Identification_Information
  Citation
    Citation_Information
      Originator:        U.S. Geological Survey
      Publication_Date:  1993
      Title:             Dearborn River 1:100,000 scale Quadrangle
      Geospatial_Data_Presentation_Form:  map
      Publication_Information
        Publication_Place:  Reston, Virginia
        Publisher:          U.S. Geological Survey
      Online_Linkage:  http://nris.state.mt.us/nsdi/drg.html
  Description
    Abstract:
        U.S. Geological Survey (USGS) Digital Raster Graphics (DRGs) are
        scanned raster images of USGS topographic maps including the collar
        information, georeferenced to the UTM grid.
 
        This file ia a USGS DRG quadrangle that has been projected to
        Montana State Plane Coordinates and had its collar removed.
 
        The quadrangle still has a white border outside the neatline
        due to the difference between grid north and true north.  To
        make these borders transparent so that adjacent quadrangles are
        not obscured in ArcView, download the Avenue program at
        http://nris.state.mt.us/nsdi/drgpages/drgtransparent.txt
        and run it as a script.
 
        Most DRGs in Montana were produced through an Innovative Partnership
        agreement between the Land Information Technology Company, Ltd., of
        Aurora, CO and the USGS.
    Purpose:
        A DRG is useful as a source or background layer in a GIS, as
        a means to perform quality assurance on other digital
        products, and as a source for the collection and revision of
        DLG data, e.g. DEMs or DOQs, to produce a hybrid digital
        file.
  Time_Period_of_Content
    Time_Period_Information
      Single_Date/Time
        Calendar_Date:  1993
    Currentness_Reference:  Publication Date
  Status
    Progress:  Complete
    Maintenance_and_Update_Frequency:  Unknown
  Spatial_Domain
    Bounding_Coordinates
      West_Bounding_Coordinate:   -113
      East_Bounding_Coordinate:   -112
      North_Bounding_Coordinate:  47.5
      South_Bounding_Coordinate:  47
  Keywords
    Theme
      Theme_Keyword_Thesaurus:  None
      Theme_Keyword:  digital raster graphic
      Theme_Keyword:  DRG
      Theme_Keyword:  topographic map
    Place
      Place_Keyword_Thesaurus:  None
      Place_Keyword:  Montana
      Place_Keyword:  Wyoming
      Place_Keyword:  Idaho
  Access_Constraints:
        None
  Use_Constraints:
        Acknowledgement of the USGS would be appreciated in products
        derived from these data.
  Point_of_Contact
    Contact_Information
      Contact_Organization_Primary
        Contact_Organization:  Montana State Library
        Contact_Person:        Gerry Daumiller
      Contact_Position:        Senior GIS Programmer
      Contact_Address
        Address_Type:  mailing address
        Address:            PO Box 201800
        City:               Helena
        State_or_Province:  Montana
        Postal_Code:        59620-1800
        Country:            USA
      Contact_Voice_Telephone:          (406) 444-5358
      Contact_Facsimile_Telephone:      (406) 444-0581
      Contact_Electronic_Mail_Address:  gdaumiller@state.mt.us
      Hours_of_Service:  Monday-Friday, 8-5, Mountain Time
  Browse_Graphic
    Browse_Graphic_File_Name:  http://nris.state.mt.us/nsdi/nris/drg100.gif
    Browse_Graphic_File_Description:  sample portion of a DRG image
    Browse_Graphic_File_Type:  gif
  Data_Set_Credit:
    Most DRGs in Montana were produced through and Innovative
    Partnership agreement between the Land Information Technology
    Company, Ltd., of Aurora, CO and the USGS.
 
