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Aerial Imagery for Rock County, WI 2024

Identification Information

Citation
Title
Aerial Imagery for Rock County, WI 2024
Originator
Rock County
Creation Date
2024-03-11
Publication Date
2024-03-11
Geospatial Data Presentation Form
mapDigital
Collection Title
Aerial Imagery
Abstract
Ayres Associates provided Rock County, Wisconsin with digital, 4-band orthoimagery services in 2024 as part of WROC. The aerial imagery was collected on March 11th using a Leica Geosystems DMC III 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 specifications 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. Resultant orthoimagery was rectified to a DEM created from LiDAR collected in 2020. Orthoimagery was delivered in PLSS section GeoTiffs, MrSID tiles, and a project-wide MrSID mosaic. The orthoimagery was delivered according to a PLSS section tile schematic. The project area covers approximately 736 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 Rock Co 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 Rock Co, Wisconsin as a part of the Wisconsin Regional Orthoimagery Consortium (WROC).]
Supplemental Information
This is an archived dataset held at UW-Madison.
Temporal Extent
Time Instant
2024-03-11T00:00:00
Bounding Box
West
-89.36911524
East
-88.77650978
North
42.84746638
South
42.49197419
ISO Topic Category
imageryBaseMapsEarthCover
Place Keyword
Rock Co, 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 WROC Rock County program.]
Status
completed
Maintenance and Update Frequency
notPlanned
Language
eng
Credit
Rock County, Ayres Associates
Point of Contact
Contact
Michelle Schultz
Position Name
Real Property Lister/LIO
Delivery Point
51 S. Main St.
City
Janesville
Administrative Area
Wisconsin
Postal Code
53545
Country
US
Phone
608-757-5610

Spatial Reference Information

Reference System Identifier
Code
7629
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 Leica Geosystems DMC III sensor at 14.5 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 acquired in 2020. 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
2024-04-11T00:00:00
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/Rock/2024/
Protocol
Name
Access from GeoData@Wisconsin
Function
download

Content Information

Content Type
image

Spatial Representation Information

Raster
Number of Dimensions
2
Column Count
11248
Row Count
10772
Cell Geometry Type
area
Corner Points
Point
427183.209000 228443.364000
Point
427183.209000 233829.364000
Point
432807.209000 233829.364000
Point
432807.209000 228443.364000
Center Point
429995.209000 231136.364000

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
80ec51c8-d8cb-4912-a9f6-abd7dc364fd6
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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