Digital Raster Graphic: TETON VILLAGE , WY

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Frequently anticipated questions:

What does this data set describe?

Title: Digital Raster Graphic: TETON VILLAGE , WY
A digital raster graphic (DRG) is a scanned image of a U.S. Geological Survey (USGS) topographic map. The scanned image includes all map collar information. The image inside the map neatline is georeferenced to the surface of the Earth. The DRG can be used to collect, review, and revise other digital data especially digital line graphs (DLG). When the DRG is combined with other digital products, such as digital orthophoto quadrangles (DOQ) or digital elevation models (DEM), the resulting image provides additional visual information for the extraction and revision of base cartographic information. The USGS is producing DRGs of the 1:24,000-, 1:25,000-, 1:63,360- (Alaska), 1:100,000-, and 1:250,000-scale topographic map series.
Digital raster graphic (DRG) data on CD-ROM are being produced by the U.S. Geological Survey (USGS) through an Innovative Partnership agreement with The Land Information Technology Company Ltd. of Aurora, CO. This series includes DRG's of USGS standard series quadrangle maps of the United States, its Trusts, and Territories.
  1. How should this data set be cited?

    USGS Earth Resources Observation and Science Center (EROS), 19981101, Digital Raster Graphic: TETON VILLAGE , WY: USGS Digital Raster Graphics Digital Raster Graphics (DRGs) are scanned color images of USGS topographic maps., USGS Earth Resources Observation and Science Center (EROS), Sioux Falls.

    Online Links:

    Earth Science Information Centers (ESIC) offer nationwide information and sales service for USGS map products and earth science publications. For additional information, contact any USGS Earth Science Information Center (ESIC), or call 1-888-ASK-USGS.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -110.875
    East_Bounding_Coordinate: -110.75
    North_Bounding_Coordinate: 43.625
    South_Bounding_Coordinate: 43.5

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 18-Mar-1997
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: map

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following raster data types:

      • Dimensions, type Pixel

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      UTM_Zone_Number: 12
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -111.000
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0.0

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 2.438400000000
      Ordinates (y-coordinates) are specified to the nearest 2.438400000000
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.

  7. How does the data set describe geographic features?

    Each raster entity or pixel contains a digital number referencing a color palette of RGB values. Pixel resolution X is 2.4384 and pixel resolution Y is 2.4384
    Entity_and_Attribute_Detail_Citation: Standards for Digital Raster Graphic.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    U.S. Geological Survey Earth Resources Observation and Science (EROS) Center
    Attn: Customer Service Representative
    Customer Service
    U.S. Geological Survey
    Earth Resources Observation and Science (EROS) Center
    47914 252nd Street
    Sioux Falls, SD 57198-0001

    1-888-ASK-USGS (voice)

    Hours_of_Service: 0800 - 1600 CT, M-F, -6 h GMT
    Online Ordering: Once you have filled out and submitted the online ordering form found at <>, it is forwarded to Customer Services at the USGS National Center for Earth Resources Observation and Science (EROS) via the Earth Explorer system. EROS uses a secure credit card server that will encrypt your sensitive information and pass it from your browser to the EROS web server. Mail Ordering: First obtain the ordering information from Earth Explorer. Mail this information, along with your payment (check or purchase/money order), to USGS, EROS,

Why was the data set created?

The DRG is used for validating digital line graphs (DLGs) and for DLG data collection and revision. The DRG can help assess the completeness of digital data from other mapping agencies. It can also be used to produce "hybrid" products. These include combined DRGs and DOQs for revising and collecting digital data, DRGs and DEMs for creating shaded-relief DRGs and combinations of DRG, DOQ, and DLG data. Although a standard DRG is an effective mapping tool, its full potential for digital production is realized in combination with other digital data.

How was the data set created?

  1. From what previous works were the data drawn?

    USGS Topo (source 1 of 1)
    U.S. Geological Survey, 19981101, Digital Raster Graphic: TETON VILLAGE , WY.

