NAIP Digital Georectified Image

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Frequently-anticipated questions:

What does this data set describe?

Title: NAIP Digital Georectified Image
This data set contains imagery from the National Agricultural Imagery Program (NAIP). NAIP acquires digital ortho imagery during the agricultural growing seasons in the continental U.S.. A primary goal of the NAIP program is to enable availabilty of ortho imagery within a year of acquisition. NAIP provides two main products: 1 meter ground sample distance (GSD) ortho imagery rectified to a horizontal accuracy of within +/- 3 meters of reference digital ortho quarter quads (DOQQS) from the National Digital Ortho Program (NDOP); and, 2 meter GSD ortho imagery rectified to within +/- 20 meters of reference DOQQs. The tiling format of NAIP imagery is based on a 3.75' x 3.75' quarter quadrangle with a 360 meter buffer on all four sides. NAIP quarter quads are rectified to the UTM coordinate system NAD83. NAIP imagery can obtain as much as 10% cloud cover per tile.
  1. How should this data set be cited?

    USDA-FSA-APFO Aerial Photography Field Office, 20050307, NAIP Digital Georectified Image: USDA_FSA_APFO Aerial Photography Field Office, Salt Lake City, Utah.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -89.3125
    East_Bounding_Coordinate: -89.2500
    North_Bounding_Coordinate: 37.0000
    South_Bounding_Coordinate: 36.9375

  3. What does it look like?

    None (None)

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

    Calendar_Date: 07-Aug-2004
    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?

      Indirect_Spatial_Reference: Alexander County, IL
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 3837 x 3169, type Pixel

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      UTM_Zone_Number: 16
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -87.0
      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
      Ordinates (y-coordinates) are specified to the nearest 2
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80 (GRS 80).
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257.

  7. How does the data set describe geographic features?

    24-bit pixels, 3 band color(RGB) values 0 - 255
    Entity_and_Attribute_Detail_Citation: None

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?

    Aerial Photography Field Office (APFO)
    2222 West 2300 South
    Salt Lake City, Utah 84119-2020

    801-975-3503 (voice)
    801-975-3532 (FAX)

Why was the data set created?

The 2 meter GSD NAIP is intended as a source for current digital imagery in USDA Field Service Center GIS and for other programs that require imagery acquired during the agricultural growing season where high horizontal accuracy is not required.

How was the data set created?

  1. From what previous works were the data drawn?

    Georectifed Image (source 1 of 1)
    USDA-FSA-APFO Aerial Photography Field Office, 20050307, Charleston, NE.

    Type_of_Source_Media: DLT
    Source_Contribution: Digital Georectifed Image.

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

    Date: 07-Mar-2005 (process 1 of 1)

  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?

  2. How accurate are the geographic locations?

    The positional accuracy for the digital data is tested by visual comparison to a data source with a higher order of accuracy.

  3. How accurate are the heights or depths?

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


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

    NAIP 3.75 minute tile file names are based on the USGS quadrangle naming convention.

How can someone get a copy of the data set?

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

Access_Constraints: There are no limitations for access.
None, The Aerial Photography Field Office asks to be credited in derived products.

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

    Supervisor Sales Services Branch
    USDA-FSA-APFO Aerial Photography Field Office
    2222 West 2300 South
    Salt Lake City, Utah 84119-2020

    801-975-3503 (voice)
    801-975-3532 (FAX)

  2. What's the catalog number I need to order this data set?


  3. What legal disclaimers am I supposed to read?

    In no event shall the creators, custodians, or distributors of this information be liable for any damages arising out of its use ( or the inability to use it).

  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 07-Mar-2005
Metadata author:
USDA-FSA-APFO Aerial Photography Field Office
2222 West 2300 South
Salt Lake City, Utah 84119-2020

801-975-3503 (voice)

Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Illinois Natural Resources Geospatial Data Clearinghouse

Generated by mp version 2.8.11 on Wed Feb 7 14:38:51 2007