metadata.txt

电子地图服务器,搭建自己的地图服务

        standards and use coordinates defined by the North American Datum, 
        1983.  For the contiguous 48 States, the cartographic fidelity of 
        most of the TIGER/Line files, in areas outside the 1980 census 
        Geographic Base File/Dual Independent map Encoding (GBF/DIME) file 
        coverage and selected other large metropolitan areas, compare 
        favorably with the USGS 1:100,000-scale maps.  The Census Bureau 
        cannot specify the accuracy of features inside of what was the 
        1980 GBF/DIME-File coverage or selected metropolitan areas.  The 
        Census Bureau added updates to the TIGER/Line files that enumerators 
        annotated on maps sheets prepared from the Census TIGER database as 
        they attempted to traverse every street feature shown on the Census 
        2000 map sheets; the Census Bureau also made other corrections from 
        updated map sheets supplied by local participants for Census Bureau 
        programs.  The locational accuracy of these updates is of unknown 
        quality.  In addition to the Federal, State, and local sources, 
        portions of the files may contain information obtained in part from 
        maps and other materials prepared by private companies.  Despite the 
        fact the TIGER/Line data positional accuracy is not as high as the 
        coordinate values imply, the six-decimal place precision is useful 
        when producing maps.  The precision allows features that are next 
        to each other on the ground to be placed in the correct position, 
        on the map, relative to each other, without overlap.
  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator:
            U.S. Department of Commerce
            U.S. Census Bureau
            Geography Division
          Publication_Date: Unpublished material
          Title: Census TIGER database
          Edition: UA Census 2000
      Type_of_Source_Media: On line
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 2000
        Source_Currentness_Reference: Date the file was made available 
          to create TIGER/Line File extracts.
      Source_Citation_Abbreviation: TIGER
      Source_Contribution:
        Selected geographic and cartographic information (line segments) 
        from the Census TIGER database.
    Process_Step:
      Process_Description:
        In order for others to use the information in the Census TIGER 
        database in a GIS or for other geographic applications, the 
        Census Bureau releases periodic extracts of selected information 
        from the Census TIGER database, organized as topologically 
        consistent networks.  Software (TIGER DB routines) written by 
        the Geography Division allows for efficient access to Census 
        TIGER system data.  TIGER/Line files are extracted from the 
        Census TIGER database by county or statistical equivalent 
        area.  Census TIGER data for a given county or statistical
        equivalent area is then distributed among 19 fixed length 
        record ASCII files, each one containing attributes for either 
        line, polygon, or landmark geographic data types.  The Census 
        Bureau has released various versions of the TIGER/Line files
        since 1988, with each version having more updates (feature 
        and feature names, address ranges and ZIP Codes, coordinate 
        updates, revised field definitions, etc.) than the previous 
        version.
      Source_Used_Citation_Abbreviation: Census TIGER database
      Process_Date: 2000
Spatial_Data_Organization_Information:
  Indirect_Spatial_Reference:
    Federal Information Processing Standards (FIPS) and feature 
    names and addresses.
  Direct_Spatial_Reference_Method: Vector
  Point_and_Vector_Object_Information:
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: Node, network
      Point_and_Vector_Object_Count: 570 to 56,000
      SDTS_Point_and_Vector_Object_Type: Entity point
      SDTS_Point_and_Vector_Object_Type: Complete chain
      Point_and_Vector_Object_Count: 790 to 83,000
      SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
      Point_and_Vector_Object_Count: 290 to 33,000
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Geographic:
      Latitude_Resolution: 0.000458
      Longitude_Resolution: 0.000458
      Geographic_Coordinate_Units: Decimal degrees
Entity_and_Attribute_Information:
  Overview_Description:
    Entity_and_Attribute_Overview:
      The TIGER/Line files contain data describing three major
      types of features/entities;  This dataset uses just the
      Rail line Features.
    Entity_and_Attribute_Detail_Citation:
      U.S. Census Bureau, TIGER/Line files, 2002 Technical 
      Documentation.  The TIGER/Line documentation defines the terms 
      and definitions used within the files.
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization:
          U.S. Department of Commerce
          U.S. Census Bureau
          Geography Division
          Geographic Products Management Branch
      Contact_Address:
        Address_Type: Physical address
        Address: 8903 Presidential Parkway, Room 303 WP I
        City: Upper Marlboro
        State_or_Province: Maryland
        Postal_Code: 20772
      Contact_Voice_Telephone: [phone]
      Contact_Address:
        Address_Type: Mailing address
        Address: 4700 Silver Hill Road, Stop 7400
        City: Washington
        State_or_Province: District of Columbia
        Postal_Code: 20233-7400
      Contact_Voice_Telephone: [phone]
      Contact_Facsimile_Telephone:
        [phone]
        Contact_Electronic _Mail_Address: [e-mail]
  Resource_Description: 2002 TIGER/Line Files
  Distribution_Liability:
    No warranty, expressed or implied is made and no liability is
    assumed by the U.S. Government in general or the U.S. Census 
    Bureau in specific as to the positional or attribute accuracy 
    of the data.  The act of distribution shall not constitute 
    any such warranty and no responsibility is assumed by the U.S.
    Government in the use of these files.
  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: TGRLN (compressed)
        Format_Version_Number: 2002
        Format_Version_Date: 2002
        File_Decompression_Technique: PK-ZIP, version 1.93A or higher
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: www.census.gov/geo/www/tiger
    Fees:
      The online copy of the TIGER/Line files may be accessed without 
      charge.  See http://www.census.gov/geo/www/tiger for information 
      on availability on CD-ROM/DVD and associated costs for these 
      products.
    Ordering_Instructions:
      To obtain more information about ordering TIGER/Line files visit
      http://www.census.gov/geo/www/tiger.
      Technical_Prequisites: The 2002 TIGER/Line files contain 
      geographic data only and do not include display or mapping software 
      or statistical data.  For information on how to use the TIGER/Line
      data with a specific software package users should contact the
      company that produced the software.  A list of vendors who have 
      developed software capable of processing TIGER/Line files can be 
      found by visiting http://www.census.gov/geo/www/tiger.  The 
      TIGER/Line files are provided in ASCII text format only.  Users 
      are responsible for converting or translating the files into a 
      format used by their specific software package.
Metadata_Reference_Information:
  Metadata_Date: 2002
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization:
          U.S. Department of Commerce
          U.S. Census Bureau
          Geography Division
          Geographic Products Management Branch
      Contact_Address:
        Address_Type: Physical Address
        Address: 8903 Presidential Parkway, Room 303 WP I
        City: Upper Marlboro
        State_or_Province: Maryland
        Postal_Code: 20772
      Contact_Voice_Telephone: [phone]
      Contact_Electronic_Mail_Address: [e-mail]
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: 19940608