Metadata for 1973 Aerial Photos, Yellowstone River in Park County, Montana Metadata for 1973 Aerial Photos, Yellowstone River in Park County, Montana

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Identification Information:

Citation:

Originator: U.S Geological Survey

Originator: Positive Systems

Originator: Montana Department of Natural Resources and Conservation

Publication date: 2010

Title:

1973 Aerial Photos, Yellowstone River in Park County, Montana

Publication place: Helena, Montana
Publisher: Montana State Library

Online linkage: https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Collections/Yellowstone_River_Clearinghouse/Imagery/1973_yr_Park.zip

Larger Work Citation:

Title: Yellowstone River Aerial Photos
Online linkage: http://mslapps.mt.gov/Geographic_Information/Data/DataList/datalist_Details.aspx?did={4691733a-ab8a-11e3-9be7-425861b86ab6}

Abstract:

Georeferenced aerial photographs of the Yellowstone River in Park County, Montana, October 4, 1973. The data set consists of partially rectified, black and white digital mosaics of historic aerial photos with a horizontal resolution of 1.75 feet,

These photos were scanned from paper copies of aerial photographs provided by the Montana Department of Transportation.

Purpose:

The images of the 1973 river corridor were prepared for use in mapping historic changes in planimetric channel features, riparian vegetation and land use of the Upper Yellowstone River corridor. This work was performed in support of the Upper Yellowstone River Cumulative Effects Investigation.

Time period of content:

Calendar date: 10/04/1973
Currentness reference: ground condition

Access constraints: None

Use constraints:

The Montana State Library provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time.

Point of contact:

Chuck Dalby
Montana Dept of Natural Resources and Conservation
PO Box 201601
Helena, Montana 59620-1601
Telephone: 406-444-6644
E-Mail: cdalby@mt.gov

Data Quality Information:

Horizontal Positional Accuracy Report:

These images were georeferenced, rectified, and mosaicked using DIME software from Positive Systems. This is a process that warps the images to attempt to match control points between their photo images and ground control, rather than the standard practice of orthorectification using a digital elevation model. The locations of any features identified on these photos should be verified and adjusted using other sources of known accuracy.

The ground control for the 12 raster digital tiles that comprise the 1973 channel mosaic were developed using U.S. Forest Service and Surdex digital orthophotos that were imaged in 1999 and have a base accuracy of 3.3 feet for 90 percent of well-defined features. The accuracy report from the contractor suggests that some areas may be based on control whose accuracy is only 30 feet.

The RMS error for each tile, compared to the 1999 orthophotos, is as follows:

1 - Gardiner to McConnell Landing: 14.5 feet
2 - McConnell Landing to Corwin Springs: 16.9 feet
3 - Corwin Springs to Joe Brown: 12.9 feet
4 - Joe Brown to Point of Rocks: 12.6 feet
5 - Point of Rocks to Meditation Point: 24.5 feet
6 - Meditation Point to Grey Owl: 28.2 feet
7 - Grey Owl to Loch Leven: 15.2 feet
8 - Loch Leven to Mallards Rest: 23.0 feet
9 - Mallards Rest to Dry Creek: 12.2 feet
10 - Dry Creek to Shields River: 14.4 feet
11 - Shields River to Greeley Creek: 29.1 feet
12 - Greeley Creek to Springdale: 21.4 feet

Lineage:

Source information:

Originator: Montana Department of Transportation
Publication date: Unpublished Material
Title: 1973 Aerial Photos
Other citation details:: Photogrammetry Section
Bryce Larsen
406-444-6321
Source scale denominator: 15840
Type of source media: paper
Source contribution:: The data set consists of scanned images of these paper aerial photos.
Calendar date: 1973104

Process step:

Black and white, 9x9in, paper copies of the aerial photos were scanned at 800 dpi (the maximum resolution supported by the imagery, due to surface texture). Scans were then loaded, along with base imagery (USFS 1:24,000 orthophotos and SURDEX 1:6000 and 1:8000 orthophotos) onto a Windows 2000 WorkStation; a DIME project file was created and a rough mosaic layout was generated.

The base imagery and subject imagery were inspected to identify any coverage problems, and to ensure proper relative positioning (x,y translation and rotation), and scaling. DIME software was then used to automatically select tie points, using proprietary feature matching algorithims, within all overlapping image areas. Tie point density was greatest in the immediate channel corridor.

An iterative process was then initiated that resulted in the best fit geometric transformation (or warp) necessary to match the subject image to the base. Several successive iterations of automated and manual tie point selection and adjustment were done to provide the final output mosaic. QA/QC checks were observed throughout the process and included: assessment of linear errors, identification of gaps and breaks, visual verification of subject image match to base. Radiometric color balancing was then applied to the final mosaic


Process date: 08/2002

Spatial Data Organization Information:

Raster object information: