Metadata for 1:2,000,000-scale Digital Line Graphs

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.

Table of Contents

Identification_Information:



    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.

Data_Quality_Information

    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

Spatial_Data_Organization_Information

    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

Spatial_Reference_Information:

    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

Entity_and_Attribute_Information:

    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>

Distribution_Information:

    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_Reference_Information:

    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