These metadata describe the 1:2,000,000-scale digital line graph holdings of the USGS for the conterminous United States. This is a data-set level implementation of the Content Standards for Digital Geospatial Metadata, and will be in place until file-specific information for individual digital line graphs is available.
Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 1980 Title: 1:2,000,000-scale Digital Line Graphs Publication_Information: Publication_Place: Reston, Virginia Publisher: U.S. Geological Survey Description: Abstract: The DLG data files derived from the 1:2,000,000-scale maps contain selected base categories of cartographic data in digital form. The data files are derived from the sectional maps of the 1970 National Atlas of the United States of America. The Boundaries category includes boundary information collected in two separate subcategories: (1) Political Boundaries and (2) Administrative Boundaries. The Hydrography data includes data in three separate subcategories: (1) Streams, (2) Water Bodies, and (3) Hypsography (Continental Divide only). The Transportation category of data includes major transportation systems collected in three separate subcategories: (1) Roads and Trails, (2) Railroads, and (3) Cultural Features (airports and Alaska pipeline). Purpose: DLG's depict information about geographic features on or near the surface of the Earth, terrain, and political and administrative units. These data were collected as part of the National Mapping Program. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1972 Ending_Date: 1979 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: Irregular Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -179.1000 East_Bounding_Coordinate: -067.9500 North_Bounding_Coordinate: 71.3833 South_Bounding_Coordinate: 18.9167 Keywords: Theme: Theme_Keyword_Thesaurus: None. Theme_Keyword: digital line graph Theme_Keyword: DLG Theme_Keyword: hydrography Theme_Keyword: transportation Theme_Keyword: boundaries Theme_Keyword: U.S. Public Land Survey System Theme_Keyword: hypsography 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: US Place_Keyword: CA Place_Keyword: MX 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: FIPS codes for states covered Access_Constraints: None Use_Constraints: None. Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data.
Attribute_Accuracy: Attribute_Accuracy_Report: Attribute accuracy was tested by manual comparison of the source with hard copy plots. Logical_Consistency_Report: The topological structure of each DLG file is fully validated by software. There are no extraneous intersections; that is , a line does not join or cross another line, or itself, except at a node. No line extends through a node. Polygon (area) adjacency is also validated; that is, area left and right topological attributes of lines are consistent throughout the file. The neatline is free of gaps. Validation of DLG data is performed for each category within a file. Completeness_Report: For Boundary category: Political boundaries: Data completeness generally reflects the content of the original source graphic. Selective updating of the maps was done prior to digitizing. The Political Boundaries category of data includes States and County boundaries. Administrative boundaries: Data completeness generally reflects the content of the original source graphic. Selective updating of the maps was done prior to digitizing. The Administrative Boundaries category of data includes federally administered forests, parks, and wildlife refuges. For Hydrography category: Streams: Data completeness generally reflects the content of the original source graphic. Selective updating of the maps was done prior to digitizing. The Hydrography category includes perennial and intermittent streams and canals. Water Bodies: Data completeness generally reflects the content of the original source graphic. Selective updating of the maps was done prior to digitizing. Water bodies include perennial, intermittent and dry lakes, swamps and glaciers. Hypsography: Data completeness generally reflects the content of the original source graphic. Selective updating of the maps was done prior to digitizing. Hypsography data is limited to the Continental Divide. For Transportation category: Roads and Trails: Data completeness generally reflects the content of the original source graphic. Selective updating of the maps was done prior to digitizing. The Roads and Trails category includes Interstate and primary State highways. Railroads: Data completeness generally reflects the content of the original source graphic. Selective updating of the maps was done prior to digitizing. The railroads category of data includes main line and branch line railroads. Cultural Features: Data completeness generally reflects the content of the original source graphic. Selective updating of the maps was done prior to digitizing. The Cultural Features are limited to airports and the Alaska pipeline. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Comparison to a graphic source or image source is used as control to assess digital positional accuracy. Cartographic offsets may be present on graphic sources, due to scale and legibility constraints. Data has been vertically aligned between categories of data. