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    Aerial Photo Single Frames Data Dictionary

    • Acquisition Date
    • Agency
    • Browse Availability
    • Cloud Cover
    • Coordinates - Decimal Degrees
    • Coordinates - Degrees, Minutes, Seconds
    • Entity ID
    • Event
    • Film Length and Width
    • Flying Height
    • Focal Length
    • Frame Number
    • High Resolution Download Available
    • Image Type
    • Other
    • Photo ID
    • Project
    • Quality
    • Recording Technique
    • Roll Number
    • Scale
    • Sensor
    • Stereo Overlap
    • Strip Number
    • Vendor ID
    Acquisition Date
    • Field Definition:  The acquisition date refers to the year, month, and day the photography was acquired.
    Format:
    YYYY/MM/DD
    YYYY = Year
    MM = Month
    DD = Day
    Agency
    • Field Definition:  The name of the agency that acquired the photography and the EROS code associated with the agency.
    Values:
    1 = U.S. Geological Survey
    2 = U.S. Bureau of Reclamation
    4 = U.S. Bureau of Land Management
    5 = NASA AMES Research Center
    6 = NASA Johnson Space Center
    A = Army Map Service
    B = U.S. Air Force
    C = U.S. Navy
    D = NASA-Wallops Island
    E = South Dakota State University
    F = NASA Kennedy Space Center
    H = EROS Miscellaneous
    I = NASA Stennis Space Center
    J = Federal Emergency Management Agency (FEMA)
    L = National Park Service
    M = McDonnell/Douglas
    N = U.S. Corps of Engineers
    P = EROS Acquired
    R = NASA Marshall Space Flight Center
    U = Urban Area Photography
    Z = Hazards-Hurricane Mitch

    Note: The codes associated with the agency are used in the photo and entity Identifiers.
    Browse Availability
    • Field Definition:  This flag identifies whether the entity has a browse image available. A browse image provides the user with a visual overview of an inventory item.

      Note: Preview images are resampled from the original data and may not accurately represent the full resolution product.
    Cloud Cover
    • Field Definition:  The percent of the frame that is obscured by clouds.
    Values:
    0 = 0 to 9 percent cloud cover
    1 = 10 to 19 percent cloud cover
    2 = 20 to 29 percent cloud cover
    3 = 30 to 39 percent cloud cover
    4 = 40 to 49 percent cloud cover
    5 = 50 to 59 percent cloud cover
    6 = 60 to 69 percent cloud cover
    7 = 70 to 79 percent cloud cover
    8 = 80 to 89 percent cloud cover
    9 = 90 to 100 percent cloud cover
    Coordinates - Decimal Degrees
    • Field Definition:  The latitude and longitude are provided in decimal degrees for the following fields:
    Values:
    Scene Center Latitude and Longitude
    Northeast (NE) Corner Latitude and Longitude
    Northwest (NW) Corner Latitude and Longitude
    Southeast (SE) Corner Latitude and Longitude
    Southwest (SW) Corner Latitude and Longitude

    Latitude Format Decimal Degrees: -90.000 through 90.000
    Longitude Format Decimal Degrees: -180.000 through 180.000

    Number of decimal places will vary by dataset – check collection in EE.
    Coordinates - Degrees, Minutes, Seconds
    • Field Definition:  The latitude and longitude are provided in degrees, minutes, and seconds for the following fields:
    Values:
    Scene Center Latitude and Longitude
    Northeast (NE) Corner Latitude and Longitude
    Northwest (NW) Corner Latitude and Longitude
    Southeast (SE) Corner Latitude and Longitude
    Southwest (SW) Corner Latitude and Longitude

    Latitude Format:
    DDMMSS.SSH
    DD = Degree(s) with a range of 0 through 90
    MM = Minutes(s) with a range of 0 through 59
    SS.SS = Second(s) with a range of 0 through 59.99
    H = Hemisphere with N for north and S for south

