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Calumet County 2018 Orthophoto
2018-05-05T00:00:00
2018-12-05T00:00:00
Ayres Associates
5201 E. Terrace Dr., Suite 200
Madison
Wisconsin
53718
US
(608) 443-1200
(608) 299-2184
1
-88.414954
-88.028797
44.251407
43.883820
This project established digital, 4-band orthoimagery for Calumet County, Wisconsin as part of the Wisconsin Regional Orthoimagery Consortium (WROC).
Ayres Associates provided Calumet County with digital, 4-band orthoimagery services in 2018 as part of WROC. The aerial imagery was collected on May 5th, 13th, 15th and 16th using a Leica Geosystems ADS100 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 producced to meet or exceed a horizontal accuracy of 1.4 feet RMSE according to ASPRS Positional Accuracy Standards for Digital Geospatial Data, 2014. Resultant orthoimagery was rectified to a DEM surface created from existing QL2 LiDAR data acquired in 2018. Orthoimagery was delivered in PLSS section GeoTiff and MrSID tiles and a project-wide MrSID mosaic. The orthoimagery was delivered according to a section tile schematic. Supplemental Information: The Wisconsin Regional Orthoimagery Consortium (WROC) is a multi-entity group of county members and partners led by representatives from Ayres Associates the North Central Wisconsin Regional Planning Commission (NCWRPC). 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 Calumet County in 2018 to provide consistent deliverable products and accuracy standards for each of the participating entities.
digital
4-band
orthoimagery
6-inch
Orthophoto
Aerial Imagery
Not to be used for purposes other than those strictly outlined in the Calumet County WROC program.
Wisconsin Regional Orthoimagery Consortium (WROC)
Calumet County, Wisconsin
Andrew Hess
Calumet County
GIS Administrator
206 Court St.
Chilton
Wisconsin
53014
US
(920) 849-1493, ext. 2302
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20181206
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 Calumet County WROC program.
Ground control consisted of photo identifiable surveyed points. The imagery was collected using a Leica Geosystems ADS100 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 surface created from LiDAR data acquired in 2018. 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 perfomed to minimize such effects.
2018-06-22T00:00:00