GEOGRAPHIC INFORMATION

USGS Topographic DRG Quadrangles of Montana, pre-1998

This data set may have multiple access options or be a data collection or member. Please see the Related Records tab for other data access options or collection members.

Data Provider U.S. Geological Survey
Date 1950 - 1996
Content Type Downloadable Data
Abstract These are images of U.S. Geological Survey topographic maps that we received in 1998. The files have not been updated since that time, and many of the maps are more than 50 years old.The quadrangles were scanned by the USGS Digital Raster Graphics (DRG) Program. A DRG is a scanned image of a U.S. Geological Survey (USGS) standard series topographic map, including all map collar information. The image inside the map neatline is georeferenced to the surface of the earth. The map is scanned at a minimum resolution of 250 dots per inch. The original images were TIFF images in UTM coordinates that used a 12-color pallette.There are three collections of maps and each collection is available in multiple formats. One collection consists of 1:24,000 scale maps of 3776 7.5-minute quadrangles. The second collection consists of 1:100,000 scale maps of 118 60x30-minute quadrangles, and the third collection consists of 1:250,000 scale maps of 31 2x1 degree quadrangles.The original DRG images of each quadrangle from USGS are available for each collection. These are images of the entire map sheet, including the map margins containing map titles, scalebars, and publication information. The images are registered to the UTM coordinate system, NAD 27.The State Library clipped the marginal information from each image and converted them to the Montana State Plane coordinate system, and this is the second format that each collection is available in. To facilitate easier distribution and use of the data, the library also compressed the images to MrSID format and mosaicked them so that each file covers a larger area. There are 111 1:24,000 scale images to cover the entire state and single mosaics covering the entire state for the 1:100,000 and 1:250,000 scale maps.
Purpose
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 http://geoinfo.msl.mt.gov/data/DRG
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.
View Metadata
View Metadata (XML)
Metadata date 08/23/2016