    Longitude Format:
    DDDMMSS.SSH
    DDD = Degree(s) with a range of 0 through 180
    MM = Minute(s) with a range of 0 through 59
    SS.SS = Second(s) with a range of 0 through 59.99
    H = Hemisphere with E for east and W for west
    Entity ID
    • Field Definition:  The Entity ID consist of a two digit data set designator and the Photo ID. The unique accession photo id, developed for each agency, allows identification within the EROS database that is comparable with the agency's original identification.
    Format:
    DDAPPPPPRRRFFFF
    DD = Data set designator (AR)
    A = Agency
    P = Project
    R = Roll
    F = Frame
    Example:
    AR5750022260121
    Event
    • Field Definition:  This field indicates if any specific events are associated with the imagery.
    Film Length and Width
    • Field Definition:  The length and width of image frame contained on the roll of film.
    Values:
    Conversion: 1 inch = 25.4 millimeters
    Conversion Chart:
    .63 inches = 16mm
    1.37 inches = 35mm
    2.25 inches = 57mm
    5.00 inches = 127mm
    7.00 inches = 178mm
    9.00 inches = 229mm
    18.0 inches = 457mm
    38.0 inches = 965mm
    50.0 inches = 1270mm
    60.0 inches = 1524mm
    Flying Height
    • Field Definition:  The flying height above ground level, in feet, at which the frame was acquired.
    Focal Length
    • Field Definition:  The focal length, in millimeters, of the sensor used to record the images on the film source. Conversion: 1 inch = 25.4 millimeters.
    Frame Number
    • Field Definition:  The number assigned to a photographic frame on a roll of film.
    High Resolution Download Available
    • Field Definition:  This field indicates if a high resolution download is currently available for the product. Standard high resolution products are at a resolution of 25 microns or 1,000 dots per inch (dpi). Medium resolution products are at a resolution of 63 microns or 400 dpi.

      Note: EarthExplorer will have a shopping basket icon on the results page for images that are available for on-demand scanning. On-demand scanning options for black and white images include 25 microns (1,000 dpi), 14 microns (1,800 dpi), or 7 microns (3,600 dpi). On-demand scanning options for color images include 25 microns (1,000 dpi) or 14 microns (1,800 dpi). Color images are limited to 14-micron due to file size.
    Image Type
    • Field Definition:  The image type resulting from the film type used.
    Values:
    12 = Black & White Infrared
    13 = Color Infrared
    14 = Color
    24 = Black & White

    Note: Images are captured as they appear on film and are representative of the full tonal range of the original film source. Images from color negative film are typically available as positive images, however, there are some medium resolution images that may need to be inverted.
    Other
    • Field Definition:  This field indicates if there are any other pertinent details associated with the imagery.
    Photo ID
    • Field Definition:  The unique accession photo id, developed for each agency, allows identification within the EROS Data Base that is comparable with the agency's original identification.
    Format:
    APPPPPRRRFFFF
    A = Agency
    P = Project
    R = Roll
    F = Frame
    Example:
    5750022260121
    Project
    • Field Definition:  The project assigned to this image.
    Quality
    • Field Definition:  A rating of the overall image quality of the frame.
    Values:
    0 = Very poor
    2 = Poor
    5 = Fair
    8 = Good to Excellent
    NULL = No quality assigned
    Recording Technique
    • Field Definition:  The recording technique used in acquiring the image frame.
    Values:
    1 = Vertical Cartographic
    2 = Vertical Reconnaissance
    16 = Low Oblique
    17 = High Oblique
    Roll Number
    • Field Definition:  The number assigned to the film roll.
    Scale
    • Field Definition:  The scale of the image is the ratio of the distance on the image compared to the equivalent distance on the ground.
    Sensor
    • Field Definition:  The type of camera used to acquire the imagery.
    Stereo Overlap
    • Field Definition:  Amount of image (stereo) overlap in ten percent increments.
    Values:
    0 = None
    1 = 10%
    2 = 20%
    3 = 30%
    4 = 40%
    5 = 50%
    6 = 60%
    7 = 70%
    8 = 80%
    9 = 90%
    Strip Number
    • Field Definition:  Strips were often important keys in creating line indexes for a film project. USGS/EROS has migrated to single frame metadata records rather than relying on historical photo indexes and map-line plots.
    Vendor ID
    • Field Definition:  The name of the file supplied by the vendor.
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