Digital Orthophoto Quadrangle: DI00000000044769-TETON VILLAGE-NW,WY

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:


What does this data set describe?

Title:
Digital Orthophoto Quadrangle: DI00000000044769-TETON VILLAGE-NW,WY
Abstract:
Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquadrangle (DOQ) is a 1-meter ground resolution, quarter-quadrangle (3.75 minutes of latitude by 3.75 minutes of longitude) image cast on the Universal Transverse Mercator projection (UTM) on the North American Datum of 1983 (NAD83).The geographic extent of the DOQ is equivalent to a quarter-quadrangle plus the overedge ranges from a minimum of 50 meters to a maximum of 300 meters beyond the extremes of the primary and secondary corner points. The overedge is included to facilitate tonal matching for mosaicking and for the placement of the NAD83 and secondary datum corner ticks. The normal orientation of data is by lines (rows) and samples (columns). Each line contains a series of pixels ordered from west to east with the order of the lines from north to south. The radiometric image brightness values are stored as 256 gray levels, ranging from 0 to 255. The standard, uncompressed gray scale DOQ format contains an ASCII header followed by a series of 8-bit image data lines. The keyword-based, ASCII header may vary in the number of data entries. The header is affixed to the beginning of the image and is composed of strings of 80 characters with an asterisk (*) as character 79 and an invisible newline character as character 80. Each keyword string contains information for either identification, display, or registration of the image. Additional strings of blanks are added to the header so that the length of a header line equals the number of bytes in a line of image data. The header line will be equal in length to the length of an image line. If the sum of the byte count of the header is less than the sample count of one DOQ image line, then the remainder of the header is padded with the requisite number of 80 character blank entries, each terminated with an asterisk and newline character.
Supplemental_Information:
For further information on USGS Maps, see: <http://geography.usgs.gov/products.html#maps>
  1. How should this data set be cited?

    USGS Earth Resources Observation & Science (EROS) Center, 19970514, Digital Orthophoto Quadrangle: DI00000000044769-TETON VILLAGE-NW,WY: U.S. Geological Survey, Menlo Park, CA USA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -110.875
    East_Bounding_Coordinate: -110.8125
    North_Bounding_Coordinate: 43.625
    South_Bounding_Coordinate: 43.5625

  3. What does it look like?

    Browse graphic for: <http://edcsns17.cr.usgs.gov/browse/doq_qq/T/teton_village_WY/O4311026.NWS.44769.jpg> (JPEG)
    image

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

    Currentness_Reference: Ground condition

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

    Geospatial_Data_Presentation_Form: remote-sensing image

  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
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 19
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: .09996
      Longitude_of_Central_Meridian: -123 00 00
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 0
      False_Northing: 0

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 1
      Ordinates (y-coordinates) are specified to the nearest 1
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/297.257.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    Each pixel contains an 8-bit gray-scale value between 0 and 255 for DOQs from a panchromatic source. A value of 0 represents the color black, while a value of 255 represents the color white. All values between 0 and 255 are represented as a shade of gray, varying from black to white. For color-infrared and natural color DOQs, a digital number from 0 to 255 also will be asssigned to each pixel, but that number will refer to a color look-up table which will contain the red, green, and blue (RGB) values, each from 0 to 255, for that digital number. Areas where the rectification process is incomplete due to incomplete data (e.g., lack of elevation data, gaps), are represented with the numeric value of 0.
    Entity_and_Attribute_Detail_Citation:
    U.S. Department of the Interior, U.S. Geological Survey, guide for digital orthophotos: Reston, VA. A hypertext version is available at: <http://edc.usgs.gov/products/aerial/doq.html> U.S. Department of the Interior, U.S. Geological Survey, 1992, Standards for digital orthophotos: Reston, VA.
    Softcopies in ASCII, WordPerfect, and PostScript format are available at: <http://rockyweb.cr.usgs.gov/nmpstds/doqstds.html> /


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

    lta@usgs.gov

    Hours_of_Service: 0800 - 1600 CT, M-F
    Contact_Instructions:
    Online Ordering: Once you have filled out and submitted the online ordering form found at <http://earthexplorer.usgs.gov>, 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 money order), to USGS, Earth Resources Observation & Science (EROS) Center, 47914 252nd Street, Sioux Falls SD 57198-0001


Why was the data set created?

DOQs serve a variety of purposes, from interim maps to field references for Earth science investigations and analysis. The DOQ is useful as a layer of a geographic information system and as a tool for revision of digital line graphs and topographic maps.


How was the data set created?

  1. From what previous works were the data drawn?

    DEM1 (source 1 of 4)
    U.S. Geological Survey, UNKNOWN, 265717: U.S. Geological Survey, Menlo Park, CA USA.

    Type_of_Source_Media: cartridge tape
    Source_Contribution:
    Elevation data in the form of an ortho-DEM regridded to user-specified intervals and bounds.

    PHOTO1 (source 2 of 4)
    U.S. Geological Survey, Unknown, NAPP 7824 159: U.S. Geological Survey, Menlo Park, CA USA.

    Type_of_Source_Media: cartridge tape
    Source_Scale_Denominator: 40000
    Source_Contribution:
    Panchromatic black and white (or color infrared) NAPP or NAPP-like photograph. The NAPP photographs are centered on the DOQ coverage area.

    CONTROL_INPUT (source 3 of 4)
    U.S. Geological Survey, Unpublished material, project ground and photo control: U.S. Geological Survey, Menlo Park, CA USA.

    Type_of_Source_Media: Various media
    Source_Contribution:
    Horizontal and vertical control used to establish positions and elevations for reference and correlation purposes.

    CAMERA_INPUT (source 4 of 4)
    U.S. Geological Survey, Unpublished material, Report of calibration: U.S. Geological Survey, Menlo Park, CA USA.

    Type_of_Source_Media: disc, paper
    Source_Contribution: camera calibration parameters

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

    Date: UNKNOWN (process 1 of 1)
    To produce a DOQ requires (1) a minimum of three ground positions that can be identified on the photograph to be rectified, (2) camera calibration parameters, such as the calibrated focal length and the coordinates of the camera fiducials, (3) a digital elevation model (DEM), and (4) a digital image produced by scanning an aerial photograph with a precise, high-resolution scanner.The digital image is rectified to generate an orthophoto by processing requirements 1 through 3 above for each image picture element (pixel), using rigorous photogrammetric equations on a computer. The finished product is a spatially accurate image with planimetric features represented in their true geographic positions.

    Data sources used in this process:

    • NAPP

  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?

    During photographic reproduction of the source photography, limited analog dodging is performed to improve image quality. Analog dodging consists of holding back light from certain areas of the sensitized photographic material to avoid overexposure. The diapositive is inspected to insure clarity and radiometric uniformity. Diapositive image brightness values are collected with a minimum of image quality manipulation. Image brightness values may deviate from brightness values of the original imagery due to image value interpolation during the scanning and rectification processes. Radiometry is verified by visually inspecting the DOQs to the original unrectified image to determine if the DOQ has the same image quality or better image quality than the original unrectified input image. Slight systematic and radiometric differences can be detected between adjacent DOQ files due primarily to differences in source photography capture dates and Sun angles of aerial photography along flight lines. These differences can be observed in an image's general lightness or darkness when compared to adjacent DOQ file coverages.

  2. How accurate are the geographic locations?

    The DOQ horizontal positional accuracy and the assurance of that accuracy depend, in part, on the accuracy of the data inputs to the rectification process. These inputs consist of the digital elevation model (DEM), aerotriangulation control and methods, the photo source camera calibration, scanner calibration, and aerial photographs that meet National Aerial Photography Program (NAPP) standards. Field control is acquired by third order class 1 or better survey methods sufficiently spaced to meet National Map Accuracy Standards for 1:12,000-scale products. Aerial cameras have current certification from the USGS, National Mapping Division, Optical Science Laboratory. Test calibration scans are performed on all source photography scanners.

  3. How accurate are the heights or depths?

    The vertical accuracy of the verified USGS format DEM is equivalent to or better than a USGS level-1 or -2 DEM.

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

    All DOQ images are visually inspected for completeness to ensure that no gaps or image misplacement exists in the image area or in overedge coverage. The DOQ images may be derived by mosaicking multiple images, in order to insure complete coverage. All DOQs are cloud free. Some clouds may, very infrequently, be encountered only in the overedge coverage. Source photography is leaf-off in deciduous vegetation regions. Void areas may exist, having a radiometric value of zero and appearing black. These voids are areas for which no photographic source is available or are the result of image transformation from other planimetric systems to the UTM projection. In the latter case, the void sliver areas are on the outside edges of the overedge area. The data set field content of each DOQ header record element is validated to assure completeness prior to archiving in the Sales Data Base.

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

    All DOQ header data and image file sizes are validated by Tape Validation System (TVS) software prior to archiving in the Sales Data Base. This validation procedure assures correct physical format and field values for header record elements. Logical relationships between header record elements are tested.


How can someone get a copy of the data set?

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

Access_Constraints: none
Use_Constraints:
None. Acknowledgement of the U.S. Geological Survey is 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
    Customer Services, U.S. Geological Survey
    Earth Resources Observation and Science (EROS) Center
    47914 252nd Street
    Sioux Falls, SD 57198-0001
    USA

    703 648 4543 (voice)
    lta@usgs.gov

    Hours_of_Service: 0800 - 1600 CT, M-F
  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?

Dates:
Last modified: 01-Aug-2000
Last Reviewed: 01-Mar-2005
Metadata author:
U.S. Geological Survey
Earth Resources Observation and Science (EROS) Center
47914 252nd Street
Sioux Falls, SD 57198
USA

703 648 4543 (voice)
lta@usgs.gov

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


Generated by mp version 2.9.14 on Wed Mar 21 11:13:56 2012