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2022-05-07
2022-10-03
Ayres Associates
5201 E. Terrace Dr., Suite 200
Madison
Wisconsin
53718
US
(608) 443-1200
(608) 299-2184
1
-92.673491
-92.550676
44.630301
44.542103
This project established digital, 4-band orthoimagery for Goodhue County, Minnesota in 2022.
Ayres Associates provided Goodhue County, Minnesota with digital, 4-band orthoimagery services in 2022. The aerial imagery was collected on May 7th st using a Leica Geosystems DMCIII 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 6-inch pixel orthoimagery was produced to meet or exceed a horizontal accuracy of 1.4 foot RMSE according to ASPRS Positional Accuracy Standards for Digital Geospatial Data. Resultant orthoimagery was rectified to a DEM created from LiDAR acquired in 2020. Orthoimagery was delivered in PLSS section GeoTiff and MrSID tiles, township MrSID tiles and a project wide MrSID mosaic. The project area covers approximately 935 square miles.
digital
4-band
orthoimagery
6-inch
Not to be used for purposes other than those strictly outlined in the 2022 Goodhue County program.
Goodhue County, Minnesota
Lisa M. Hanni, L.S.
Goodhue County, Minnesota
LUM Director/County Surveyor/County Recorder/Assistant Administrator/Dodge County Surveyor
lisa.hanni@co.goodhue.mn.us
509 West 5th Street
Red Wing
MN
55066
(651) 385-3197
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20221003
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 2022 Goodhue County program.
Ground control consisted of photo identifiable surveyed points. The imagery was collected using a Leica Geosystems DMCIII at 14.5cm 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 photo ID survey points. The triangulated strips were rectified to a DEM created from LiDAR acquired in 2020. The imagery was mosaicked using manual seamlines generation and tone/color balanced to a project-wide consistency. 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.
2022-10-03