DNR Fall Color Infrared Imagery, Central Minnesota, 2012

This page last updated: 03/25/2013
Metadata created using Minnesota Geographic Metadata Guidelines

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

Section 1 Overview
Originator Resource Assessment Program, Division of Forestry, Minnesota Department of Natural Resources and Keystone Aerial Surveys Inc.
Title DNR Fall Color Infrared Imagery, Central Minnesota, 2012
Abstract This dataset contains 4 Band (RGBI) digital orthophoto imagery of Cass, Crow Wing, Hubbard, Mahnomen, Wadena, southern Clearwater and eastern Becker counties in north central Minnesota.

The orthophotos are 0.5-meter ground sample distance (GSD) and are in UTM Zone 15, NAD83 (meters). The tiling format of the imagery is based on a 3.75 x 3.75 quarter quadrangle with a 130-meter buffer on all four sides. The digital orthophoto quarter quadrangles (DOQQs) are in GeoTiff format with an associated world file. All imagery was collected by Keystone Aerial Surveys, Inc. with a Microsoft UltraCam Eagle camera from an altitude of approximately 25,000. All imagery was processed by Keystone using the camera manufacturer's software, Inpho's photogrammetry suite and Keystone created software.

This metadata record was created by MnGeo using information supplied by DNR and Keystone Aerial Surveys Inc.
Purpose The Minnesota DNR Division of Forestry will use this imagery to update regional forest cover maps and to evaluate forest condition and trends for timber production, wildlife habitat, forest health, water quality, etc. The aerial imagery is also used by non-DNR citizens, scientists, forest land owners, and land managers. Acquiring the imagery at peak fall color increases the ability to locate and identify tree species and forest type with greater accuracy.
Time Period of Content Date 09/2012
Currentness Reference Flown between September 23 and 24, 2012
Progress Complete
Maintenance and Update Frequency Irregular
Spatial Extent of Data Cass, Crow Wing, Hubbard, Mahnomen, Wadena, Southern Clearwater and Eastern Becker counties in north central Minnesota.
Bounding Coordinates -94.41
Place Keywords Cass, Crow Wing, Hubbard, Mahnomen, Wadena, Clearwater, Becker, Minnesota
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 access via the WMS service
Use Constraints Redistribution conditions: In obtaining this data from DNR and 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 Dennis Kepler, Remote Sensing & GIS Analyst
MN Department of Natural Resources
Resource Assessment
Grand Rapids, MN  55744
Phone: 218.322.2512
Fax: 218.327.4517
Email: dennis.kepler@state.mn.us
Browse Graphic Click to view a data sample
Associated Data Sets For more information on DNR's fall imagery program, including earlier imagery taken in other forested areas of Minnesota, see the Airphotos Online webpage: www.dnr.state.mn.us/airphotos/index.html

For information on other air photos available for Minnesota, see: www.mngeo.state.mn.us/chouse/airphoto/

Section 2 Data Quality
Attribute Accuracy N/A
Logical Consistency N/A
Completeness The dataset is complete to the specifications lain out by MNDNR such that there are no omissions or generalizations that affect the completeness of the dataset.
Horizontal Positional Accuracy ASPRS standard for 1:10,000-scale maps such that the circular root mean square error of 11.8 feet. Using NSSDA guidelines this is equivalent to having 95% of well-defined points fall within 20.5 feet.
Vertical Positional Accuracy N/A
Lineage Keystone Aerial Surveys Inc. acquired new vertical, digital black and white, color, and color infrared photography at an altitude of 25,000 feet, photo scale of 1''= 7532 (1:69,444) with a 0.5m GSD with their Microsoft UltraCam Eagle camera. Flight lines were N-S with a 76.5% forward overlap and a 23% side lap. The 25 flight lines and 2307 exposures were flown on September 23rd and 24th of 2012.

