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WMS
Tags
Farming, naip, Aerial Photography Field Office, FSA, USA, United State Department of Agriculture (USDA), Digital, United States Department of Agriculture (USDA), Androscoggin CO. Maine FSA, ortho imagery, imageryBaseMapsEarthCover, Maine, APFO, Field Service Center, USDA, Androscoggin, FIPS 23001, Mosaic
NAIP imagery may be distributed on an interim basis to meet USDA program requirements. The interim product is a compressed county mosaic. Users should be aware that the interim compressed county mosaic may contain defects and have horizontal accuracy less than the specified tolerances. Defective imagery may be replaced within one year of image acquisition date.
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 ortho imagery within one year of acquisition. NAIP provides two 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); and, 2 meter GSDortho imagery rectified to within +/- 10 meters of reference DOQQs. 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. This file was generated by compressing NAIP quarter quadrangle tiles that cover a county. MrSID compression, with mosaic option, was used. Target values for the compression ratio are (15:1) and compression levels(9) are used.
There are no credits for this item.
None, The Aerial Photography Field Office asks to be credited in derived products.
Extent
There is no extent for this item.
Maximum (zoomed in) | 1:5,000 |
Minimum (zoomed out) | 1:500,000 |
Monday through Friday
Majority years of Photography Dates
Users must assume responsibility to determine the usability of this data for their purposes.
None, The Aerial Photography Field Office asks to be credited in derived products.
None
Majority Aerial Photography Date
Monday through Friday
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 ortho imagery within one year of acquisition. NAIP provides two 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); and, 2 meter GSDortho imagery rectified to within +/- 10 meters of reference DOQQs. 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. This file was generated by compressing NAIP quarter quadrangle tiles that cover a county. MrSID compression, with mosaic option, was used. Target values for the compression ratio are (15:1) and compression levels(9) are used.
NAIP imagery may be distributed on an interim basis to meet USDA program requirements. The interim product is a compressed county mosaic. Users should be aware that the interim compressed county mosaic may contain defects and have horizontal accuracy less than the specified tolerances. Defective imagery may be replaced within one year of image acquisition date.
Majority years of Photography Dates
None
None, The Aerial Photography Field Office asks to be credited in derived products.
none
none
None
Color Digital imagery was collected with a Leica ADS40 Digital Sensor.
The ADS40 CCD array includes 12,000 pixels across track at 6.5 microns.
The digital imagery was acquired with a minimum of 20% sidelap, then
processed using Leica software to produce geo-referenced raster swaths.
The ADS imagery is subsequently used in the Aerial Triangulation (AT)
process in preparation for orthorectification. The horizontal accuracy
of the orthorectified imagery is primarily determined by the quality of
the airborne GPS, Inertial Measurement Unit (IMU) data and the surface
model (digital elevation model or DEM). The AT process is initiated with
the population of ADS project files with ABGPS/IMU data, horizontal
control from USDA furnished mosaicked DOQQs (mDOQQs) and vertical
control picked from the USGS DTED2 DEM data. IMU rotational data is
checked by reading common points on the mosaicked DOQQs and on the
new imagery. As a final check, stereo models are analyzed for parallax.
The absolute orientations for each swath containing exterior orientation
parameters for scan line is then output for use in orthorectification.
Each DOQQ is inspected for relative horizontal accuracy with adjacent DOQQ
tiles. Each DOQQ is inspected for image quality. DOQQs are color and
radiometrically balanced over a block consisting of a large number
of images. A sample of DOQQs is selected and inspected for relative
horizontal accuracy with the USDA furnished mDOQQs. Completed and
approved DOQQs are assembled into a countywide MrSID file, using a
compression factor of 1:50. The countywide MrSID file was then imported
into ArcSDE on a quad-by-quad basis.
24-bitpixels, 3 bandcolors (RGB) representing
brightness values 0 - 255.
USDA-FSA Aerial Photography Field Office Contract Specifications.
Users must assume responsibility to determine the usability of this data for their purposes.
The Maine Office of GIS and the GeoLibrary Board provide web mapping services to distribute aerial photos and other digital data. A WMS is not a web application which you can see in a web browser; rather, it requires you to add the service to a GIS software application.
http://www.maine.gov/geolib/wms.htm