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2021-04-04T00:00:00
2021-09-16T00:00:00
Ayres Associates
5201 E. Terrace Dr., Suite 200
Madison
Wisconsin
53718
US
(608) 443-1200
(608) 299-2184
1
-94.031891
-93.519834
44.546571
44.191858
This project established digital, 4-band orthoimagery for Le Sueur County, Minnesota in 2021.
digital
4-band
orthoimagery
3-inch
Not to be used for purposes other than those strictly outlined in the 2021 Le Sueur County, Minnesota program.
Le Sueur County, Minnesota
Justin Lutterman
Le Sueur County
GIS Manager/Address Coordinator
88 S. Park Ave.
Le Center
Minnesota
56057
US
jlutterman@co.le-sueur.mn.us
(507) 357-8577
Ayres Associates provided Le Sueur County, Minnesota with digital, 4-band orthoimagery services in 2021. The aerial imagery was collected on April 4th and 5th of 2021 using a Microsoft Vexcel UltraCam M3 sensor mounted in a fixed-wing aircraft equipped with Inertial Measurment Unit (IMU) and Airborne GPS. Aerial imagery was collected to support 0.25 foot ground sample distance (GSD) orthoimagery to meet ASPRS Level II horizontal accuracy specifications at 1"=50' map scale. The 3-inch pixel orthoimagery was produced to meet or exceed a horizontal accuracy of 0.7 feet root mean square error (RMSE), which equates to 1.2 feet at 95% confidence level. Resultant orthoimagery was rectified to a DEM created from the latest available LiDAR. Orthoimagery was delivered in PLSS quarter section GeoTiff and ECW tiles, and a project wide ECW mosaic. The total project area covers approximately 492 square miles.
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20210917
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 2021 Le Suere County, Minnesota program.
Ground control consisted of photo identifiable surveyed points. The imagery was collected using a Microsoft Vexcel UltraCam M3 sensor at 7.25cm 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 the latest available LiDAR. The imagery was mosaicked using manual seamlines generation and tone/color balanced to a project-wide consistency. PLSS quarter 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.
2021-05-09T00:00:00