United States. National Atlas of the United States 1787 1959 0 The area is not a State. Washington, DC is a district, Puerto Rico is a commonwealth, and the U.S. Virgin Islands is a territory of the United States. National Atlas of the United States Earth Science Information Center, U.S. Geological Survey Mailing address

507 National Center

Reston VA 20192 1-888-ASK-USGS (1-888-275-8747) 703-648-5920 In addition to the address above there are other ESIC offices throughout the country. A full list of these offices is at <http://ask.usgs.gov/esic_index.html>. 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 U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Geological Survey in the use of these data. ESRI Shapefile <http://nationalatlas.gov/atlasftp.html?openChapters=chpbound#chpbound> SDTS <http://nationalatlas.gov/atlasftp.html?openChapters=chpbound#chpbound> There is no charge for this map layer. 20060606 Peg Rawson National Atlas of the United States Mailing address

12201 Sunrise Valley Dr

MS 561

Reston VA 20192 703-648-4183 atlasmail@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 None Unclassified None