The UltraCam Eagle camera consists of 13 sensors: 9 panchromatic sensors and 4 color sensors. The color sensors are 4360 x 6670 pixels in size, with one sensor capturing red data, one capturing blue data, one capturing green data, and one capturing near-infrared data (band pass 680-940nm). The 9 pan sensors slightly overlap one to another and are used to produce one large image, 20010 x 13080 pixels in size. The vendor's processing software and current calibration are used to create the final image and pan sharpen the color bands to create the final RGBI image at the above dimensions and a pixel size of 5.2 microns.

The digital acquisition was accompanied by the collection of airborne Global Positioning System (GPS) data and inertial measurement unit (IMU) data, the post processing of which yields a strong exterior orientation (EO) for each photograph and a very accurate center position.

A fully analytical Aerotriangulation (AT) of the aerial images was conducted using ground control, GPS and the IMU data to further refine the EO for each image to be used in the orthorectification process. This was accomplished with Inpho Match-AT. The MNDNR provided the USGS 30-meter DEM to Keystone for use in the orthorectification process. These were loaded into visualization software to confirm their accuracy and, where needed, were corrected and/or enhanced using Inpho DTMaster.

Digital Orthophoto Quarter-Quads were developed following the USGS standards for digital orthophotos (DOQs) with the exception of pixel resolution 0.5 meters and file format (TIFF with world files). USGS header (.hdr) files were not included as a deliverable. Keystone used Inpho OrthoMaster to create orthophotos and Inpho OrthoVista to seam the DOQQs and the Inpho suite, and ESRI ArcGIS and Photoshop CS3 to radiometrically balance and seam the DOQQs.

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 0.500000
Cell Height 0.500000

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 Department of Natural Resources
Publication Date 02/27/2013
Contact Person Information Nancy Rader, GIS Data Coordinator
Minnesota Geospatial Information Office
658 Cedar Street, Room 300
St. Paul, MN  55155
Phone: 651-201-2489
Email: gisinfo.mngeo@state.mn.us
Distributor's Data Set Identifier DNR Fall Color and CIR DOQs 2012
Distribution Liability 1. Minnesota Department of Natural Resources General Geographic Data License Agreement

1) The Minnesota Department of Natural Resources (MNDNR) grants to you a non-exclusive, non-sublicensable, license to use these digital data. This License agreement applies to all digital data acquired from DNR staff, FTP sites, or other internet-based delivery systems. In the event that another license agreement issued by DNR staff is explicitly associated with a particular data set, the terms of the other license agreement prevail, and the terms expressed in this more general license agreement are nullified.

2) The MNDNR makes no representations about the suitability of these data for any purpose. The data are provided 'as is' without express or implied warranties, including warranties of merchantability and fitness for a particular purpose or non-infringement.

3) MNDNR is not obligated to provide updates to these data in the event that newer versions become available. MNDNR provides documentation when available through established distribution mechanisms.

4) The user relieves the MNDNR and its respective officers, agents, and employees of any liability for any and all damages resulting from use of mis-use of these data including, but not limited to:
a. Incidental, consequential, special or indirect damages of any sort, whether arising in tort, contract or otherwise, even if MNDNR has been informed of the possibility of such damages, or
b. For any claim by any other party. Furthermore, in States that do not allow the exclusion of limitation of incidental or consequential damages, you may not use these data.

5) When these data are used in the development of digital or analog (hardcopy) products, MNDNR must be acknowledged as having contributed data to the development of the product.

6) Although the use of these data are not restricted, they may not be sold commercially or privately without the written permission of MNDNR.

2. MnGeo's data disclaimer is online: www.mngeo.state.mn.us/chouse/disclaimer.html
Ordering Instructions These air photos are available via MnGeo's WMS service as two separate layers: a natural color version and a color infrared version. Click on the link below for more information about WMS services and how to use them.

To order prints or to see earlier years of imagery from DNR's fall flights, see the Airphotos Online webpage: www.dnr.state.mn.us/airphotos/index.html
Online Linkage I AGREE to the notice in "Distribution Liability" above. Clicking to agree will either begin the download process or link to download information. See "Ordering Instructions" above for details.

Section 7 Metadata Reference
Metadata Date 03/25/2013
Contact Person Information Nancy Rader, GIS Data Coordinator
Minnesota Geospatial Information Office
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: 03/25/2013
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