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Aerial Imagery for Portage County, WI 2025

Identification Information

Citation
Title
Aerial Imagery for Portage County, WI 2025
Originator
Portage County
Creation Date
2025-04-16
Publication Date
2025-04-16
Geospatial Data Presentation Form
mapDigital
Collection Title
Aerial Imagery
Abstract
Ayres Associates provided Portage County, Wisconsin, with digital, 4-band orthoimagery services in 2025 as part of WROC. The aerial imagery was collected on April 16th, 26th, and May 4th using an UltraCam Eagle M3 sensor at 7.25 cm GSD mounted in a fixed-wing aircraft. Aerial imagery was collected to support 0.25 foot ground sample distance (GSD) orthoimagery at 1"=50' map scale. The 3-inch pixel orthoimagery was produced to meet or exceed 0.66 foot RMSEH according to ASPRS Positional Accuracy Standards for Digital Geospatial Data 2024. Resultant orthoimagery was rectified to a DEM created from existing lidar. Orthoimagery was delivered in GeoTiff and MrSID tiles and a project-wide MrSID mosaic. The orthoimagery was delivered according to a PLSS quarter section tile schematic. The project area covers approximately 823 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 Portage County in 2025 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 Portage County, Wisconsin as part of the Wisconsin Regional Orthoimagery Consortium (WROC).]
Supplemental Information
This is an archived dataset held at UW-Madison.
Temporal Extent
Time Instant
2025-04-16T00:00:00
Bounding Box
West
-89.84499573
East
-89.22383037
North
44.68583261
South
44.2433797
ISO Topic Category
imageryBaseMapsEarthCover
Place Keyword
Portage 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 2025 WROC program.]
Status
completed
Maintenance and Update Frequency
notPlanned
Language
eng
Credit
Portage County, Ayres Associates
Point of Contact
Contact
Jeff Hartman
Position Name
GIS/LIS Manager
Delivery Point
1462 Strongs Ave
City
Stevens Point
Administrative Area
Wisconsin
Postal Code
54481
Country
US
Email
hartmanj@co.portage.wi.us
Phone
(715) 346-1334

Spatial Reference Information

Reference System Identifier
Code
7626
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 an UltraCam Eagle M3 sensor at 7.25 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 to a DEM created from existing lidar. 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
2025-05-16T00:00:00
Process Step
Description
Added data to the WisconsinView Data Archive (WDA).
Process Date
2026-07-01T00:00:00

Distribution Information

Format Name
GeoTIFF
Format Version
1.0
Distributor
UW-Madison
Online Access
https://web.s3.wisc.edu/wsco-wisconsinview/imagery/counties/WI/Portage/2025
Protocol
Name
Access from GeoData@Wisconsin
Function
download

Content Information

Content Type
image

Spatial Representation Information

Raster
Number of Dimensions
2
Column Count
11164
Row Count
17931
Cell Geometry Type
area
Corner Points
Point
154241.544000 130733.570000
Point
154241.544000 135216.320000
Point
157032.544000 135216.320000
Point
157032.544000 130733.570000
Center Point
155637.044000 132974.945000

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
D8AA0D73-CAC1-4FEB-84AD-F7378B6648A2
Metadata Date Stamp
2026-07-01
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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