Title: USDA-FSA-APFO NAIP County Mosaic
Originator: USDA - Farm Service Agency - Aerial Photography Field Office
Abstract:
NAIP mosaics are county mosaics of aerial photos in quarter quads produced for the National Agricultural Imagery Program (NAIP) and are comprised of scanned photographs that were acquired with a precision aerial mapping camera at a nominal scale of 1:40,000 on color positive film. Acquisition was leaf on with mature crops prior to harvest.
The aerial film was scanned and digitally rectified at a resolution of approximately two meters GSD for use as a visual interpretation tool and to take area measurements of farm fields to within +/- 5% accuracy. Horizontal accuracy of the imagery can be very good. However, the imagery was not intended to meet National Map Accuracy Standards. Significant horizontal offset relative to data of higher order accuracy can occur.
This digital imagery serves as a base for Farm Service Center GIS applications and is used to administer USDA commodity support programs and conservation planning. NAIP imagery is quarter quadrangle centered to provide consistent and repeatable coverage. Imagery from NAIP can be ortho-rectified to meet or exceed national map accuracy standard, or reproduced as a photographic product in a variety of scales and sizes.
The quarter quads are edge matched or seamed across county boundaries. In counties that are split by UTM zones, quarter quads are reprojected into the predominate zone. quarter quads may be produced and distributed in an incomplete form when constituent quarter quads are not available at production date.
For a variety of status maps for 2002-2007 , please click here here
Specifically, for a variety of status maps for 2008, please click here here
For NAIP 2008 coverage, please click
here
For NAIP 2008 acquistion, please click
here
Specifically, for NAIP 2007 coverage, please click
here
Specifically, for NAIP 2006 coverage: 1 and 2 meter, please click
here
For NAIP 2006 natural color vs infrared, please click
here
For NAIP 2006 film vs digital capture, please click
here
Format: Raster
- MrSID compression, with mosaic option, was used on NAIP
quarter quadrangles. For 2003 and 2004, default
values for the compression ratio are (20:1) and compression levels (10) are
used. 8-bit pixels represent
brightness values 0 - 255
For 2005, the compression is (15:1) and MrSID Generation 3 raster files are used.
ArcGIS 9.0 and 9.1 have built in support for MrSID generation 3.
For ArcGIS 8.3, MrSID generation 3 requires ArcGIS Desktop 8.3 Raster Update download and install.
For 2008, the images are either MrSid(.sid) or JPEG2000(.jp2). JPEG2000 images are of type '_m' meaning multi-spectral.
Spatial Reference Information: Universal Transverse Mercator, North American Datum of 1983
