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Digital Aerial Imagery: Ozaukee, Racine, Walworth, Washington, and Waukesha Counties, WI 2020

Identification Information

Citation
Title
Digital Aerial Imagery: Ozaukee, Racine, Walworth, Washington, and Waukesha Counties, WI 2020
Originator
Southeastern Wisconsin Regional Planning Commission
Publication Date
2021-01-20
Edition
2020
Geospatial Data Presentation Form
mapDigital
Abstract
The Southeastern Wisconsin Regional Planning Commission (SEWRPC) obtained digital, 4-band orthoimagery services in 2020 in conjunction with Wisconsin Regional Orthoimagery Consortium (WROC) in 2020 (by Ayres Associates) for Ozaukee, Racine, Walworth, Washington, and Waukesha counties. The aerial imagery was collected on: 4/5, 4/7, 4/11, 4/16, 4/18, 4/19, 4/20, and 4/21 using an UltraCam Eagle M2 and M3 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 horizontal accuracy of 0.7 feet RMSE 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 2,258 square miles. Kenosha and Milwaukee counties were flown in a separate project by EagleView (formerly Pictometry). 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 2020 to provide consistent deliverable products and accuracy standards for each of the participating entities.
Purpose
This project established digital, 4-band orthoimagery for Southeastern Wisconsin Regional Planning Commission (SEWRPC) in conjunction with the Wisconsin Regional Orthoimagery Consortium (WROC) in 2020. Milwaukee and Kenosha counties were flown in a separate project by EagleView (formerly Pictometry.)
Supplemental Information
Archived dataset at UW-Madison.
Temporal Extent
Currentness Reference
ground conditions
Time Period
Begin
2020-04-05T00:00:00
End
2020-04-21T00:00:00
Bounding Box
West
-88.8452
East
-87.7118
North
43.5716
South
42.4714
ISO Topic Category
imageryBaseMapsEarthCover
Place Keyword
Ozaukee County
Waukesha County
Washington County
Walworth County
Racine County
Place Keyword Thesaurus
Theme Keyword
digital
4-band
Wisconsin Regional Orthoimagery Consortium (WROC)
Southeastern Wisconsin Regional Planning Commission (SEWRPC)
3-inch
orthoimagery
Theme Keyword Thesaurus
Resource Constraints
Use Limitation
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 2020 WROC SEWRPC program.
Legal Constraints
Use Limitation
None
Other Restrictions
As directed by SEWRPC.
Status
completed
Maintenance and Update Frequency
notPlanned
Language
eng
Credit
Southeastern Wisconsin Regional Planning Commission (SEWRPC)
Point of Contact
Contact
Rob Merry
Position Name
Chief Surveyor
Delivery Point
PO Box 1607
City
Waukesha
Administrative Area
Wisconsin
Postal Code
53187
Country
US
Email
rmerry@sewrpc.org
Phone
(262) 953-4289
Point of Contact
Contact
Michael Gosetti
Position Name
GIS Manager
Delivery Point
W239 N1812 Rockwood Drive
City
Waukesha
Administrative Area
WI
Postal Code
53187
Country
US
Email
MGOSETTI@SEWRPC.org
Phone
262.953.4292

Spatial Reference Information

Reference System Identifier
Code
2289
Code Space
EPSG
Version
10.037

Data Quality Information

Quantitative Attribute Accuracy Report
Absolute External Positional Accuracy
Lineage
Statement
Archived dataset at UW-Madison
Process Step
Description
Ground control consisted of photo identifiable surveyed points. The imagery was collected using a Microsoft Vexcel UltraCam Eagle M2 and 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 seamlines generation and tone/color balanced to a project-wide consistency. Custom SEWRPC named 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
2020-12-08T00:00:00

Distribution Information

Distributor
WisconsinView.org
Distributor
Southeastern Wisconsin Regional Planning Commission
Online Access
https://bin.ssec.wisc.edu/pub/wisconsinview/imagery/counties/
Protocol
WWW:DOWNLOAD-1.0-http--download
Name
WisconsinView.org
Function
download

Spatial Representation Information

Raster
Number of Dimensions
2
Row Count
20000
Column Count
20000
Cell Geometry Type
area

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
3CA13B43-BB8D-446C-8ED7-9CEC5588ABA9
Metadata Date Stamp
2021-01-20
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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