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 1970 Title: The National Atlas of the United States of America Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Reston, Virginia Publisher: U.S. Geological Survey Source_Scale_Denominator: 2000000 Type_of_Source_Media: stable-base material Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1970 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: MAP1 Source_Contribution: spatial and attribute information Source_Information: Source_Citation: Citation_Information: Originator: Bureau of the Census Publication_Date: 1979 Title: unknown Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Washington, D.C. Publisher: Bureau of the Census Other_Citation_Details: This source citation references a source used to revise the published 1:2,000,000-scale National Atlas sectional maps prior to digitization. Individual files within the series may or may not have been altered as a result of this source. Source_Scale_Denominator: various Type_of_Source_Media: various Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1979 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: REVBND1 Source_Contribution: spatial and attribute information to update political boundaries and Alaskan borough boundaries Source_Information: Source_Citation: Citation_Information: Originator: Various Federal Agencies Publication_Date: various Title: unknown Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: various Publisher: various Other_Citation_Details: This source citation references a source used to revise the published 1:2,000,000-scale National Atlas sectional maps prior to digitization. Individual files within the series may or may not have been altered as a result of this source. Source_Scale_Denominator: various Type_of_Source_Media: various Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: various Source_Currentness_Reference: publication date Source_Citation_Abbreviation: REVBND2 Source_Contribution: spatial and attribute information to update administrative boundaries Source_Information: Source_Citation: Citation_Information: Originator: various Publication_Date: 1980 Title: unknown Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: various Publisher: various Other_Citation_Details: This source citation references a source used to revise the published 1:2,000,000-scale National Atlas sectional maps prior to digitization. Individual files within the series may or may not have been altered as a result of this source. Source_Scale_Denominator: various Type_of_Source_Media: various Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1980 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: REVRAT1 Source_Contribution: spatial and attribute information to update roads and trails data Source_Information: Source_Citation: Citation_Information: Originator: Interstate Commerce Commission Publication_Date: 1979 Title: unknown Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Washington, D.C. Publisher: Interstate Commerce Commission Other_Citation_Details: This source citation references a source used to revise the published 1:2,000,000-scale National Atlas sectional maps prior to digitization. Individual files within the series may or may not have been altered as a result of this source. Source_Scale_Denominator: various Type_of_Source_Media: various Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1979 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: REVRRS1 Source_Contribution: spatial and attribute information to update railroad data Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 1979 Title: Landsat imagery Geospatial_Data_Presentation_Form: remote-sensing imagery Publication_Information: Publication_Place: Reston, Virginia Publisher: U.S. Geological Survey Other_Citation_Details: This source citation references a source used to revise the published 1:2,000,000-scale National Atlas sectional maps prior to digitization. Individual files within the series may or may not have been altered as a result of this source. Source_Scale_Denominator: various Type_of_Source_Media: various Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1979 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: REVHYD1 Source_Contribution: spatial and attribute information to update streams in Alaska Source_Information: Source_Citation: Citation_Information: Originator: National Oceanic and Atmospheric Administration Publication_Date: 1979 Title: Sectional Aeronautical Charts Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Washington, D.C. Publisher: National Oceanic and Atmospheric Administration Other_Citation_Details: This source citation references a source used to revise the published 1:2,000,000-scale National Atlas sectional maps prior to digitization. Individual files within the series may or may not have been altered as a result of this source. Source_Scale_Denominator: various Type_of_Source_Media: various Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1979 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: REVHYD2 Source_Contribution: spatial and attribute information to update major reservoirs Source_Information: Source_Citation: Citation_Information: Originator: Federal Aviation Administration Publication_Date: 1980 Title: Landsat imagery Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Washington, D.C. Publisher: Federal Aviation Administration Other_Citation_Details: This source citation references a source used to revise the published 1:2,000,000-scale National Atlas sectional maps prior to digitization. Individual files within the series may or may not have been altered as a result of this source. Source_Scale_Denominator: various Type_of_Source_Media: various Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1980 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: REVCUL1 Source_Contribution: spatial and attribute information to update cultural features and airport data Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 1979 Title: unknown Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Reston, Virginia Publisher: U.S. Geological Survey Other_Citation_Details: This source citation references a source used to revise the published 1:2,000,000-scale National Atlas sectional maps prior to digitization. Individual files within the series may or may not have been altered as a result of this source. Source_Scale_Denominator: various Type_of_Source_Media: various Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1979 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: REVCUL2 Source_Contribution: spatial and attribute information to update the Alaskan Pipeline 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. At the time of digitization in the late 1970s, most of the information contained in the maps was updated, using the latest available sourcematerials. The digital data were produced by manually digitizing from stable-based copy of the graphic material using a digitizing table with a resolution of 0.001 inches and an absolute accuracy of 0.003 to 0.005 inches. The digital data were checked for position by visually comparing proof plots with the graphic source. The digital data were checked for classification by manually checking proof plots against code listings. This file has undergone digital revision. The digital revision uses ancillary source, with no field verification Source_Used_Citation_Abbreviation: MAP 1, REVBND1, REVBND2, REVRAT1, REVRRS1, REVHYD1, REVHYD2, REVCUL1, REVCUL2 Process_Date: 1983
