GEOGRAPHIC INFORMATION

Elevation Data, ESRI Generate Files, Yellowstone River Corridor, Stillwater, Yellowstone, and Dawson Counties, Montana, 2004

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Data Provider Merrick and Company
Date 05/01/2004 - 05/02/2004
Content Type Downloadable data
Abstract The data consists of pairs of ESRI Generate files storing elevation data that may be converted to TIN (triangulated irregular network) data sets. Each pair of files covers a 1200mX1200m grid tile, and there are 813 tiles in the first phase of the mapping project.
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. The TINs were created to operate within the ArcGIS software environment. 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.
Supplemental Information These data are also available in DEM format and as ESRI TIN datasets at http://geoinfo.msl.mt.gov/Home/data/yellowstone_river_corridor_resource_clearinghouse/elevation_data, along with data (from 2007) for the remaining counties of the Yellowstone River corridor. There are two data files for each grid tile. One file has a .pnt extension. Each line in the .pnt file has four columns. The first column contains an ID number and is needed if the file is to be imported with the Arc/Info Generate tool. The second and third columns are the x and y coordinates of the point and the fourth column is the elevation of the point in meters. The other file has a .lin extension and contains the coordinates of hard breaklines used in developing the TIN. The information for each line segment in these files spans several records. The first record contains an ID number that is needed for the Arc/Info Generate tool. This is followed by at least two records of three columns each that contain the x, y, and elevation of a vertex along the line. Each line segment is terminated by a record that consists of the word END. This is the procedure to create a TIN from a pair of these files with ArcMap and ArcToolbox. The procedure requires that Arc/Info Workstation and 3D Analyst be installed. 1 - Use the Generate tool in the Coverage Tools-Conversion-To Coverage toolset to convert the .pnt file to a point coverage and the .lin file to a line coverage. 2 - Use the Create TIN tool in the 3D Analyst Tools-TIN Creation toolset to create a new empty TIN. 3 - Open the Edit TIN tool in the 3D Analyst Tools-TIN Creation toolset and add the two coverages you just made to the empty TIN. 4 - Set the height_field of the point coverage to $ANGLE and make sure its SF_type is masspoint. 5 - Make sure the SF_type of the line coverage is hardline. 6 - push the OK button.
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.
Data Access https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Collections/Yellowstone_River_Clearinghouse/Elevation/Generate
Distributor Montana State Library
P.O. Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5354
TDD/TTY: Montana Relay 711
Fax: 406-444-0266
Email: geoinfo@mt.gov
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.
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Metadata date 11/07/2013