This data set contains imagery from the National Agriculture 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 availability of of ortho imagery within one year of acquisition. NAIP provides four main products: 1 meter ground sample distance (GSD) ortho imagery rectified to a horizontal accuracy of within +/- 5 meters of reference digital ortho quarter quads (DOQQ's) from the National Digital Ortho Program (NDOP); 2 meter GSD ortho imagery rectified to within +/- 10 meters of reference DOQQs; 1 meter GSD ortho imagery rectified to within +/- 6 meters to true ground; and, 2 meter GSD ortho imagery rectified to within +/- 10 meters to true ground. The tiling format of NAIP imagery is based on a 3.75' x 3.75' quarter quadrangle with a 300 meter buffer on all four sides. NAIP quarter quads are formatted to the UTM coordinate system using NAD83. NAIP imagery may contain as much as 10% cloud cover per tile.
NAIP imagery is available for distribution within 60 days of the end of a flying season and is intended to provide current information of agricultural conditions in support of USDA farm programs. For USDA Farm Service Agency, the 1 meter GSD product provides an ortho image base for Common Land Unit boundaries and other data sets. The 1 meter NAIP imagery is generally acquired in projects covering full states in cooperation with state government and other federal agencies who use the imagery for a variety of purposes including land use planning and natural resource assessment. With an annual cycle, NAIP is also used for disaster response often providing the most current pre-event imagery. While suitable for a variety of uses the 2 meter GSD NAIP imagery is primarily intended to assess crop condition and compliance to USDA farm program conditions. The 2 meter imagery is generally acquired only for agricultural areas within state projects.
ground condition
Users should be aware that this is an interim release. The interim compressed county mosaic may contain defects and have horizontal accuracy less than the specified tolerances. Imagery may be replaced to address defects found in a small number of products through quality assurance processes. Imagery containing defects that require the acquisition of new imagery, such as excessive cloud cover, specular reflectance, etc., will not be replaced within a NAIP project year.
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NAIP 3.75 minute tile file names are based on the USGS quadrangle naming convention.
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FSA Digital Orthophoto Specs.
Digital Georectifed Image.
Photo positions provided by the USDA were imported into various flight management systems and logged into a database noting the date flown and aircraft/camera used. This database was used for internal/external progress reporting and creation of these data files. Flight crews photographed the missions in NE, starting July 6 and ending August 15. All systems collected Airborne GPS data using dual frequency receivers and collecting data at a minimum of one second intervals. Post processing of all GPS data was preformed by Surdex with GraphNav software. All imagery was acquired using 4 Intergraph DMC (Digital Mapping Cameras) and post processed using Intergraph DMC software. All the imagery was inspected by Surdex and their team members. Dodging and building image pyramids were handled using Surdex developed software. For Aerial Triangulation (AT) purposes, Nebraska was subdivided into 25 blocks. AT on all frames flown was preformed in their respective UTM zone using Z/I Imaging?s ISAT and Surdex Snoop tools. All usable frames of photography were ortho-rectified at 2 meter resolution using the USGS National Elevation Dataset (NED) and Surdex developed orthorectification software. Using the common overlap between adjacent frames, all imagery was digitally mosaicked together and DOQQ were cut from a seamless virtual mosaic. A majority of each DOQQ will come from a single date of photography, which is identified in the date embedded in the DOQQ filename and CCM metadata, for inclusion in the County Compressed Mosaics (CCM) and uncompressed delivery on DLT tape. Radiometric balancing was performed using Inpho Orthovista software. Approximately 20 check points per county were collected over each reference imagery provided by the USDA and the new 2006 CCM to ensure the 10 meter accuracy was met.
Metadata imported.
24-bit pixels, 3 band color(RGB) values 0 - 255
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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).
Natural Color
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