GEOGRAPHIC INFORMATION

National Elevation Dataset for Montana, 2002

Data Provider U.S. Geological Survey
Date 12/10/1998 - 04/01/2002
Content Type Downloadable Data
Abstract These data were removed from the State Library web site because better data are easily obtainable from the U.S. Geological Survey. Please read about the current data at http://ned.usgs.gov/about.html and use the Data link to obtain the data.These data are a series of files derived from the National Elevation Dataset that each cover 16 USGS 7.5-minute quadrangles, (a 30x30-minute area), plus the area around those quadrangles required to fill in a rectangle in the coordinate system of the file.There are four versions of the data: The "data" folder contains data in USGS DEM format, in Montana State Plane coordinates, NAD83, units meters. The elevations in these files are rounded to the nearest meter. These files were made at a time when ESRI did not support this coordinate system for DEM format files, and modern software may be unable to read the spatial reference from these files.The "utmdata" folder contains data in USGS DEM format, in UTM zone 11, 12, and 13 coordinates, NAD83, units meters. The elevations in these files are rounded to the nearest meter.The "fdata" folder contains data in Esri GridAscii format, in Montana State Plane coordinates, NAD83, units meters. The elevations are rounded to the nearest 1/100 of a meter.The "utmfdata" folder contains data in Esri GridAscii format, in UTM zone 11, 12, and 13 coordinates, NAD83, units meters. The elevations are rounded to the nearest 1/100 of a meter.The National Elevation Dataset (NED) is a seamless mosaic of best-available elevation data. The 7.5-minute elevation data for the conterminous United States are the primary initial source data. In addition to the availability of complete 7.5-minute data, efficient processing methods were developed to filter production artifacts in the existing data, convert to the NAD83 datum, edge-match, and fill slivers of missing data at quadrangle seams. One of the effects of the NED processing steps is a much-improved base of elevation data for calculating slope and hydrologic derivatives.The NED for Montana as of 4/1/2002 was donated to the Montana State Library by the Bureau of Land Management Montana/Dakotas office in Billings. The State Library combined the 30- and 10-meter DEMs into a single statewide dataset at 30 meter resolution and extracted data from that dataset to create these data files.
Purpose Geospatial elevation data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping, and visualization applications. DEMs can be used for creation of slope maps, aspect maps, shaded relief maps, and contour maps; for analysis of hydrography and runoff; for analysis of solar radiation received on the land; for determination of what part of the landscape is visible from various locations; for estimation of volumes of proposed earthworks or reservoirs; and for analysis of difficulty of traversing the terrain.
Supplemental Information
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/Elevation/NationalElevationData2002.zip
Distributor Montana State Library
PO 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 11/20/2014