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Aerial Imagery for Trempealeau County, WI 2023

Identification Information

Citation
Title
Aerial Imagery for Trempealeau County, WI 2023
Originator
Trempealeau County
Creation Date
2023-04-12
Publication Date
2023-04-12
Geospatial Data Presentation Form
mapDigital
Collection Title
Aerial Imagery
Abstract
Ayres Associates provided Trempealeau County, Wisconsin, with digital, 4-band orthoimagery services in 2023 as part of WROC. The aerial imagery was collected on April 12th and 13th using a Leica Geosystems DMCIII 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 horizontal accuracy of 0.7 foot RMSE according to ASPRS Positional Accuracy Standards for Digital Geospatial Data. Resultant orthoimagery was rectified to a DEM created from existing LiDAR collected in 2022. Orthoimagery was delivered in PLSS section GeoTiff and MrSID tiles and a project wide MrSID mosaic. The orthoimagery was delivered according to a quarter-section tile schematic. The project area covers approximately 742 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 Trempealeau County in 2023 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 Trempealeau 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
2023-04-12T00:00:00
Bounding Box
West
-91.6121372
East
-91.15199494
North
44.59692293
South
43.98430738
ISO Topic Category
imageryBaseMapsEarthCover
Place Keyword
Trempealeau 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 2023-25 WROC Trempealeau County program.]
Status
completed
Maintenance and Update Frequency
notPlanned
Language
eng
Credit
Trempealeau County, Ayres Associates
Point of Contact
Contact
Ann Hempel
Position Name
Land Records Modernization Coordinator
Delivery Point
36245 Main St.
City
Whitehall
Administrative Area
Wisconsin
Postal Code
54773
Country
US

Spatial Reference Information

Reference System Identifier
Code
7636
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 DMCIII at 7 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 surface created from LiDAR collected in 2022. 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
2023-05-16T00:00:00
Process Step
Description
Added data to the WisconsinView Data Archive (WDA).
Process Date
2026-06-15T00:00:00

Distribution Information

Format Name
GeoTIFF
Format Version
1.0
Distributor
UW-Madison
Online Access
https://web.s3.wisc.edu/wsco-wisconsinview/imagery/counties/WI/Trempealeau/2023/
Protocol
Name
Access from GeoData@Wisconsin

Content Information

Content Type
image

Spatial Representation Information

Raster
Number of Dimensions
2
Column Count
6641
Row Count
8356
Cell Geometry Type
area
Corner Points
Point
883582.400000 329684.572000
Point
883582.400000 331773.572000
Point
885242.650000 331773.572000
Point
885242.650000 329684.572000
Center Point
884412.525000 330729.072000

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
8b9cd16e-2f95-4bc1-9b1b-5ca3dd81a221
Metadata Date Stamp
2026-06-15
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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