    The source for DRGs are the standard quadrangle format USGS topographic maps as described in the Federal Geographic Data Committee "Manual of Federal Geographic Data Products". They include 1:20,000-, 1:24,000-, 1:25,000-, 1:30,000-, 1:63,360-, 1:100,000- and 1:250,000-scale topographic maps. Included in the 1:24,000- and 1:25,000-scale series are provisional (P) maps and color orthophotomaps.
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 24000
    The standard area of coverage of a DRG is the entire area printed on a USGS standard series topographic map including the map collar, any overedge areas, and insets. These standard series maps include: 7.5-minute map series: Conterminous United States, Hawaii, and limited areas of Alaska at 1:24,0000 and 1:25,000 scale. 7.5- by 15-minute map series: Covers limited areas of the conterminous United States at 1:25,000 scale. 30- by 60-minute map series: Conterminous United States

  2. How were the data generated, processed, and modified?

    Date: 06-Mar-1997 (process 1 of 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 500-1,000 dpi with an output file of 160-300 Mb in size. Removal of screens (descreening) and color quantization to reduce the number of colors also takes place during the scanning phase. 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. The USGS program XSHAPES4 then performs a piecewise linear rubber sheet transformation. An output resolution of 2.4 meters (8.2 feet) is chosen to resample the file to 250 dpi. The image file is converted to a TIFF 6.0 image and further reduced by converting the file to a run length encoded PackBits compression (type 32773). 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.

    Person who carried out this activity:

    Rolla-ESIC U.S. Geological Survey
    Customer Service Representative
    1400 Independence Rd., MS231
    Rolla, MO 65401-2602

    +001 573-308-3577 (voice)

    Contact_Instructions: <>
    Data sources used in this process:
    • map1

  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    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. How accurate are the geographic locations?

    A random sampling of DRGs is accuracy tested. The accuracy test is performed by comparing the positions of UTM grid intersections on the source graphic against the corresponding location on the digital image. A visual inspection determines whether those coordinates fall within the pixels that define a grid tick. DRGs duplicate the horzontal accuracy of its source.

  3. How accurate are the heights or depths?

    The vertical positional accuracy of a DRG is referenced in the DRG collar

  4. Where are the gaps in the data? What is missing?

    Image completeness is checked by visually inspecting a sampling of DRGs. Each selected DRG is examined for gaps (missing data) in the main body of the map, the map collar, the overedge areas, and any insets.

  5. How consistent are the relationships among the observations, including topology?

    The USGS DRG is produced with the intention of replicating as close as possible the original source map. Users of the DRG will note, however, that a certain amount of "noise" can be discerned when small areas are blown up or viewed under zoomed-in conditions. This noise is in the form of random specks or pixels of color and halos due to any number of factors, such as the quality of the source, the use of screens and patterns on the litho, and the unevenness of ink due to saturation and absorption. Discontinuities or breaks in linear features may also be present and are due to improper calibration or usage of the scanner, the condition of the source, and resampling. Descreening, quantizing, and noise filtering are methods used to reduce noise, which, besides creating a more aesthetically pleasing image, have the added benefit of reducing the size of the image file. Removal of lithographic screen patterns is preferred but not required.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Acknowledgement of the Geological Survey would be appreciated in products derived from these data.

  1. Who distributes the data set? (Distributor 1 of 1)

    U.S. Geological Survey Earth Resources Observation and Science (EROS) Center
    Attn: Customer Services Representative
    Customer Services, U.S. Geological Survey
    Earth Resources Observation and Science (EROS) Center
    47914 252nd Street
    Sioux Falls, SD 57198

    1-888-ASK-USGS (voice)

    Hours_of_Service: 0800 - 1600 CT, M-F, -6 h GMT
    Contact_Instructions: URL: <>
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    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.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    Adequate computer capability is the only technical prerequisite for viewing data in digital form.

Who wrote the metadata?

Last modified: 28-Oct-2000
Last Reviewed: 05-Dec-2011
Metadata author:
U.S. Geological Survey Earth Resources Observation and Science (EROS) Center
Archive Management
U.S. Geological Survey
Earth Resources Observation and Science (EROS) Center
47914 252nd Street
Sioux Falls, SD 57198-0001

1-888-ASK-USGS (voice)

Hours_of_Service: 0800 - 1600 CT, M-F, -6 h GMT
Metadata standard:
Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 Version 2.0 (FGDC-STD-001-1998, Version 2)

Generated by mp version 2.9.14 on Mon Dec 5 20:41:54 2011