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. 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 agencieswho 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.
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.
FSA Digital Orthophoto Specs.
Digital Georectifed Image.
Digital frames captured with a ZI Intergraph DMC with a footprint of 7680 x 13824 pixels were used to create Digital Orthophoto Quarter Quadrangles. DMC Serial Numbers 114, 137, and 142 installed in a Piper Cheyenne 1, Twin Cessna Turbo Charged 401, and Rockwell 695 Turbo Commander; N400CM, N34MM, and N9812S were used to fly. Calibration reports are on file with the USDA. 12 micron frames were captured at eight bits with 2.5 - 2.7 foot pixel using Windows Server 2003; ZI Mission Planning 1.3; Intergraph GeoMedia 6.0; DMC Image Analyst 5.2; DMC Post Processing 5.4; ZI Image Viewer 1.0; Microsoft Access; Microsoft Excel; Delorme XMap 4.5 and Adobe PhotoShop. Flights ASL was 18,000-20,000 or 28,900 feet. The state was flown in blocks for efficiency of capture and in order to accommodate the different evations throughout the state. Flight planning software includes Delorme 4.5; Delorme Photo Flight 2.1.6; ZI Inflight 1.3; ZI Imageview 1.2; ArcVew 3.2; Microsoft Access; and POSAV 2.1. Ground control points were collected by Photo Science crews. External Orientation files created from ABGPS data in Applanix POSPac MMS Version 5.2 and are rectified using ImageStation Project Manager 5.2; Intergraph GeoMedia 6.0; and Intergraph OrthoPro 5.2. Extensive Quality Control checks are performed on the data throughout the production process. Processed RAW Frames are checked forspectral compliance. Rectified frames are checked for spatial accuracy and also spectral compliance. DOQQs are thoroughly checked for spectral and spatial accuracy in Irs/C and Adobe PhotoShop. CCMs are checked for overall spectral compliance and spatial accuracy in ArcGIS. Seamline shapefiles are checked for gaps, slivers, overlaps and multipart features by building topology in ArcGIS. Ground control points are read off of rectified frames as a double-check and final DOQQs are used to calculate RMSE values in MicroStation and Excel. Frames are rectified with 10 meter NEDs in Intergraph OrthoPro. This surface is checked for errors at the mosaicked DOQQ level. If any areas presented problems, they are noted in a Digital Elevation Model Errors ASCII text file.
A compressed version of the NAIP TIFF imagery was created on behalf of the Arizona State Land Department by the US Forest Service (Albuquerque) using Lizard Tech GeoExpress software. The output resulted in 3-band MrSID (Gen III) files with a compression ratio of 1:15.
Internal feature number.
32-bit pixels, 4 band color(RGBIR) 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).
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