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Wausau_Schfld_3in_2015_G3.sid
2015-10-22T00:00:00
2015-04-27T00:00:00
Ayres Associates
5201 E. Terrace Dr., Suite 200
Madison
Wisconsin
53718
US
(608) 433-1200
(608) 299-2184
1
-89.770264
-89.549948
45.019372
44.894148
This project established digital, color orthoimagery for the City of Wausau, Wisconsin as part of the Wisconsin Regional Orthophotography Consortium (WROC).
Ayres Associates provided the City of Wausau, Wisconsin with digital, color orthoimagery services in 2015 as part of WROC. Aerial imagery was collected on April 27th using a Microsoft Vexcel UltraCam Eagle sensor mounted in a fixed-wing aircraft. Aerial imagery was collected to support 0.25 ground sample distance (GSD) orthoimagery to meet ASPRS Class II horizontal accuracy specifications at 1" = 50' map scale. The horizontal accuracy meets or exceeds 1.0 foot RMSE using the National Standards for Spatial Data Accuracy (NSSDA) standards. Resultant orthoimagery was rectified to the new DEM from a LiDAR surface created in 2015 as part of the WROC program. Orthoimagery was delivered in PLSS section GeoTiff and MrSID tiles and a project-wide MrSID mosaic. The orthoimagery was delivered according to a four-section tiling schematic. The total project area is 50 sq. miles, plus a 500-ft buffer around the city boundary. Geographic Description: The City of Wausau is located in north-central Wisconsin, where it is the county seat of Marathon County. The Wausau area is at the center of cultivation for American ginseng, as 95% of commercial ginseng grown in the United States comes from Marathon County. Supplemental Information: The Wisconsin Regional Orthophotography Consortium (WROC) is a multi-entity group 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 the City of Wausau in 2015 to provide consistent deliverable products and accuracy standards for each of the participating entities.
digital
color
orthoimagery
3-inch
Not to be used for purposes other than those strictly outlined in the 2015 City of Wausau Orthophotography Initiative.
Wisconsin Regional Orthophotography Consortium (WROC)
City of Wausau, Marathon County, Wisconsin
Dan Kerntop
City of Wausau
GIS Analyst
407 Grant St.
Wausau
Wisconsin
54403
Dan.Kerntop@ci.wausau.wi.us
US
(715) 261-6757
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Ayres Associates
5201 E. Terrace Dr., Suite 200
Madison
Wisconsin
53718
US
(608) 433-1200
(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 2015 WROC City of Wausau Orthophotography Initiative.
Ground control consisted of photo identifiable surveyed points. The imagery was collected using a Microsoft Vexcel UltraCam Eagle at 7 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 with a new LiDAR surface created in 2015 as part of the WROC program. The imagery was mosaicked using manual seamlines generation and tone/color balanced to a project-wide consistency. PLSS section RGB and CIR 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.
2015-05-30T00:00:00