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Aerial Imagery for Dane County, WI 2024

Identification Information

Citation
Title
Aerial Imagery for Dane County, WI 2024
Originator
Dane County
Creation Date
2024-03-06
Publication Date
2024-03-06
Geospatial Data Presentation Form
mapDigital
Collection Title
Aerial Imagery
Abstract
Ayres Associates provided Dane County, Wisconsin, with digital, 4-band orthoimagery services in 2024 as part of FlyDane/WROC. The aerial imagery was collected on: March 6th, 7th, 9th, 13th, 15th, and 28th using a Vexcel UltraCam Eagle M3 sensor mounted in a fixed-wing aircraft. Aerial imagery was collected to support 0.25 foot ground sample distance (GSD) orthoimagery to meet ASPRS Class II horizontal accuracy specifications at 1"=50' map scale. The 3-inch pixel orthoimagery was produced to meet or exceed a 1.2 foot horizontal accuracy at 95% confidence level, according to ASPRS Positional Accuracy Standards for Digital Geospatial Data. Resultant orthoimagery was rectified to a DEM created from newly acquired LiDAR collected in 2024. Orthoimagery was delivered in PLSS quarter-section GeoTiff and MrSID tiles and a project wide MrSID mosaic. The project area covers approximately 1250 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 Dane County in 2024 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 services for Dane County, Wisconsin as part of FlyDane and the Wisconsin Regional Orthoimagery Consortium (WROC).]
Supplemental Information
This is an archived dataset held at UW-Madison.
Temporal Extent
Time Instant
2024-03-06T00:00:00
Bounding Box
West
-89.83818442
East
-89.00893686
North
43.29413283
South
42.84514307
ISO Topic Category
imageryBaseMapsEarthCover
Place Keyword
Dane County, Wisconsin
Place Keyword Thesaurus
Theme Keyword
Wisconsin Regional Orthoimagery Consortium (WROC)
Theme Keyword Thesaurus
Theme Keyword
FlyDane
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 2024 WROC Dane County program.]
Status
completed
Maintenance and Update Frequency
notPlanned
Language
eng
Credit
Dane County, Ayres Associates
Point of Contact
Contact
Frederic Iausly
Position Name
Senior GIS Analyst
Delivery Point
210 Martin Luther King Jr. Blvd., Rm 339
City
Madison
Administrative Area
Wisconsin
Postal Code
53703
Country
US
Email
iausly@countyofdane.com
Phone
(608) 266-4398

Spatial Reference Information

Reference System Identifier
Code
7599
Code Space
EPSG
Version
8.8(10.4.0)

Data Quality Information

Lineage
Process Step
Description
Ground control consisted of photo identifiable surveyed points. The imagery was collected using a Vexcel UltraCam Eagle M3 sensor at 7.25cm 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 newly acquired LiDAR collected in 2024. The imagery was mosaicked using manual seamlines generation and tone/color balanced to a project-wide consistency. PLSS quarter-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
2024-04-06T00:00:00
Process Step
Description
Added data to the WisconsinView Data Archive (WDA).
Process Date
2026-06-18T00:00:00

Distribution Information

Format Name
GeoTIFF
Format Version
1.0
Distributor
UW-Madison
Online Access
https://web.s3.wisc.edu/wsco-wisconsinview/imagery/counties/WI/Dane/2024/
Protocol
Name
Access from GeoData@Wisconsin
Function
download

Content Information

Content Type
image

Spatial Representation Information

Raster
Number of Dimensions
2
Column Count
11506
Row Count
9821
Cell Geometry Type
area
Corner Points
Point
780598.941000 401006.170000
Point
780598.941000 403461.420000
Point
783475.441000 403461.420000
Point
783475.441000 401006.170000
Center Point
782037.191000 402233.795000

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
0e01c30a-3ec8-4655-bf8c-f4483e2bd260
Metadata Date Stamp
2026-06-18
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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