Digital Orthoimagery, McLeod County, Minnesota, Spring 2022
Go to Section:- Overview
- Data Quality
- Data Organization
- Coordinate System
- Attributes
- Distribution - Get Data
- Metadata Reference
Section 1: Overview
Originator:McLeod County; 95West Aerial Mapping
Title:
Digital Orthoimagery, McLeod County, Minnesota, Spring 2022
Abstract:
Product: This orthoimagery data set includes 0.33-foot digital orthoimages in 8-bit 4-band GeoTIFF; MrSID county mosaic files (30:1 compression) and (15:1 compression) along with Jpeg2000 mosaic files. The geographic extent of McLeod County, Minnesota covers approximately 504 total square miles.Dataset Description: The McLeod County, MN 2022 Digital Orthoimagery project comprised of planning, acquisition, processing, and derived products of imagery data collected at a ground sample distance (GSD) of 0.33-foot. Project specifications are based on the American Society of Photogrammetry and Remote Sensing (ASPRS) standards. The data were developed based on a horizontal projection/datum of NAD83(86)HARN McLeod County, MN Coordinates, US Feet. Imagery data were delivered as 0.33-foot 8-bit 4-band GeoTIFF; MrSID county mosaic (MG3, 15:1 and 30:1 compression). Deliverables contained 605 individual irregular tiles. Ground Conditions: Imagery was collected in spring 2022, while no snow was on the ground and rivers were at or below normal levels. In order to post process the imagery data to meet task order specifications and meet ASPRS horizontal accuracy guidelines, 95West Aerial Mapping utilized a total of 7 control points to tie imagery to the ground and 5 check points to assess the horizontal accuracy of the Aerial Triangulation (AT).
Purpose:
These data depict geographic features on the surface of the earth. Digital Orthophotography for McLeod County, MN
Time Period of Content Date:
04/2022
Currentness Reference:
Ground condition. Imagery was flown April 8-9, 2022.
Progress:
Complete
Maintenance and Update Frequency:
None Planned
Spatial Extent of Data:
McLeod County, Minnesota
Bounding Coordinates:
-94.505050
-94.005780
44.981544
44.626789
Place Keywords:
McLeod County, Minnesota, MN
Theme Keywords:
imageryBaseMapsEarthCover, Orthophotography
Theme Keyword Thesaurus:
ISO 19115 Topic Categories
Access Constraints:
None
Use Constraints:
None
Contact Person Information:
Christy Christensen,
GIS Director
McLeod County
1400 Adams Street SE
Hutchinson,
MN
55350
Phone: 320-234-0230
Email: christy.christensen@co.mcleod.mn.us
Browse Graphic:
None available
Section 2: Data Quality
Attribute Accuracy:
Logical Consistency:
Radiometry is verified by visual inspection of the digital orthophotos. Slight systematic radiometric differences may exist between adjacent orthoimage files; these are due primarily to differences in source image capture dates and sun angles along flight lines. These differences can be observed in an image's general lightness or darkness when it is compared to adjacent orthoimage file coverages. Tonal balancing was performed over a group of images during the mosaicking process which may lightened or darkened adjacent images for better color tone matching.
Completeness:
Horizontal Positional Accuracy:
The project specifications require that only horizontal accuracy be computed for orthoimagery files. The required accuracy meets or exceeds ASPRS standards. The horizontal accuracy was tested with 5 checkpoints located throughout the project area. These checkpoints were not used in the calibration or post-processing of the imagery data. The checkpoints were distributed throughout the project area and were surveyed using GPS techniques. See survey report for additional survey methodologies. The x and y positions of where the checkpoints fell on the orthoimagery were collected. These values were then compared to the surveyed control point x and y values.
Vertical Positional Accuracy:
There is no vertical component for orthophotos.
Lineage:
Imagery Acquisition: Digital aerial imagery was obtained using a UltraCam Eagle camera equipped with Airborne GPS/IMU. A total of 30 flight lines were collected in the spring of 2022 in multi-spectral (RGB-IR) format. The 0.33-foot imagery was acquired at an altitude above mean terrain of 5900 feet to yield a pixel resolution suitable for photogrammetric mapping and orthophoto production. The imagery was collected under conditions free from clouds and cloud shadows, smoke, fog, haze, light streaks, snow, complete ice on water bodies, flooding, excessive soil moisture, and foliage. The imagery consisted of blue, green, red, and infrared bands. Imagery for the photogrammetric mapping and digital orthophotos was captured according to task order specifications regarding, snow, haze, and cloud cover.
Section 3: Spatial Data Organization (not used in this metadata)
Section 4: Coordinate System
Horizontal Coordinate Scheme:
Universal Transverse Mercator
UTM Zone Number:
15
Horizontal Datum:
NAD83
Horizontal Units:
meters
Vertical Datum:
Vertical Units:
Depth Datum:
Depth Units:
Cell Width:
0.1
Cell Height:
0.1
Section 5: Attributes
Overview:
Natural color imagery available
Detailed Citation:
Table Detail:
Section 6: Distribution
Publisher:
Minnesota Geospatial Information Office (MnGeo)
Publication Date:
11/19/2025
Contact Person Information:
MnGeo,
GIS Data Specialist
Minnesota Geospatial Information Office (MnGeo)
600 N Robert Street, Suite 2800
St. Paul,
MN
55146
Phone: 651-201-2499
Email: gisinfo.mngeo@state.mn.us
Distributor's Data Set Identifier:
McLeod County Imagery 2022 (base_mcleod_2022_airphotos)
Ordering Instructions:
The imagery is available to view as a WMS via MnGeo's Geospatial Image Service. The Geospatial Image Service web pages provide information for connecting to the server as well as information on how to use WMS Services. Due to file size there is currently no option to download the photos. Online Linkage: I AGREE
to the notice in "Distribution Liability" above. Clicking to agree will either begin the download process, link to a service, or provide more instructions. See "Ordering Instructions" above for details.
Section 7: Metadata Reference
Metadata Date:
11/19/2025
Contact Person Information:
MnGeo,
GIS Data Specialist
Minnesota Geospatial Information Office (MnGeo)
600 N Robert Street, Suite 2800
St. Paul,
MN
55146
Phone: 651-201-2499
Email: gisinfo.mngeo@state.mn.us
Metadata Standard Name:
Minnesota Geographic Metadata Guidelines
Metadata Standard Version:
1.2