This data set contains imagery from the National Agriculture Imagery Program (NAIP). The 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 ortho imagery within one year of acquisition. The NAIP provides two main products: 1 meter ground sample distance (GSD) ortho imagery rectified to a horizontal accuracy within +/- 5 meters of reference digital ortho quarter quads (DOQQ's) from the National Digital Ortho Program (NDOP) or from the National Agriculture Imagery Program (NAIP); 1 meter GSD ortho imagery rectified within +/- 6 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. The NAIP imagery is formatted to the UTM coordinate system using the North American Datum of 1983 (NAD83). The NAIP imagery may contain as much as 10% cloud cover per tile. This file was generated by compressing NAIP imagery that cover the county extent. Two types of compression may be used for NAIP imagery: MrSID and JPEG 2000. Target value for the compression ratio is (15:1).
The 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 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. The NAIP is also used for disaster response often providing the most current pre-event imagery.
Photography Source Image Dates.
None, The USDA-FSA Aerial Photography Field Office asks to be credited in derived products. If defects are found in the NAIP imagery during the warranty period such as horizontal offsets, replacement imagery may be provided. 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 Specifications.
N/A 2d only
Mosaicked County 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 Number 013 installed in a Rockwell 690B Turbo Commander N167R was used to fly this area. 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 28,900 feet. The state was flown in blocks for efficiency of capture and in order to accommodate the different elevations throughout the state. Flight planning software includes Delorme 4.5; Delorme Photo Flight 2.1.6; ZI Inflight 1.3; ZI Imageview 1.2; ArcView 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 for spectral compliance. Rectified frames are checked for spatial accuracy and also spectral compliance. DOQQs are thoroughly checked for spectral and spatial accuracy in Iras/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 a toplogy 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.
8-bit pixels, 3 band color (Red, Green, Blue) represent brightness values of 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).
Compressed Raster Data
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