High Resolution Orthoimagery, Itasca County, Minnesota, Spring 2018

This page last updated: 12/11/2018
Metadata created using Minnesota Geographic Metadata Guidelines

Go to Section:
1. Overview
2. Data Quality
3. Data Organization
4. Coordinate System
5. Attributes
6. Distribution - Get Data
7. Metadata Reference

Section 1 Overview
Originator Itasca County and Surdex Corporation
Title High Resolution Orthoimagery, Itasca County, Minnesota, Spring 2018
Abstract This dataset contains leaf-off 4-band red, green, blue, infrared (RGBI) digital orthophoto imagery produced at 12-inch resolution from new aerial photography captured in Spring 2018. The imagery covers Itasca County, in northern Minnesota.

The downloadable shapefile shows the project flight lines, including an attribute for the date that each image was flown. This metadata record was created using information supplied by Surdex Corporation.
Purpose The imagery will be used for various planning, design research and mapping purposes.
Time Period of Content Date 05/2018
Currentness Reference Ground condition. The imagery was flown May 10-14, 2018. See the "DayFlown" attribute in the flight lines shapefile for the exact dates.
Progress Complete
Maintenance and Update Frequency Unknown
Spatial Extent of Data Itasca County, Minnesota
Bounding Coordinates -94.440717
Place Keywords Minnesota, MN, Itasca County
Theme Keywords imageryBaseMapsEarthCover, Orthophotography, Digital Orthophotography, Ortho, Orthophotos, Digital Orthorectified Images, Digital Orthophotos, DOQ, DOQQ, Imagery, Images, Aerial Photography, Aerial Photos, Digital Aerial Photography, Air Photo, Color Infrared, Four Band Imagery
Theme Keyword Thesaurus ISO 19115 Topic Category
Access Constraints Unrestricted
Use Constraints MnGeo Redistribution conditions: In obtaining this data from the Minnesota Geospatial Information Office (MnGeo), it is understood that you and/or your organization have the right to use it for any purpose. If you modify it, you are encouraged to apply responsible best practices by documenting those changes in a metadata record. If you transmit or provide the data to another user, it is your responsibility to provide appropriate content, limitation, warranty and liability information as you see fit.
Contact Person Information Dave Bily, GIS Coordinator
Itasca County Surveyor Office
123 NE 4th Street
Grand Rapids, MN  55744
Phone: 218-327-7380
Email: dave.bily@co.itasca.mn.us
Browse Graphic Click to view a data sample.
Screenshot of countywide natural color imagery
Associated Data Sets For information on other air photos available for Minnesota, see: https://www.mngeo.state.mn.us/chouse/airphoto/

Section 2 Data Quality
Attribute Accuracy All files are inspected to ensure that they conform to the specified file naming conventions, all files load in their correct geographic position.
Logical Consistency All files are inspected to ensure that they conform to the specified file naming conventions, all files load in their correct geographic position.
Completeness All files are inspected to ensure that they conform to the project specifications for file standard and content.

White line issue: The data was provided to MnGeo in non-overlapping tiles in State Plane coordinates. When the tiles are converted to UTM Zone 15 coordinates, they do not overlap perfectly, due to rounding errors. This causes a white (offsite) dashed line, about 2/3 on and 1/3 off, to appear between the tiles in the finished product. The line is one pixel wide, and thus only visible at the highest resolutions, at scale factors of about 1:10,000 or closer. It is only faintly visible at a scale of 1:24,000.
Horizontal Positional Accuracy Imagery and data meet ASPRS and NSSDA accuracy standards for 12-inch GSD products.
Vertical Positional Accuracy Not applicable.
Lineage Processing Steps:

1. Surdex Corporation:

Color digital imagery was flown at 1 inch =200 foot scale over an Area of Interest of approximately 3067 square miles under Master Contract 16AAP.

