Metadata for Digital Elevation Model Data, Yellowstone River Corridor, Stillwater, Yellowstone, and Dawson Counties, Montana, 2004

Identification Information
Data Quality Information
Spatial Data Organization Information
Spatial Reference Information
Distribution Information
Metadata Reference Information

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Identification Information:

Citation:

Originator: Merrick & Company

Publication date: 10/14/2005

Title:

Digital Elevation Model Data, Yellowstone River Corridor, Stillwater, Yellowstone, and Dawson Counties, Montana, 2004

Publication place: Helena, MT
Publisher: Montana State Library

Online linkage: ftp://ftp.geoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Collections/Yellowstone_River_Clearinghouse/Elevation/DEM

Larger Work Citation:

Originator: Merrick & Company
Originator: Woolpert, Inc.
Publication date: 2009
Title: Yellowstone River Floodplain Elevation Data, 2004-2007
Online linkage: http://apps.msl.mt.gov/Geographic_Information/Data/DataList/datalist_Details.aspx?did={197c8cad-2e4e-4965-8009-109451d68f84}

Abstract:

Elevation data for the Yellowstone River floodplain in Stillwater, Yellowstone, and Dawson counties, Montana. The data are in TIFF format with 2.5 meters between the data points, and are provided in 47 segments.

These data are derived from triangulated irregular network (TIN) datasets that were built from LIDAR data. The TIN data and similar TIN and DEM data collected in 2007 for the remainder of the lower Yellowstone River are available at http://geoinfo.montanastatelibrary.org/data/yellowstone_river_corridor_resource_clearinghouse/elevation_data.

Purpose:

These data were created as part of a joint Yellowstone River Conservation District Council and U.S. Army Corps of Engineers, Omaha District cumulative impacts study of the Yellowstone River channel and floodplain. The multi-agency interdisciplinary planning study extends 477 river miles from Sweetgrass County, Montana to the Missouri River confluence in McKenzie County, North Dakota. These data are specifically intended to provide an accurate digital surface model (topographic and bathymetric) with which to analyze the hydraulic conditions of the Yellowstone River channel and floodplain. In addition, they are intended to serve as a base for the project GIS and also to support a wide variety of analyses including planimetric data extraction (e.g., infrastructure, riverine geomorphology, land cover, habitat and vegetation), and to monitor long-term river channel changes. The first phase of the mapping focused on Stillwater, Yellowstone and Dawson Counties in Montana and included approximately 295 square miles of floodplain, together with 130 river miles of channel bathymetry.

Time period of content:

Beginning date: 05/01/2004
Ending date: 05/02/2004
Currentness reference: ground condition

Status:

Progress: Complete
Maintenance and update frequency: As needed

Access constraints: None

Use constraints:

Users are advised to use the TIN datasets if performing advanced analysis. Although the 2.5m DEM is very close to the accuracy of the TIN data, using the TIN data will ensure an accuracy of +- 0.5m from the ground surface. The TIN datasets from Merrick are also available.

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:

Nicole McClain
Project Coordinator
Yellowstone River Conservation District Council (YRCDC)
PO Box 148
Livingston, Montana 59047
Telephone: (406) 223-5702
Fax: (406) 222-9992
E-Mail: nmcclain@mt.gov

Data Quality Information:

Attribute accuracy report:

Verification of attribute accuracy of LIDAR points involves the use of filtering techniques. Auto-filtering uses algorithms to reclassify data in the point cloud. Hand-filtering involves the use of a technician working in a graphic environment to reclassify the erroneous points that may remain in the LIDAR point cloud after auto filter.

Completeness report:

The Arc/Info CREATETIN command was used with a proximal tolerance of 0.33m and a weed tolerance of 0.01m. CREATETIN produces a TIN from the DTM export files (model keypoints, bathymetric points, and breaklines).

Quantitative horizontal positional accuracy assessment:

Horizontal positional accuracy value: 0.5 meters
Horizontal positional accuracy explanation:: Horizontal accuracy was tested by comparing the raw contours from each flightline against adjoining flightlines at specific points.

Vertical positional accuracy report:

LIDAR points were tested for vertical accuracy by comparing their values to known control points. Ground GPS techniques were used to establish the control locations. Survey control points were used to validate the accuracy of the LIDAR surface model and effects of filtering algorithms for vegetation removal. This "ground truth survey" was conducted in unique land cover and land use areas. Contour lines were generated and were verified for accuracy against surveyed spot elevations. Supplemental breaklines were added to more accurately model certain features. This essential validation proves the accuracy of the contours relative to the adjustment of the LIDAR data.

The DEM was evaluated for accuracy by generating a coverage of thousands of points in ArcInfo then using tinspot and latticespot commands to add the elevations from the TIN data and from the DEM to each point. The absolute value of the difference between the two elevations for each point were calculated. The mean difference between the TIN data and DEM was found to be 0.036 meters.

Quantitative vertical positional accuracy assessment:

Vertical positional accuracy value: 0.2 meters
Vertical positional accuracy explanation:: The vertical positional accuracy of the data is verified by a control report that matches known ground control points against LIDAR acquired points. The conversion of the data from TIN format to DEM format introduces additional uncertainty. The average difference between elevations interpolated from TIN data and elevations interpolated from DEM data for 24,000 sample points was found to be 0.036 meters.

