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Aerial Imagery for Clark County, WI 2023

Identification Information

Citation
Title
Aerial Imagery for Clark County, WI 2023
Originator
Clark County
Creation Date
2023-04-12
Publication Date
2023-04-12
Geospatial Data Presentation Form
mapDigital
Abstract
Ayres Associates provided Clark County, Wisconsin with digital, 4-band orthoimagery services in 2023 as part of WROC. The aerial imagery was collected on April 12th, 13th, 14th, 26th, and May 3rd using a Microsoft Vexcel UltraCam Eagle M3 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 specifactions at 1"=100' map scale. The 6-inch pixel orthoimagery was produced 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 countywide 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 and 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 Clark County in 2023 to provide consistent deliverable products and accuracy standards for each of the participating entities.
Purpose
This data is intended for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. [This project established digital, 4-band orthoimagery for Clark County, Wisconsin as part of the Wisconsin Regional Orthoimagery Consortium (WROC).]
Supplemental Information
This is an archived copy of the data held at UW-Madison.
Temporal Extent
Time Instant
2023-04-12T00:00:00
Bounding Box
West
-90.92311282
East
-90.31500215
North
45.03379621
South
44.42243672
ISO Topic Category
imageryBaseMapsEarthCover
Place Keyword
Clark County, Wisconsin
Place Keyword Thesaurus
Theme Keyword
Wisconsin Regional Orthoimagery Consortium (WROC)
Theme Keyword Thesaurus
Resource Constraints
Use Limitation
Although this data is being distributed by the University of Wisconsin-Madison, no warranty expressed or implied is made by the University as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the University in the use of this data, or related materials. [Not to be used for purposes other than those strictly outlined in the 2023-25 Clark County WROC program.]
Status
completed
Maintenance and Update Frequency
notPlanned
Language
eng
Credit
Clark County, Wisconsin
Point of Contact
Contact
Derek Weyer
Position Name
Planning, Zoning, and Land Information Administrator
Delivery Point
517 Court St. Room 204
City
Neillsville
Administrative Area
Wisconsin
Postal Code
54456
Country
US
Phone
(715) 743-5131

Spatial Reference Information

Reference System Identifier
Code
7596
Code Space
EPSG
Version
8.8(10.4.0)

Data Quality Information

Lineage
Process Step
Description
Ground control consisted of photo identifable surveyed points. The imagery was collected using a Microsoft Vexcel UltraCam Eagle M3 sensor at 14.5 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 countywide QL2 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 performed to minimize such effects.
Process Date
2023-05-12T00:00:00
Process Step
Description
Added data to the WisconsinView Data Archive (WDA).
Process Date
2026-06-12T00:00:00

Distribution Information

Format Name
GeoTIFF
Format Version
1.0
Distributor
UW-Madison
Online Access
https://web.s3.wisc.edu/wsco-wisconsinview/imagery/counties/WI/Clark/2023/
Protocol
Name
Access from GeoData@Wisconsin
Function
download

Content Information

Content Type
image

Spatial Representation Information

Raster
Number of Dimensions
2
Column Count
12071
Row Count
12600
Cell Geometry Type
area
Corner Points
Point
752975.690000 326837.790000
Point
752975.690000 333137.790000
Point
759011.190000 333137.790000
Point
759011.190000 326837.790000
Center Point
755993.440000 329987.790000

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
3484e11e-b6ed-45dc-87be-7dca6dfc474f
Metadata Date Stamp
2026-06-12
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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