The imagery was processed and triangulated, and then it was fully orthorectfied and mosaicked for 12-inch digital orthophotography delivered as 4-band tiles sized 5,000 feet square. All survey ground control was also acquired and processed by the County of Itasca while imagery was controlled using Airborne GPS/IMU technology on board the aircraft at the time of acquistion and processed against a stationary GPS base station.

One Mrsid-GEN4 mosaic was created at 15:1 compression ratio for the color imagery, using Lizard Tech V8.0 software.

The imagery was provided to Itasca County in the State Plane Coordinate System 1983 (NAD_1983_HARN_StatePlane_Minnesota_North_Feet), with units in feet, 12-inch resolution.

2. Minnesota Geospatial Information Office (MnGeo)

Itasca County provided the imagery tiles to MnGeo which then reprojected the imagery from State Plane Coordinates to UTM coordinates, Zone 15, NAD83 and added it as a layer to the Geospatial Image Service.

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
Cell Width .3
Cell Height .3

Section 5 Attributes
Overview Imagery has 4 Bands with the order of Red, Green, Blue and Near Infrared.
Detailed Citation
Table Detail:

Section 6 Distribution
Publisher Minnesota Geospatial Information Office (MnGeo)
Publication Date 11/06/2018
Contact Person Information Nancy Rader, GIS Data Specialist
Minnesota Geospatial Information Office (MnGeo)
658 Cedar Street, Room 300
St. Paul, MN  55155
Phone: 651-201-2489
Email: gisinfo.mngeo@state.mn.us
Distributor's Data Set Identifier Itasca 2018 Imagery
Distribution Liability 1. Itasca County: THE COUNTY FURNISHES THIS DATABASE "AS IS", WITHOUT ANY SUPPORT WHATSOEVER, AND WITHOUT REPRESENTATION OR WARRANTY, INCLUDING BUT NOT IN ANY MANNER LIMITED TO, FITNESS, MERCHANTABILITY OR THE ACCURACY AND COMPETENESS OF THE DATABASE. The database is neither a legally recorded map nor a survey and is not intended to be used as one. The database is a compilation of records, information and data from various sources with varying accuracies and should be used for reference only. Verification of the data by qualified field survey or any other process is the sole responsibility of the user. No representation is made that data and features presented, accurately reflect true location. Itasca County or any other entity from whom data was obtained assume no liability for any errors or omissions herein. If discrepancies are found, please contact the Itasca County Department of Surveying and Mapping. Because the database is inherently complex and may not be completely free of errors, user is hereby advised to verify its work. In no event will the County be liable for direct, indirect, special, incidental or consequential damages arising out of the use of or inability to use the Database even if advised of the possibility of such damages. Specifically, the county is not responsible for any costs including, but not limited to, those incurred as a result of lost profits or revenue, loss of use of data, the costs of recovering such programs or data, the cost of any substitute program, claims by third parties, or for other similar costs. User agrees to indemnify and hold harmless the County from any and all claims, actions, suits, or damages including but not limited to, the cost of attorney's fees in the defense of any claims, arising from users use or dissemination of the Database herein.

2. MnGeo's disclaimer is here: https://www.mngeo.state.mn.us/chouse/disclaimer.html
Ordering Instructions The imagery is available to view via WMS (Web Mapping Service) from MnGeo's Geospatial Image Service. The Minnesota Geospatial Image Service web pages provide the url to connect to the service as well as information about how to use a WMS. Due to file size there is currently no option to download the photos.

Access via the Minnesota Geospatial Commons by clicking on the 'Online Linkage" field below.
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 12/11/2018
Contact Person Information Nancy Rader, GIS Data Specialist
Minnesota Geospatial Information Office (MnGeo)
658 Cedar Street, Room 300
St. Paul, MN  55155
Phone: 651-201-2489
Email: gisinfo.mngeo@state.mn.us
Metadata Standard Name Minnesota Geographic Metadata Guidelines
Metadata Standard Version 1.2
Metadata Standard Online Linkage https://www.mngeo.state.mn.us/committee/standards/mgmg/metadata.htm

This page last updated: 12/11/2018
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