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Lafayette_Co_2020.sid
2020-04-04T00:00:00
2020-07-27T00:00:00
Ayres Associates
5201 E. Terrace Dr., Suite 200
Madison
Wisconsin
53718
US
(608) 443-1200
(608) 299-2184
1
-90.328534
-90.307828
42.595751
42.579667
This project established digital, 4-band orthoimagery for Lafayette County, Wisconsin in 2020 as part of the Wisconsin Regional Orthoimagery Consortium (WROC).
Ayres Associates provided Lafayette County, Wisconsin with digital, 4-band orthoimagery services in 2020 as part of WROC. The aerial imagery was collected on April 4th and 5th using a Microsoft Vexcel UltraCam Eagle 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 oe exceeds 1.4 feet RMSEr according to the ASPRS Accuracy Standards for Digital Geospatial Data. Resultant orthoimagery was rectified to a DTM created from existing LiDAR. Orthoimagery was delivered in PLSS section GeoTiff and SID tiles and a project wide SID mosaic. The orthoimagery was delivered according to a PLSS section tile schematic. The project area covers approximately 634 square miles. Supplemental Information: The Wisconsin Regional Orthoimagery Consortium (WROC) is a multi-entity group led by regional planning commissions (RPCs) and WROC respresentatives from Ayres Associates. The goal of the consortium is to build and sustain a multi-participant program to acquire digital orthoimagery and elevation data throughout Wisconsin. Orthoimagery was collected for Lafayette County in 2020 to provide consistent deliverable products and accuracy standards for each of the participating entities.
digital
4-band
orthoimagery
6-inch
Not to be used for purposes other than those strictly outlined in the 2020 Lafayette County WROC program.
Wisconsin Regional Orthoimagery Consortium (WROC)
Lafayette County, Wisconsin
Lauree Aulik
Lafayette County
Land Information Officer
626 Main St.
Darlington
Wisconsin
53530
US
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20200806
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 2020 WROC Lafayette County program.
Ground control consisted of photo identifiable surveyed points. The imagery was collected using a Microsoft Vexcel UltraCam Eagle 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 DTM created from existing LiDAR. 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.
2020-05-05T00:00:00