National Aerial Photography Program (NAPP) Data Dictionary
The Data Dictionaries are a set of information describing the contents, format, and structure of elements for EarthExplorer products.
- Field Definition: The acquisition date refers to the date the image was acquired.
Format:
YYYY/MM/DD
YYYY = Year
MM = Month
DD = Day
- Field Definition: NAPP photography was flown to provide stereo-graphic coverage. The photographs were arranged to overlap along the direction of the flight lines, so each photograph centered on a station has 60 percent overlap with the adjacent photographs to the south and north. You may select full coverage of an area and eliminate the overlapping photographs by requesting either odd or even station numbers.
- Field Definition: The precise distance measured along the lens axis from the rear nodal point to the imaging surface plane in millimeters.
- Field Definition: The number assigned to an aerial photographic device composed of a lightproof enclosure having an aperture with a shuttered lens through which the image of an object is focused and recorded on a photosensitive film or plate.
- 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
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
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
- Field Definition: This field is used to identify the county in in which the photograph was acquired.
- Field Definition: This field is used to identify data by assigning a unique series of letters and numbers to an image.
Format:
DDPPPPPPRRRRRFFF
DD = Data set Identifier (N1 for black & white, NP for color infrared)
PPPPPP = Project
RRRRR = Roll Number*
FFF = Frame Number*
* Depending upon the entity ID, some of the information may be preceded by zero-filled spaces.
- Field Definition: The type of film used for aerial mapping and interpretation included black-and-white and color infrared. Black-and-white (B&W) panchromatic film is sensitive to the full visible portion of the electromagnetic spectrum of light and captures images in tones of gray ranging from black to white. Color infrared (CIR), or false color, film is sensitive to green and red in the visible portion of spectrum of light and extends into the near-infrared region of the spectrum. CIR photography utilizes high speed film that is subject to degradation prior to processing, which can create an overall blue cast to the image.
Valid Codes:
B&W = Black-and-White
CIR = Color Infrared
- Field Definition: Flight Line and Station numbers indicate the positions upon which NAPP photographs are centered. These positions are based on specific locations within the boundaries of the associated 7.5-minute quadrangle (quad). Basically, the flight line number consists of a longitude degree coordinate, the position of the associated 7.5-minute quad, and "E" or "W" which indicates whether the flight line is to the east or west of the center of the quad.
Format:
099 = Longitude degree coordinate
8 = Location of the quad in relation to the positions of the eight quads in a degree of longitude.
W = Indicates whether the flight line is to the east or west of the center of the quad.
Example:
0998W
- Field Definition: A number that indicates an image position 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 at 25 microns (1,000 dpi), 14 microns (1,800 dpi), or 7 microns (3,600 dpi).
- Field Definition: The identification number assigned to the lens that was used to acquire the photographs.
- Field Definition: Name used to uniquely identify a project.
Values:
NAPP = CIR film
NAPPA = Duplicate B/W film, covering limited area
NAPPW = B/W film
- Field Definition: This field is used to identify the project number, which consist of the contract year and the sequential number of the contracted area.
- Field Definition: This field is used to identify the state in which the photograph was taken.
- Field Definition: The number assigned to a roll of film.
- Field Definition: This field is used to identify the state in which the photograph was taken.
- Field Definition: Station is a number relative to the flight line. It occupies a specific position within the 7.5-minute quadrangle(s) ascending to the north beginning with the lowest latitude of the U.S., meaning the lowest numbers would be in Florida and the highest numbers would be in Maine.
Values:
Station Number: 509
The Data Dictionaries are a set of information describing the contents, format, and structure of elements for EarthExplorer products.
- Field Definition: The acquisition date refers to the date the image was acquired.
Format:
YYYY/MM/DD
YYYY = Year
MM = Month
DD = Day
- Field Definition: NAPP photography was flown to provide stereo-graphic coverage. The photographs were arranged to overlap along the direction of the flight lines, so each photograph centered on a station has 60 percent overlap with the adjacent photographs to the south and north. You may select full coverage of an area and eliminate the overlapping photographs by requesting either odd or even station numbers.
- Field Definition: The precise distance measured along the lens axis from the rear nodal point to the imaging surface plane in millimeters.
- Field Definition: The number assigned to an aerial photographic device composed of a lightproof enclosure having an aperture with a shuttered lens through which the image of an object is focused and recorded on a photosensitive film or plate.
- 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
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
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
- Field Definition: This field is used to identify the county in in which the photograph was acquired.
- Field Definition: This field is used to identify data by assigning a unique series of letters and numbers to an image.
Format:
DDPPPPPPRRRRRFFF
DD = Data set Identifier (N1 for black & white, NP for color infrared)
PPPPPP = Project
RRRRR = Roll Number*
FFF = Frame Number*
* Depending upon the entity ID, some of the information may be preceded by zero-filled spaces.
- Field Definition: The type of film used for aerial mapping and interpretation included black-and-white and color infrared. Black-and-white (B&W) panchromatic film is sensitive to the full visible portion of the electromagnetic spectrum of light and captures images in tones of gray ranging from black to white. Color infrared (CIR), or false color, film is sensitive to green and red in the visible portion of spectrum of light and extends into the near-infrared region of the spectrum. CIR photography utilizes high speed film that is subject to degradation prior to processing, which can create an overall blue cast to the image.
Valid Codes:
B&W = Black-and-White
CIR = Color Infrared
- Field Definition: Flight Line and Station numbers indicate the positions upon which NAPP photographs are centered. These positions are based on specific locations within the boundaries of the associated 7.5-minute quadrangle (quad). Basically, the flight line number consists of a longitude degree coordinate, the position of the associated 7.5-minute quad, and "E" or "W" which indicates whether the flight line is to the east or west of the center of the quad.
Format:
099 = Longitude degree coordinate
8 = Location of the quad in relation to the positions of the eight quads in a degree of longitude.
W = Indicates whether the flight line is to the east or west of the center of the quad.
Example:
0998W
- Field Definition: A number that indicates an image position 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 at 25 microns (1,000 dpi), 14 microns (1,800 dpi), or 7 microns (3,600 dpi).
- Field Definition: The identification number assigned to the lens that was used to acquire the photographs.
- Field Definition: Name used to uniquely identify a project.
Values:
NAPP = CIR film
NAPPA = Duplicate B/W film, covering limited area
NAPPW = B/W film
- Field Definition: This field is used to identify the project number, which consist of the contract year and the sequential number of the contracted area.
- Field Definition: This field is used to identify the state in which the photograph was taken.
- Field Definition: The number assigned to a roll of film.
- Field Definition: This field is used to identify the state in which the photograph was taken.
- Field Definition: Station is a number relative to the flight line. It occupies a specific position within the 7.5-minute quadrangle(s) ascending to the north beginning with the lowest latitude of the U.S., meaning the lowest numbers would be in Florida and the highest numbers would be in Maine.
Values:
Station Number: 509