Aerial Photo Single Frames Data Dictionary

 

 

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.

Camera Calibration

Field Definition: report certified by USGS on aerial cameras used by commercial contractors to acquire acceptable photography to complete contracted flights. These cameras are certified ever five years and the reports include: Calibrated Focal Length; Lens Distortion; Lens Resolving Power; Filter Parallelism; Shutter Calibration; Magazine Platen; Principle Point & Fiducial Mark and Distances Between Fiducial Marks

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

 

Data Entered

Field Definition:  Date when record was added.

 

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.