Digital Raster Graphic - Metadata

--Identification Information--

-Citation-

8.1       ORIGINATOR: USGS

8.2       PUBLICATION DATE:  19971017

8.4       TITLE:  Big Dry School

8.6       GEOSPATIAL DATA PRESENTATION FORM:  "map"


-Publication Information-

8.8.1     PUBLICATION PLACE:  Reston, VA

8.8.2     PUBLISHER:  USGS


-Description-


1.2.1     ABSTRACT:  The Digital Raster Graphic (DRG) is a raster image of a
          scanned USGS topographic map including the collar information,
          georeferenced to the UTM grid.

1.2.2     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.  DRG's
          can also be merged with other digital data, e.g. DEM's or DOQ's, to
          produce a hybrid digital file.

1.2.3     SUPPLEMENTAL INFORMATION:  328368.574128594540, 5236124.032438975750


-Time period of content-

  Single Date/Time

9.1.1     CALENDAR DATE:  19971017

1.3.1     CURRENTNESS REFERENCE:  "Ground Condition"


-Status-

1.4.1     PROGRESS:  "Complete"

1.4.2     MAINTENANCE AND UPDATE FREQUENCY:  "Irregular"


-Spatial Domain-

  Bounding Coordinates

1.5.1.1   WEST BOUNDING COORDINATE:  -107.250000

1.5.1.2   EAST BOUNDING COORDINATE:  -107.125000

1.5.1.3   NORTH BOUNDING COORDINATE:  47.250000

1.5.1.4   SOUTH BOUNDING COORDINATE:  47.125000


-Keywords-

  Theme

1.6.1.1   THEME KEYWORD THESAURUS:  "None"

1.6.1.2   THEME KEYWORD:  digital raster graphic

1.6.1.2   THEME KEYWORD:  DRG

1.6.1.2   THEME KEYWORD: topographic map

  Place

1.6.2.1   PLACE KEYWORD THESAURUS: Department of Commerce, 1977, Countries,
          Dependencies, Areas of Special Sovereignty, and their Principal
          Administrative Divisions (Federal Information Processing Standard
          10-3): Washington, Department of Commerce, National Institute of
          Standards and Technology.

1.6.2.2   PLACE KEYWORD:  US

1.6.2.1   PLACE KEYWORD THESAURUS:  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, Department of
          Commerce, National Institute of Standards and Technology.

1.6.2.2   PLACE KEYWORD:  MT

1.6.2.2   PLACE KEYWORD:  

1.6.2.2   PLACE KEYWORD:  

1.6.2.2   PLACE KEYWORD:  

1.7       ACCESS CONSTRAINTS:  "None"

1.8       USE CONSTRAINTS:  Acknowledgment of the USGS would be appreciated in
          products derived from these data.

1.11      DATA SET CREDIT:  This DRG was produced through an Innovative
          Partnership agreement between The Land Information Technology
          Company, Ltd., of Aurora, CO and the USGS.



--Data Quality Information--

-Attribute Accuracy-

2.1  ATTRIBUTE ACCURACY REPORT:  The DRG is an 8-bit color image that employs
     a color palette to ensure uniform colors throughout a particular DRG
     series.  All DRG's within a series must have the same RGB value.

2.2  LOGICAL CONSISTENCY REPORT:  Not Applicable

2.3  COMPLETENESS REPORT:  The DRG is a faithfully reproduced digital image of
     the original source map.  Some differences may be detected between the
     source graphic used and the DRG due to the RGB values assigned that
     particular color.  The intent is to recreate those colors as near as
     possible.  Data completeness for DRG files reflect content of the source
     graphic.  Features may have been eliminated or generalized on the source
     graphic due to scale and legibility constraints.  For information on
     collection and inclusion criteria, see U.S. Geological Survey, 1994,
     Standards for 1:24,000-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
     Technical Instructions.


-Positional Accuracy-

  Horizontal Positional Accuracy

2.4.1.1   HORIZONTAL POSITIONAL ACCURACY REPORT:  While the datum of the
          published map is retained to be consistent with other USGS digital
          data, this image is cast on the UTM and may be INCONSISTENT with the
          credit note on the image collar.

  Vertical Positional Accuracy

2.4.2.2   VERTICAL POSITIONAL ACCURACY REPORT:  Refer to the DRG collar for
          information about vertical positional accuracy.