Indirect_Spatial_Reference: For Public Land Survey System: U.S. Department of the Interior, Bureau of Land Management: U.S. Public Land Survey System For Boundaries: 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. 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. U.S. Department of Commerce,1990, Counties and equivalent entities of The United States, its possessions, and associated areas (Federal Information Processing Standard 6-4): Washington, D.C. National Institute of Standards and Technology. Direct_Spatial_Reference_Method: Vector
Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Albers Conical Equal Area Albers_Conical_Equal_Area: Standard_Parallel: 1st standard parallel 29.5N for conterminous US; 8.0N for Hawaii; 55.0N for Alaska Standard_Parallel: 2nd standard parallel 45.5N for conterminous US; 18.0N for Hawaii; 65.0N for Alaska Longitude_of_Central_Meridian: 96.0W for conterminous US; 157.0W for Hawaii; 154.0W for Alaska Latitude_of_Projection_Origin: 23.0N for conterminous US; 3.0N for Hawaii; 50.0N for Alaska False_Easting: 0.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 50.80 Ordinate_Resolution: 50.80 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum 1927 Ellipsoid_Name: Clark 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98
Overview_Description: Entity_and_Attribute_Overview: DLG3 attribute codes are used to describe the physical and cultural characteristics of DLG node, line, and area elements. Attribute codes are used to reduce redundant information, provide enough reference information to support integration with larger data base, and describe the relationships between cartographic elements. Each DLG element has one or more attribute codes composed of a three digit major code and a four-digit minor code. Entity_and_Attribute_Detail_Citation: U.S.Department of the Interior, U.S.Geological Survey, 1990, 1:2,000,000-Scale Digital Line Graphs, Data Users Guide 3, Reston, Virginia A hypertext extract is available at: <URL: http://edcwww.cr.usgs.gov/glis/hyper/guide/2mil> Softcopy in ASCII format is available at: <URL: ftp://www-nmd.usgs.gov/pub/ti/DLG/2mdlgguide/dugdlg2m.txt> Softcopy in WordPerfect format is available at: <URL: ftp://www-nmd.usgs.gov/pub/ti/DLG/2mdlgguide/dugdlg2m.wp5> Softcopy in PostScript format is available at: <URL: ftp://www-nmd.usgs.gov/pub/ti/DLG/2mdlgguide/dugdlg2m.ps>
Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Earth Science Information Center, U.S.Geological Survey Contact_Address: Address_Type: mailing address Address: 507 National Center City: Reston State_or_Province: Virginia Postal_Code: 22092 Contact_Voice_Telephone: 1 800 USA MAPS Hours_of_Service: 0800-1600 Contact_Instructions: In addition to the address above there are other ESIC offices throughout the country. A full list of these offices is at: <URL: http://www-nmd.usgs.gov/esic/esic_index.html> Resource_Description: 1:2,000,000-scale digital line graphs 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. The Geological Survey will warrant the delivery of this product in computer-readable format, and will offer appropriate adjustment of credit when the product is determined unreadable by correctly adjusted computer input peripherals, or when the physical medium is delivered in damaged condition. Requests for adjustment of credit must be made within 90 day from the date of this shipment from the ordering site. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: DLG Format_Version_Date: 198805 Format_Specification: Optional Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: <URL: http://edcwww.cr.usgs.gov/glis/hyper/guide/2milfig/mapindex> Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: <URL: ftp://edcftp.cr.usgs.gov/pub/data/DLG/2M/> Offline_Option: Offline_Media: CD-ROM Recording_Format: ISO 9660 Offline_Option: Offline_Media: 9-track tape Recording_Capacity: Recording_Density: 1600 Recording_Density: 6250 Recording_Density_Units: characters per inch Recording_Format: ASCII; available unlabelled or with ANSI-standard labels; available block sizes are multiples of 80 characters ranging from 8000 to 32720 characters. Digital_Form: Digital_Transfer_Information: Format_Name: DLG Format_Version_Date: 198805 Format_Specification: Standard Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: <URL: http://edcwww.cr.usgs.gov/glis/hyper/guide/2milfig/mapindex> Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: <URL: ftp://edcftp.cr.usgs.gov/pub/data/DLG/2M/> Offline_Option: Offline_Media: CD-ROM Recording_Format: ISO 9660 Offline_Option: Offline_Media: 9-track tape Recording_Capacity: Recording_Density: 1600 Recording_Density: 6250 Recording_Density_Units: characters per inch Recording_Format: ASCII; available unlabelled or with ANSI- standard labels; available block sizes are multiples of 144 characters ranging from 8064 to 32720 characters. Fees: The online copy of the data set (when available electronically) may be accessed without charge. For 8-mm cartridge tape and 9-track tape the costs are: 1 digital product = $40 2 digital products = $60 3 digital products = $80 4 digital products = $100 5 digital products = $120 6 or more = $90 plus $7 per each product over six For CD-ROM the price for each disc is $32 A $3.50 handling charge is applied to all mail orders. Ordering_Instructions: The CD-ROM contains data for all 50 states.
Metadata_Date: 19901 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: 508 National Center City: Reston State_or_Province: Virginia Postal_Code: 22092 Contact_Voice_Telephone: 1 703 648 4543 Metadata_Standard_Name: Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: 19940608