GEOGRAPHIC INFORMATION

Montana Tagged Vector Contour data

Data Provider Montana State Library
Date 2008
Content Type Downloadable Data
Abstract Tagged Vector Contours (TVC) are a by-product of the USGS development process for Digital Elevation Models and Digital Orthophoto Quadrangles. They consist of contour lines tagged with the elevations they represent, and additional lines representing streams and quadrangle boundaries. The lines were scanned from USGS 7.5-minute quadrangles, then converted to vector format and tagged with their elevations by the USGS in a semi-automated process.These data are a very rough product, and they may be inadequate for many cartographic purposes. There is no edgematching between the quadrangles, lines from adjacent quadrangles sometimes overlap each other by a significant amount, and there are many small spurious lines in the data.The TVC files for about 1000 quadrangles in Montana (about 1/3 of the state) were provided in DLG-Optional format by the USGS. The State Library converted the data to shapefile format and combined the data into 8 files. A map showing the area covered by each file is available at https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Elevation/Tagged_Vector_Contours/Data_Index.jpg.Contour lines have a value in their MINOR1 field equal to their elevation in feet or in meters. Lines which are not contours have a MINOR1 value of less than 0. The contour intervals are the same as the 7.5-minute quadrangles they were derived from. Those are usually in feet and the contour interval varies from 20 feet to 80 feet.
Purpose The files were created by USGS for the purpose of improving the quality of their Digital Elevation Model and Digital Orthophoto Quadrangle data.
Supplemental Information
TVC's are an interim product of the USGS DEM production system. In providing these TVCs, the USGS expresses no warranty or guarantee that they meet any standard for accuracy or completeness. 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/Tagged_Vector_Contours/
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 01/17/2014