Lineage:

Source information:

Originator: Aerial Surveys International, LLC
Publication date: Unpublished material
Title: Color Photography
Source scale denominator: 15840
Type of source media: filmstrip
Source contribution: Film supplied for scanning.
Calendar date: 05/01/2004
Calendar date: 05/02/2004

Source information:

Originator: Merrick & Company
Publication date: 09/01/2004
Title: Fully Digital Analytical Aerotriangulation Report (FDAAT)
Source contribution:: Control network result with camera calibration information
Calendar date: 09/01/2004

Source information:

Originator: U.S. Geological Survey
Publication date: 02/11/2002
Title:: Report of Calibration of Aerial Mapping Camera; USGS Report No. OSL/2825
Source contribution: Camera calibration parameters
Calendar date: 01/17/2003

Source information:

Originator: Merrick & Company
Publication date: 08/05/2004
Title: Ground Control
Source contribution: Survey data for aerotriangulation and data quality control.
Calendar date: 08/05/2004

Source information:

Originator: Merrick & Company
Title: Digital Terrain Model (DTM)
Type of source media: online
Source contribution:: The digital terrain model (DTM) was created from LIDAR data and from supplemental data compiled from aerial photography. The DTM meets National Map Accuracy Standards for one meter contours.

Source information:

Originator: Merrick & Company
Title: LIDAR (Light Detection and Ranging)
Source contribution:: LIDAR points form the basis of the DTM surface.
Beginning date: 09/08/2004
Ending date: 09/11/2004

Process step:

LIDAR data was collected using Merrick's ALS40 sensor. The data was field-verified for complete coverage of the project area. Raw data files were parsed into manageable client-specific tiles. These tiles were then processed through automated filtering that separates the data into different classification groups: error points, ground points, and canopy-building points. The data was next taken into a graphic environment to reclassify the erroneous points that may remain in the LIDAR point cloud after auto filter. The surface was then normalized into a digital surface model (DSM). Final data extraction for the client's keypoint (statistically significant points) and canopy-building files were then generated.

Using orthophotography, planimetric features were compiled as breaklines to supplement the LIDAR data. The LIDAR digital surface model was then processed with the breaklines.

ASCII lines and points files were generated from the LIDAR data. A process is run in Arc/Info that removes points from the proximity of specified features, resulting in a cleaner data set. The Arc/Info CREATETIN command then outputs the TIN files from the lines and points files.

Process date: 02/17/2005

Process contact:

Doug Jacoby
Senior Project Manager

2450 South Peoria Street
Aurora, CO 80014
Telephone: 303-353-3903
Fax: 303-745-0964
E-Mail: doug.jacoby@merrick.com
Contact instructions: Call or email during business hours

Process step:

The 2.5 meter DEMs were produced from the ASCII TIN data using the TIN Tool (created by Merrick) and ArcGIS. Each ASCII file was processed and mosaiced using the TIN Tool in ESRI ArcInfo Workstation. The TIN Tool created a mosaiced TIN from the input ASCII files. The TIN was converted into a DEM in ArcGIS using ArcToolbox. The DEM tiles on the State Library web site were clipped from the DEM mosaics by the State Library.

Process date: 10/03/2005

Process contact:

Marcus Sadak
GIS Specialist
Montana Department of Natural Resources and Conservation
1424 9th Ave
Helena, MT 59620
Telephone: 406-444-0562
E-Mail: msadak@mt.gov
Contact instructions: Please use e-mail as primary contact

Spatial Data Organization Information:

Spatial Reference Information:

Horizontal coordinate system definition:

Grid coordinate system name: State Plane Coordinate System

SPCS zone identifier: 2500

Lambert conformal conic:

Standard parallel: 45
Standard parallel: 49
Longitude of central meridian: -109.5
Latitude of projection origin: 44.25
False easting: 600000
False northing: 0

Planar distance units: meters

Geodetic model:

Horizontal datum name: North American Datum of 1983
Ellipsoid name: Geodetic Reference System 80
Semi-major axis: 6378137.000000
Denominator of flattening ratio: 298.257222

Altitude system definition:

Altitude datum name: North American Vertical Datum of 1988
Altitude resolution: .001
Altitude distance units: meters
Altitude encoding method: implicit coordinate

Distribution Information:

Distributor:

Montana State Library
P.O. Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5354
E-Mail: geoinfo@mt.gov

Resource description: Downloadable data

Distribution liability:

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.

Standard order process:

Digital form:

Format name: TIFF images
Online option:

Metadata Reference Information:

Metadata date: 11/06/2013

Metadata review date: 05/13/2005

Metadata contact:

Andy Morris
ArcGIS Services Manager
Merrick & Company
2450 South Peoria Street
Aurora, CO 80014
Telephone: 303-353-3929
Telephone: 303-751-0741
Fax: 303-745-0964
E-Mail: andy.morris@merrick.com
Contact instructions: Call or email during business hours