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Jefferson_Co_2025.sid
2025-03-10T00:00:00
2025-06-13T00:00:00
Ayres Associates
5201 E. Terrace Dr., Suite 200
Madison
Wisconsin
53718
US
(608) 443-1200
(608) 299-2184
1
-89.018468
-88.531069
43.202907
42.838514
This project established digital, 4-band orthoimagery for Jefferson County, Wisconsin as part of the Wisconsin Regional Orthoimagery Consortium (WROC).
Ayres Associates provided Jefferson County, Wisconsin, with digital, 4-band orthoimagery services in 2025 as part of WROC. The aerial imagery was collected on March 10th, 31st, and April 6th using a Leica Geosystems DMC III sensor at 7.25 cm GSD mounted in a fixed-wing aircraft. Aerial imagery was collected to support 0.25 foot ground sample distance (GSD) orthoimagery at 1"=50' map scale. The 3-inch pixel orthoimagery was produced to meet or exceed 0.66 foot RMSEH according to ASPRS Positional Accuracy Standards for Digital Geospatial Data 2024. Resultant orthoimagery was rectified to a DEM created from lidar previously collected in 2019. Orthoimagery was delivered in GeoTiff and MrSID tiles and a project-wide MrSID mosaic. The orthoimagery was delivered according to a PLSS quarter section tile schematic. The project area covers approximately 582 square miles. Supplemental Information: The Wisconsin Regional Orthoimagery Consortium (WROC) is a multi-entity group of county members and partners led by regional planning commissions (RPCs) and WROC representatives 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 Jefferson County in 2025 to provide consistent deliverable products and accuracy standards for each of the participating entities.
digital
4-band
orthoimagery
3-inch
Not to be used for purposes other than those strictly outlined in the 2025 WROC program.
Wisconsin Regional Orthoimagery Consortium (WROC)
Jefferson County, Wisconsin
Matt Zangl
Jefferson County Planning and Zoning Department
Director of Planning and Zoning
Wisconsin
mattz@jeffersoncountywi.gov
US
(920) 674-8638
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20250625
Ayres Associates
5201 E. Terrace Dr., Suite 200
Madison
Wisconsin
53718
US
(608) 443-1200
Ayres Associates
Images were color corrected to match adjacent flight lines. The resulting imagery was tonally adjusted in terms of contrast and color to form a radiometrically consistent orthophoto mosaic.
These data cover the entirety of the 2025 WROC Jefferson County program.
Ground control consisted of photo identifiable surveyed points. The imagery was collected using a Leica Geosystems DMC III sensor at 7.25 cm 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 collected in 2019. 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.
2025-04-10T00:00:00