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Harrison, J.E., Cressman, E.R., Whipple, J.W., Kayser, H.K., and Derkey, P.D., 2000, Geologic and structure maps of the Kalispell 1:250,000 quadrangle, Montana, and Alberta and British Columbia: a digital database.: U.S. Geological Survey Miscellaneous Investigations Series Map I-2267, U.S. Geological Survey, Denver, CO.
This is a Vector data set. It contains the following vector data types (SDTS terminology):
The map projection used is Transverse Mercator.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest not determined
Ordinates (y-coordinates) are specified to the nearest not determined
Planar coordinates are specified in Meters
The horizontal datum used is North American Datum of 1927.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.98.
Jack E. Harrison, Earle R. Cressman, James W. Whipple compiled the geology and published the original geologic paper map.
EROS Data Center staff scanned/digitized geologic map and prepared the original ArcInfo data prior to 1994.
Montana Bureau Mines and Geology acquired the original data and, in 1999, provided it to the USGS in Spokane, WA.
R.J. Miller (USGS) converted the original data to a single topologically correct ArcInfo coverage.
Helen Z. Kayser (contractor) attached and attributed an interim geologic map data model.
Thomas P. Frost (USGS), Pamela D. Derkey (USGS), and William N. Kelley (contractor) visually compared the hard copy plots with the source documents;
This dataset was developed to provide geologic map GIS of the Kalispell 1:250,000 quadrangle for use in the future spatial analysis by a variety of users.
This database is not meant to be used or displayed at any scale larger than 1:250,000 (e.g., 1:100,000 or 1:24,000).
Harrison, Jack E., Cressman, Earle R., and Whipple, James W., 1992, Geologic and Structure Maps of the Kalispell 1°x2° Quadrangle, Montana, and Alberta and British Columbia.: U.S. Geological Survey Miscellaneous Investigations Series Map Map I-2267, U.S. Geological Survey, Denver, CO.
Person who carried out this activity:
Attribute accuracy was verified by manual comparison of the source with hard copy printouts and plots.
This digital geologic map is wholly derived from Harrison, and others (1992).
Polygon and chain-node topology present. Polygons intersecting the neatline are closed along the border. Segments making up the outer and inner boundaries of a polygon tie end to end to completely enclose the area. Line segments are a set of sequentially numbered coordinate pairs. No duplicate features exist nor do duplicate points in a data string. Intersecting lines are separated into individual line segments at the point of intersection. All nodes are represented by a single coordinate pair which indicates the beginning or end of a line segment.
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- This digital database is not meant to be used or displayed at any scale larger than 1:250,000 (e.g., 1:100,000 1:24,000).
Any hardcopies utilizing these data sets shall clearly indicate their source. If the user has modified the data in any way, they are obligated to describe the types of modifications they have performed on the hardcopy map. User specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the U.S. Geological Survey.
The U.S. Geological Survey (USGS) provides these geographic data "as is". The USGS makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. The USGS further make no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determined fitness for use lies lies entirely with the user. Although these data have been processed successfully on computers at the USGS, no warranty, expressed or implied, is made by the USGS regarding the use of these data on any other system, nor does the fact of distribution constite or imply any such warranty.
In no event shall the USGS have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of the delivery, installation, operation, or support by the USGS.
This digital geologic map database of the Kalispell 1:250,000 quadrangle is not meant to be used or displayed at any scale larger than 1:250,000 (e.g., 1:100,000 or 1:24,000)