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Goodhue_Co_2018.sid
2018-04-29T00:00:00
2018-08-09T00:00:00
Ayres Associates
5201 E. Terrace Dr., Suite 200
Madison
Wisconsin
53718
US
(608) 443-1200
(608) 299-2184
1
-93.097024
-92.220496
44.721542
44.165596
This project established digital, color orthoimagery for Goodhue County, Minnesota in 2018.
Ayres Associates provided Goodhue County, Minnesota with digital, color orthoimagery services in 2018. The aerial imagery was collected on April 29th using a DMC III sensor mounted in a fixed-wing aircraft. Aerial imagery was collected to support 0.5 foot ground sample distance (GSD) orthoimagery to meet ASPRS Class II horizontal accuracy specifications at 1"=100' map scale. The horizontal accuracy meets or exceeds 2.0 feet RMSE using the National Standard for Spatial Data Accuracy (NSSDA) standards. Resultant orthoimagery was rectified to a DEM surface created from existing state LiDAR data. Orthoimagery was delivered in custom-named PLSS section GeoTiff and MrSID tiles, township MrSID tiles, a MrSID mosaic for the City of Red Wing and a county-wide MrSID mosaic. The total project area is 935 square miles, which includes a buffer around the county boundary.
digital
color
orthoimagery
6-inch
Not to be used for purposes other than those strictly outlined in the 2018 Goodhue County Orthophotography Initiative.
Goodhue County, Minnesota
Lisa Hanni
Goodhue County Surveyor's Office
509 W. 5th St.
Red Wing
Minnesota
55066
lisa.hanni@co.goodhue.mn.us
US
(651) 385-3197
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20180809
Ayres Associates
5201 E. Terrace Dr., Suite 200
Madison
Wisconsin
53718
US
(608) 443-1200
(608) 299-2184
Ayres Associates
Images were color corrected to match adjacent flight lines. The resulting imagery was globally tilted in terms of contrast and color to form a radiometrically consistent orthophoto mosaic.
These data cover the entirety of the 2018 Goodhue County Orthophotography Initiative.
Ground control consisted of client paneled survey points. The imagery was collected using a DMC III sensor at 14.5 GSD. Image quality was verified during the post-flight review phase. Factors considered during this review included, but were not limited to, the presence of cloud cover, contrails, light conditions and sun flare. A rigorous Aerotriangulation process was performed and supplemented by the paneled survey points. The triangulated strips were rectified to a DEM surface created from existing state LiDAR data. The imagery was mosaicked using manual seamlines generation and tone/color balanced to a project-wide consistency. Custom-named PLSS section RGBN tiles were extracted from the mosaic and each individual tile was reviewed for artifacts and anomalies and adjusted as part of quality control procedures. The images were reviewed for rectification problems such as bridge displacements and seamline issues caused by the underlying digital elevation model. When necessary, local corrections to the imagery were performed to minimize such effects.
2018-05-30T00:00:00