Data_Quality_Information:
  Attribute_Accuracy
    Attribute_Accuracy_Report:
        A DRG is an 8-bit color image that employs a color pallette
        to ensure uniform colors throughout a particular DRG series.
        All DRG's within a series must have the same RGB value.
  Logical_Consistency_Report:
        Not Applicable
  Completeness_Report:
        DRGs are faithfully reproduced digital images of the
        original source maps.  Some differences may be detected
        between the source graphics used and the DRGs due to the RGB
        values assigned that particular color.  The intent is to
        re-create those colors as near as possible.  Data
        completeness for DRG files reflect content of the source
        graphics.  Features may have been eliminated or generalized
        on the source graphics due to scale and legibility
        constraints.  For information on collection and inclusion
        criteria, see U.S. Geological Survey, 1994, Standards for
        1:100,000-Scale Digital Line Graphs and Quadrangle Maps:
        National Mapping Program Technical Instructions and U.S.
        Geological Survey, 1994, Standards for Digital Line Graphs:
        National Mapping Program.
  Positional_Accuracy
    Horizontal_Positional_Accuracy
      Horizontal_Positional_Accuracy_Report:
        Approximate horizontal accuracy is 50 meters, assuming
        source data meets National Map Accuracy Standards.
    Vertical_Positional_Accuracy
      Vertical_Positional_Accuracy_Report:
        Vertical accuracy is approximately one-half of the mapped contour
        interval.
  Lineage
    Source_Information
      Source_Citation
        Citation_Information
          Originator:
            National Mapping Division
            U.S. Geological Survey
          Publication_Date:  1993
          Title:  Dearborn River 1:100,000 scale Quadrangle
          Geospatial_Data_Presentation_Form:  map
          Publication_Information
            Publication_Place:  Reston, VA
            Publisher:  U.S. Geological Survey
      Source_Scale_Denominator:  100000
      Type_of_Source_Media:  paper
      Source_Time_Period_of_Content
        Time_Period_Information
          Single_Date/Time
            Calendar_Date:  1993
        Source_Currentness_Reference:  Publication Date
      Source_Citation_Abbreviation:  D100
      Source_Contribution:
          The data set is an image of this source.
    Process_Step
      Process_Description:
        The production procedures, instrumentation, hardware, and software
        used in the collection of standard DRG products vary depending on
        systems used at the contract, cooperator or USGS production sites.
        The majority of DRG data sets are acquired through government
        contract.  The process step describes, in general, the process
        used in the production of standard DRG data sets.
 
        1. Production of a DRG begins with the scanning of a paper
        60x30-minute topographic map (map1) on a high-resolution scanner.
        Scanning resolutions range from 500 - 1000 dpi with the output
        file running between 160-300 mb.
 
        2. Removal of screens (descreening) and color quantization to reduce
        the number of colors also takes place during the scanning phase.
 
        3. The raw scan file is then transformed and georeferenced using UTM
        coordinates of the sixteen 2.5-minute grid ticks, which are obtained
        using the in-house produced program COORDAT and stored in a ground
        control file.  Those sixteen 2.5-minute ticks are interactively
        visited and assigned their respective UTM coordinates. USGS program
        XSHAPES4 then performs a piecewise linear rubber sheet
        transformation.
 
        4. An output resolution of 10.16 meters is chosen in order
        to resample the file to 250 dpi.
 
        5.  The image file is converted to a TIFF and further reduced by
        converting the file to a run length encoding Packbits
        compression(type 32773).
 
        6.  The color palette of the compressed DRG is then standardized by
        replacing the original RGB values assigned during the scanning
        process with standard RGB value combinations using the in-house
        produced TIFFREMAP program.
 
        7.  Prior to archiving the DRG undergoes the following quality
        assurance procedures:
 
        a. The color index values of each DRG are checked to ensure
        the RGB combinations are consistent with the standardized
        color palette.
 
        b. All DRG files are inspected to ensure that they are
        geometrically consistent with normal map presentation.
 
        c. Selected DRG's are checked to ensure that data elements in
        the DRG metadata file correspond to the map collar information
        and to the information in the associated image file.
 
        d. Selected DRG's are checked for georeferencing accuracy by
        comparing the book value of latitude and longitude tick marks
        with corresponding tick intersections in the DRG image.
 
        e. Transformations are checked on selected DRG's by comparing
        the positions of well defined points, such as UTM grid
        intersections in the graphic product, with the corresponding
        image points in the DRG.
 
        USGS DRG production specifications are available on request from
        the National Mapping Division and Mid-Continent Mapping Center by
        contacting:
 
        Rolla-ESIC
        U.S. Geological Survey
        1400 Independence Rd., MS231
        Rolla, MO 65401-2602
        Phone (573)308-3500
        Facsimile (573)308-3615
        E-mail to mcmcesic@usgs.gov
        World Wide Web: http://mcmcweb.er.usgs.gov/drg/
      Source_Used_Citation_Abbreviation:  D100
      Process_Date:  1996
      Source_Produced_Citation_Abbreviation:  D100B
    Process_Step
      Process_Description:
        The USGS DRG files were converted to Montana State Plane
        Coordinates at the Montana State Library using the Arc/Info
        GRIDWARP command, with 45 control points whose UTM and State
        Plane coordinates were determined with the Arc/Info PROJECT
        command.  The map collars were then clipped from the files.
      Source_Used_Citation_Abbreviation:  D100B
      Process_Date:  20000104
      Source_Produced_Citation_Abbreviation:  fin
 
Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method:  Raster
  Raster_Object_Information
    Raster_Object_Type:  Pixel
    Row_Count:     8000
    Column_Count:  5500
 