-Lineage-

  Source Information

     Source Citation

2.5.1.5   SOURCE CITATION ABBREVIATION:  map1

8.1       ORIGINATOR:  USGS

8.2       PUBLICATION DATE:  1965

8.4       TITLE:  Big Dry School

8.6       GEOSPATIAL DATA PRESENTATION FORM:  "map"



--Publication Information--

8.8.1     PUBLICATION PLACE:  Reston, VA

8.8.2     PUBLISHER:  USGS

2.5.1.2   SOURCE SCALE DENOMINATOR:  24000

2.5.1.3   TYPE OF SOURCE MEDIA:  "paper"

-Source Time Period of Content-

  Single Date/Time

9.1.1     CALENDAR_DATE:  1965

2.5.1.4.1 SOURCE CURRENTNESS REFERENCE:  "ground condition"

2.5.1.6   SOURCE CONTRIBUTION:  The source map is scanned to produce the DRG.


-Process Step-

2.5.2.1   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
          7.5-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 2.4 meters (8.2 feet) 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/


2.5.2.2   SOURCE USED CITATION ABBREVIATION:  map1


2.5.2.3   PROCESS DATE:  19971017



--Spatial Data Organization Information--


3.2       DIRECT SPATIAL REFERENCE METHOD:  "Raster"

-Raster Object Information-

3.4.1     RASTER OBJECT TYPE:  "Pixel"

3.4.2     ROW COUNT:  6924

3.4.3     COLUMN COUNT:  4823



--Spatial Reference Information--

-Horizontal Coordinate System Definition-

  Planar

4.1.2.2.1 GRID COORDINATE SYSTEM NAME:  "Universal Transverse Mercator"

  Universal Transverse Mercator (UTM)

4.1.2.2.2.1    UTM ZONE NUMBER:  13

  Transverse Mercator

4.1.2.1.2.17   SCALE FACTOR AT CENTRAL MERIDIAN:  0.9996

4.1.2.1.2.2    LONGITUDE AT CENTRAL MERIDIAN:  -105.000

4.1.2.1.2.3    LATITUDE OF PROJECTION ORIGIN:  0.0

4.1.2.1.2.4    FALSE EASTING:  500000.

4.1.2.1.2.5    FALSE NORTHING:  0.0



--Planar Coordinate Information--

4.1.2.4.1 PLANAR COORDINATE ENCODING METHOD:  "row and column"

-Coordinate Representation-

4.1.2.4.2.1    ABSCISSA RESOLUTION:  2.438400000000

4.1.2.4.2.2    ORDINATE RESOLUTION:  -2.438400000000

4.1.2.4.4 PLANAR DISTANCE UNITS:  "meters"


-Geodetic Model-

4.1.4.1   HORIZONTAL DATUM NAME:  North American Datum 1927

4.1.4.2   ELLIPSOID NAME:  Clarke 1866

4.1.4.3   SEMI-MAJOR AXIS:  6378206.4

4.1.4.4   DENOMINATOR OF FLATTENING RATIO:  294.98



--Entity and Attribute Information--

-Overview Description-

5.2.1     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

            Digital 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


5.2.2     ENTITY AND ATTRIBUTE DETAIL CITATION: Draft Standards for Digital
          Raster Graphic.



--Distribution Information--

-Distributor-

  Contact Organization Primary

10.1.2    CONTACT ORGANIZATION:  Earth Science Information Center,  U.S.
          Geological Survey Contact Address

10.4.1    ADDRESS TYPE:  "mailing address"

10.4.2    ADDRESS:  507 National Center

10.4.3    CITY:  Reston

10.4.4    STATE OR PROVINCE:  Virginia

10.4.5    POSTAL CODE:  22092

10.5      CONTACT VOICE TELEPHONE:  1 800 USA MAPS

10.5      CONTACT VOICE TELEPHONE:  1 703 648 6045

6.3       DISTRIBUTION LIABILITY:  Although these data have been processed
          successfully on a computer system at the USGS, no warranty expressed
          or implied is made by the USGS regarding the use of the data on any
          other system, nor does the act of distribution constitute any such
          warranty. The USGS 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 days from the date of this shipment from the
          ordering site.

-Standard Order Process-

  Digital Form

     Digital Transfer Information

6.4.2.1.1 FORMAT NAME:  TIFF

6.4.2.1.2 FORMAT VERSION NUMBER:  6.0

6.4.2.1.6 FILE DECOMPRESSION TECHNIQUE:  Packbits

  Digital Transfer Option

     Offline Options

6.4.2.2.2.1    OFFLINE MEDIA:  "CD-ROM"

6.4.2.2.2.3    RECORDING FORMAT:  "ISO 9660";  DRG image files with
               corresponding metadata files.

6.4.3     FEES:  For delivery on CD-ROM, the charge is $32 per CD-ROM



--Metadata Reference Information--

7.1       METADATA DATE:  19971017

  Metadata Contact

     Contact Organization Primary

10.1.2    CONTACT ORGANIZATION:  U.S. Geological Survey

  Contact Address

10.4.1    ADDRESS TYPE:  "mailing address"

10.4.2    ADDRESS:  590 National Center

10.4.3    CITY:  Reston

10.4.4    STATE OR PROVINCE:  Virginia

10.4.5    POSTAL CODE:  22092

10.5      CONTACT VOICE TELEPHONE:  1 703 648 4533

10.8      CONTACT ELECTRONIC MAIL ADDRESS: Copies of this publication are
          available from anonymous File Transfer Protocol (anonymous FTP);
          ftp://fgdc.er.usgs.gov/

7.5       METADATA STANDARD NAME:  "Content Standards for Digital Geospatial
          Metadata"

7.6       METADATA STANDARD VERSION:  19940608

