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Aerial Imagery for Washington County, WI 2024

Identification Information

Citation
Title
Aerial Imagery for Washington County, WI 2024
Originator
Washington County
Creation Date
2024-03-11
Edition
2024
Geospatial Data Presentation Form
mapDigital
Other Citation Details
Flights dates: 03/06/2024 to 03/11/2024
Abstract
Ayres Associates provided the Southeastern Wisconsin Regional Planning Commission (SEWRPC) with digital, 4-band orthoimagery services in 2024 in conjunction with Wisconsin Regional Orthoimagery Consortium (WROC) in 2024. The aerial imagery was collected on: 3/6, 3/7, 3/9, 3/10, and 3/11 using an UltraCam Eagle M3 mounted in a fixed-wing aircraft. Aerial imagery was collected at 7cm ground sample distance (GSD). The resulting 3-inch pixel orthoimagery was produced to meet or exceed a horizontal accuracy of 0.70 feet RMSEr according to ASPRS Positional Accuracy Standards for Digital Geospatial Data. Resultant orthoimagery was rectified to a DEM created from LiDAR collected in 2015 and 2017. Orthoimagery was delivered in GeoTiff tiles according to SEWRPC tiling and naming scheme. The project area covers approximately 2,254 square miles and includes the counties of Ozaukee, Racine, Walworth, Washington and Waukesha. 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 SEWRPC 2024 to provide consistent deliverable products and accuracy standards for each of the participating entities. Raster File Type = TIFF Bit Depth/Pixel Type = 8-bit Raster Cell Size = .25 foot Interpolation or Resampling Technique = Cubic Convolution Required Vertical Accuracy = 1.2' at 95% confidence at well defined points
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 Southeastern Wisconsin Regional Planning Commission (SEWRPC) in conjunction with the Wisconsin Regional Orthoimagery Consortium (WROC) in 2024.]
Supplemental Information
This is an archived copy of the data held at UW-Madison.
Temporal Extent
Time Period
Begin
2024-03-06T00:00:00
End
2024-03-11T00:00:00
Bounding Box
West
-88.422998
East
-88.03435
North
43.548139
South
43.18818
ISO Topic Category
imageryBaseMapsEarthCover
Place Keyword
Washington County
Wisconsin
Place Keyword Thesaurus
Theme Keyword
Orthoimagery
Theme 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. [As directed by SEWRPC. Users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual ground conditions. Users should not use these data for critical applications without a full awareness of its limitations. Not to be used for purposes other than those strictly outlined in the 2024 WROC SEWRPC program.]
Maintenance and Update Frequency
irregular
Language
eng
Credit
Ayres Associates, Washington County
Point of Contact
Contact
Washington County
Point of Contact
Contact
Eric Damkot
Email
Eric.Damkot@washcowisco.gov
Point of Contact
Contact
Rob Merry
Email
rmerry@sewrpc.org

Spatial Reference Information

Reference System Identifier
Code
7641
Code Space
EPSG
Version
8.8(10.4.0)

Data Quality Information

Completeness Commission
Lineage
Process Step
Description
Ground control consisted of photo identifiable surveyed points. The imagery was collected using a Microsoft Vexcel UltraCam Eagle M3 at 7cm 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 2015 and 2017. The imagery was mosaicked using manual seamline generation and tone/color balanced to a project-wide consistency. Custom SEWRPC named RGBN GeoTIFF 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
2024-11-11T00:00:00
Process Step
Description
Added imagery to the WisconsinView Data Archive (WDA) in 2026.
Process Date
2026-03-10T00:00:00

Distribution Information

Format Name
Raster Dataset
Format Version
1.0
Distributor
UW-Madison
Online Access
https://geodata.wisc.edu/
Protocol
Name
GeoData@Wisconsin
Function
download

Content Information

Content Type
image

Spatial Representation Information

Raster
Number of Dimensions
2
Column Count
20000
Row Count
20000
Cell Geometry Type
area
Corner Points
Point
275000.000000 140000.000000
Point
275000.000000 145000.000000
Point
280000.000000 145000.000000
Point
280000.000000 140000.000000
Center Point
277500.000000 142500.000000

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
691736ef-5b50-4ea0-951c-4ffbcf9bd545
Metadata Point of Contact
Name
Arthur H. Robinson Map Library
Delivery Point
550 N. Park St.
City
Madison
Administrative Area
WI
Postal Code
53706
Country
US
Email
askmap@library.wisc.edu
Phone
608-262-1471
Metadata Date Stamp
2026-03-10
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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