USDA-FSA-APFO
20151106
USDA-FSA-APFO Digital Ortho Mosaic
Salt Lake City, Utah
USDA_FSA_APFO Aerial Photography Field Office
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
or 1/2 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
pixel 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 covers
the county extent. Two types of compression may be
used for NAIP imagery: MrSID and JPEG 2000. The target
value for the compression ratio is 15:1 for the 1 meter
imagery and 60:1 for the 1/2 meter imagery.
The NAIP imagery is typically 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 and 1/2 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.
20151106
Photography Source Image Dates.
Irregular
-92.317250
-91.494249
46.816054
46.121443
None
farming
Digital Ortho Rectified Image
Mosaic
Quarter Quadrangle
Ortho Rectification
Compression
MrSID
JPEG 2000
NAIP
Compliance
Aerial Compliance
Geographic Names Information System
Douglas CO., WI FSA
FIPS 55031
Douglas
Wisconsin
There are no limitations for access.
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 1 year
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.
USDA-FSA Aerial Photography Field Office
mailing and physical address
2222 West 2300 South
Salt Lake City
Utah
84119-2020
USA
801-844-2922
801-956-3653
apfo.sales@slc.usda.gov
None
None
None
NAIP 3.75 Quarter Quadrangles mosaicked into a County format
using data compression software. The target values for the
compression ratio are 15:1 for the 1 meter imagery and 60:1
for the 1/2 meter imagery.
NAIP 3.75 minute tile file names are based
on the USGS quadrangle naming convention.
None
NAIP Specifications
N/A 2d only
USDA-FSA Aerial Photography Field Office
20151106
Douglas CO., WI FSA
12000
External Media Types
20151106
Majority Aerial Photography Date
MrSID Compressed Image
Mosaicked County Image
Flight planning was performed in Leica MissionPro over a
buffered boundary covering DOQQ extents provided by the USDA. A
500m reduced resolution DEM file was used to determine
ground heights. A targeted flight altitude of approximately
18,000 feet above ground level with sidelap of 27% was used
for flight planning parameters. Five Cessna Conquests and
a Cessna 414 were utilized for acquisition, the seamline shapefile
clarifies which aircraft were used for a given area. All aircraft
were equipped with Leica ADS100 systems where utilized for data
capture. The Leica ADS100 pushbroom sensor
has been calibrated by the manufacturer as well as validated
against a local calibration range. The calibration includes
measuring the radiometric and geometric properties of the
camera. These data are used in the Post Processing Software
to eliminate the radiometric and geometric distortion.
All aerial imagery was collected with associated GPS/IMU
data. ADS collection requires high quality IMU data for
processing and was critical for early access hosting of digital
data to the web for USDA interim access and review.
After early access web delivery was complete, all
imagery was triangulated using Leica XPro in which
the airborne GPS data was constrained to expected limits.
The final adjustments assure a high quality relative adjustment
and a high quality absolute adjustment limited to the
airborne GPS data accuracy. This process assures the final
absolute accuracy of all geopositioned imagery. Both
signalized and photo identified
ground control were used to QC and control the IMU/GPS
based aerial triangulation bundle block solution. For each
project area the latest NED was downloaded from the USGS
National Map Seamless Server website in late Spring-Summer
2015. Thirty Meter NED was used in all cases, and preferred
over the available ten meter spacing to minimize image smearing
and distortions that are exacerbated by a finer, but not more
accurate DEM. A visual inspection of the NED using color cycled
classification by elevation and a shaded relief was performed
to check for gaps, corruption and gross errors. When available
the NED was compared to known higher quality elevation sources
to detect flaws. The predicted horizontal error for each
point was added as an attribute in the SURDEX enterprise
database. An operator reviews ortho seams
in areas these predicted errors indicate horizontal error in
excess of the contract specifications. Any imagery errors
introduced by source NED required patching from an alternate
perspective or strip of photography.
Processing hardware used included various brands of survey grade
GPS receivers, various brands and models of computers,
RAID6 storage, calibrated monitors, various brands of monitor
calibration colorimeters. Leica XPro was used for post
processing of ADS pushbroom data, triangulation and
orthorectification. SURDEX software was used to color correct
and remove bidirectional reflectance, vignetting and other
illumination trends. USDA APFO Image Metrics are measured and
images corrected to conform to the Image Metrics using
SURDEX software. GPS/IMU data was reduced to projected
coordinates in the appropriate UTM zone using Inertial Explorer
software from Novatel. Aerial Triangulation and orthorectification
was performed using Leica XPro. SURDEX software was
used to adjust for minor radiometric
variation between adjacent images. SURDEX software was used
to calculate the optimal seam path, check seam topology and
create master tiles. SURDEX ortho software generates
occlusion/smear polygons used during seam review
of steep terrain. SURDEX software was used to
visually inspect master tiles for seam and image defects.
SURDEX software was used to project and cut final DOQQ image
files from masters. SURDEX software was used to create CCM
metadata. Lizardtech GeoExpress version 8.0.0.3065 was used
to create the CCM image file. SURDEX software was
used to perform final formatting, QC and naming of the DOQQ.
USGS metadata parser software was used to validate the metadata.
Various versions of Microsoft Windows were used in all phases of
production. Surdex Grouping Tool provides real-time updates
of the USDA APFO Image Metrics. The image technician adjusts
image correction parameters to bring the radiometric
characteristics of large groups of images within the Image
Metrics ranges. Grouping Tool was used again after
DOQQ and CCM production to
provide a quality assurance check. Individual DOQQ and CCM may
not meet the USDA APFO Image Metrics ranges due to land cover.
The goal is to have the state as a whole meet the Image Metrics.
To validate the accuracy of the block adjustment derived from
GPS/IMU, sensor parameters and conjugate point measurements,
photo identifiable ground control points
were field surveyed within each State. These points were
surveyed using GPS techniques to produce coordinates that are
accurate to +/- 0.25 meters RMSE in XYZ. The GPS surveying
techniques utilized assured that the coordinates are derived
in the required project datum and relative to an approved
National Reference System. If the block does not fit the
control points within specifications the pass and tie
points were reviewed for blunders and weak areas. If,
after these corrections were made, the block still
does not fit the control well the GPS and IMU processing were
reviewed. Once the block has proper statistics and fits the
control to specifications, the final bundle adjustment was
made. As AT points are frequently on man-made and other
vertical features not included in the DEM, these ortho
points can only be used to indicate regions of error by the
clusters of points that predict excessive horizontal
displacement. All products are reviewed by independent
personnel prior to delivery. The delivery is checked for
omissions, commissions, naming, formatting, specification
compliance and data integrity.
20151106
Douglas CO, Wisconsin
Raster
Pixel
Universal Transverse Mercator
15
0.9996
-93.0
0.0
500000
0.0
row and column
1.0
1.0
meters
North American Datum of 1983
Geodetic Reference System 80
6378137
298.257
24-bit pixels, 3 band color(RGB) values 0 - 255
None
Supervisor Customer Services Section
USDA-FSA Aerial Photography Field Office
mailing and physical address
2222 West 2300 South
Salt Lake City
Utah
84119-2020
USA
801-844-2922
801-956-3653
apfo.sales@slc.usda.gov
None
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 County Mosaic
Natural Color
None
DVD-R
ISO 9660
USB Hard Disk
NTFS
FireWire Hard Disk
NTFS
Flash drive
Fat32 or NTFS
Contact the Aerial Photography Field Office
for more information
20151106
USDA-FSA Aerial Photography Field Office
mailing and physical address
2222 West 2300 South
Salt Lake City
Utah
84119-2020
USA
801-844-2900
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998