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition
    Planar
      Grid_Coordinate_System
        Grid_Coordinate_System_Name: State Plane Coordinate System 1983
        State_Plane_Coordinate_System
          SPCS_Zone_Identifier: 2500
          Lambert_Conformal_Conic
            Standard_Parallel:  45
            Standard_Parallel:  49
            Longitude_of_Central_Meridian:  -109.5
            Latitude_of_Projection_Origin:  44.25
            False_Easting:   600000
            False_Northing:  0
      Planar_Coordinate_Information
        Planar_Coordinate_Encoding_Method:  row and column
        Coordinate_Representation
          Abscissa_Resolution:  10.16
          Ordinate_Resolution:  10.16
        Planar_Distance_Units:  meters
    Geodetic_Model
      Horizontal_Datum_Name:  North American Datum of 1983
      Ellipsoid_Name:   Geodetic Reference System 80
      Semi-major_Axis:  6378137.0
      Denominator_of_Flattening_Ratio:  298.257
  Vertical_Coordinate_System_Definition
    Altitude_System_Definition
      Altitude_Datum_Name:  NGVD29
      Altitude_Resolution:  100
      Altitude_Distance_Units:  FEET
      Altitude_Encoding_Method:  Images of contours
 
 
Entity_and_Attribute_Information:
  Overview_Description
    Entity_and_Attribute_Overview:
      Each raster entity or pixel contains a color index from 0
      through 12 referencing a color palette of RGB values from
      0 through 255 in which the standard colors used in the DRG
      are defined.
 
      USGS DRG Color Palette
 
      Number    Color          Red      Green    Blue
      0         Black            0        0        0
      1         White          255      255      255
      2         Blue             0      151      164
      3         Red            203        0       23
      4         Brown          131       66       37
      5         Green          201      234      157
      6         Purple         137       51      128
      7         Yellow         255      234        0
      8         Light Blue     167      226      226
      9         Light Red      255      184      184
      10        Light Purple   218      179      214
      11        Light Grey     209      209      209
      12        Light Brown    207      164      142
    Entity_and_Attribute_Detail_Citation:
      Draft Standards for Digital Raster Graphic.
 
Distribution_Information:
  Distributor
    Contact_Information
      Contact_Organization_Primary
        Contact_Organization:  Montana State Library
        Contact_Person:        Gerry Daumiller
      Contact_Position:        Senior GIS Programmer
      Contact_Address
        Address_Type:  mailing address
        Address:            PO Box 201800
        City:               Helena
        State_or_Province:  Montana
        Postal_Code:        59620-1800
        Country:            USA
      Contact_Voice_Telephone:          (406) 444-5358
      Contact_Facsimile_Telephone:      (406) 444-0581
      Contact_Electronic_Mail_Address:  gdaumiller@state.mt.us
      Hours_of_Service:  Monday-Friday, 8-5, Mountain Time
  Distribution_Liability:
    Users must assume responsibility to determine the
    usability of this data for their purposes.
  Standard_Order_Process
    Non-digital_Form:
      Contact the State Library to see if the data is
      available as hardcopy maps.
    Fees:
      For-profit organizations must pay our costs to reproduce the
      data.  Fees can be waived if doing Government work.
  Standard_Order_Process
    Digital_Form
      Digital_Transfer_Information
        Format_Name:                  TIFF
        Format_Version_Number:        6.0
        File_Decompression_Technique: tar/gzip
      Digital_Transfer_Option
        Online_Option
          Computer_Contact_Information
            Network_Address
              Network_Resource_Name:  http://nris.state.mt.us/nsdi/drg.html
      Digital_Transfer_Option
        Offline_Option
          Offline_Media:     CD-ROM
          Recording_Format:  ISO 9660
    Fees:
      For-profit organizations must pay our costs to reproduce the
      data.  Fees can be waived if doing Government work.
 
Metadata_Reference_Information:
  Metadata_Date:  20000105
  Metadata_Review_Date:  20020307
  Metadata_Contact
    Contact_Information
      Contact_Organization_Primary
        Contact_Organization:  Montana State Library
        Contact_Person:        Gerry Daumiller
      Contact_Address
        Address_Type:  mailing address
        Address:            PO Box 201800
        City:               Helena
        State_or_Province:  Montana
        Postal_Code:        59620-1800
        Country:            USA
      Contact_Voice_Telephone:          (406) 444-5358
      Contact_Facsimile_Telephone:      (406) 444-0581
      Contact_Electronic_Mail_Address:  gdaumiller@state.mt.us
      Hours_of_Service:  Monday-Friday, 8-5, Mountain Time
  Metadata_Standard_Name:  FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version:  19940608
