Spatial Digital Database of Selected Data from the Geologic Map of the Western Part of the Cut Bank 1° x 2° Quadrangle, Northwestern Montana

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Frequently anticipated questions:


What does this data set describe?

Title:
Spatial Digital Database of Selected Data from the Geologic Map of the Western Part of the Cut Bank 1° x 2° Quadrangle, Northwestern Montana
Abstract:
The paper geologic map of the western part of the Cut Bank 1° x 2° quadrangle, northwestern Montana (Harrison and others, 1998) was digitized and initially attributed by the Montana Bureau of Mines and Geology (MBMG) and remitted to the U.S. Geological Survey for further attribution and publication of the geospatial digital files. The resulting digital geologic map GIS can be queried in many ways to produce a variety of geological maps.
Supplemental_Information:
This GIS dataset consists of one major ArcInfo dataset: a line and polygon file (cb250k) that contains geologic contacts and structures (lines) and geologic map rock units (polygons).
  1. How might this data set be cited?
    Harrison, J.E., Whipple, J.W., Lidke, D.J., Kayser, H.Z., and Miller, R.J., 2002, Spatial Digital Database of Selected Data from the Geologic Map of the Western Part of the Cut Bank 1° x 2° Quadrangle, Northwestern Montana: U.S. Geological Survey Miscellaneous Investigations Map I-2593, U.S. Geological Survey, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -114.00
    East_Bounding_Coordinate: -112.50
    North_Bounding_Coordinate: 48.50
    South_Bounding_Coordinate: 48.00
  3. What does it look like?
    http://geo-nsdi.er.usgs.gov/metadata/map-i/2593/browse.png (PNG)
    Low-resolution screen capture of the map sheet. 845x829 pixels, 32-bit RGB true color. 59k bytes.
    http://pubs.usgs.gov/imap/i2593/i2593.pdf (PDF)
    Printable copy of the map sheet, 400k bytes
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2002
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: map
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
      The map projection used is Transverse Mercator.
      Projection parameters:
      Scale_Factor_at_Central_Meridian: 1.0
      Longitude_of_Central_Meridian: -113.0
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 0.0
      False_Northing: 0.0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000795
      Ordinates (y-coordinates) are specified to the nearest 0.000795
      Planar coordinates are specified in meters
      The horizontal datum used is D_Clarke_1866.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    The 'Spatial digital database of selected data from the geologic map of the western part of the Cut Bank 1 x 2 degree quadrangle, ...' contains a detailed description of each attribute code. The database includes a geologic linework arc attribute table, cb250k.aat, that relates to the cb250k.con (contact look-up table), cb250k.st2 (structure look-up table),and cb250k.ref (source reference look-up table) files; a rock unit polygon attribute table, cb250k.pat, that relates to the cb250k.ru (rock unit look-up table) and cb250k.ref (source reference look-up table) files.
    Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/imap/i2593/i2593.pdf

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Harrison, J.E.
    • Whipple, J.W.
    • Lidke, D.J.
    • Kayser, H.Z.
    • Miller, R.J.
  2. Who also contributed to the data set?
    The Harrison and others (1998) geological map was digitized and minimally attributed by Ken Sandau (Montana Bureau of Mines and Geology (MBMG)) who then provided four minimally attributed ArcInfo interchange-format files to the U.S.G.S.; Robert J. Miller (USGS) combined the faults coverage into the contact and rock unit coverage; and Helen Z. Kayser (contractor) attached and attributed an interim geologic map data model.
  3. To whom should users address questions about the data?
    Pamela D. Derkey
    U.S. Geological Survey
    geologist
    904 W. Riverside Ave., Rm. 202
    Spokane, Wa
    USA

    1-509-368-3114 (voice)
    1-509-368-3199 (FAX)
    pderkey@usgs.gov

Why was the data set created?

This digital geospatial database is one of many being created by the U.S. Geological Survey (USGS) as an ongoing effort to provide geologic information in a geographic information system (GIS) for use in spatial analysis.

How was the data set created?

  1. From what previous works were the data drawn?
    Harrison and others (1998) (source 1 of 1)
    Harrison, J.E., Whipple, J.W., and Lidke, D J., 1998, Geologic map of the western part of the Cut Bank 1° x 2° quadrangle, northwestern Montana: U.S. Geological Survey Geologic Investigations Series Map I-2593, U.S. Geological Survey, Menlo Park, CA.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution: all mapped features and attributes
  2. How were the data generated, processed, and modified?
    Date: 1999 (process 1 of 2)
    The Harrison and others (1998) map of the western part of the Cut Bank 1° x 2° quadrangle was digitized and minimally attributed by Ken Sandau (Montana Bureau of Mines and Geology) under contract with the U.S. Geological Survey. Robert J. Miller (U.S. Geological Survey, Menlo Park, CA) combined the faults file into the contact and rock unit file. Then Helen Kayser (Information Systems Support, Inc., Spokane, WA) augmented the file with an interim geologic map data model (data base), further attributed and edited, and then plotted and compared to the original stable-base geologic map to check for digitizing and attributing errors. All processing by the U.S. Geological Survey was done in ArcInfo version 8.1 (installed on a Sun Ultra workstation).
    Date: 19-May-2009 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    U.S. Geological Survey
    Attn: Pamela D. Derkey
    Geologist
    Spokane, Washington

    1-509-368-3114 (voice)
    1-509-368-3199 (FAX)
    pderkey@usgs.gov
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    Attribute accuracy was verified by manual comparison of the source with hard copy printouts and plots.
  2. How accurate are the geographic locations?
    +/- 127 meters
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    This digital geologic map is wholly derived from Harrison and others (1998).
  5. How consistent are the relationships among the observations, including topology?
    Polygon and chain-node topology present. Polygons intersecting the neatline area 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.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints:
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.
  1. Who distributes the data set? (Distributor 1 of 1)
    USGS Information Services
    Box 25286 Denver Federal Center
    Denver, CO
    USA

    1-888-ASK-USGS (voice)
    303-202-4693 (FAX)
    ask@usgs.gov
  2. What's the catalog number I need to order this data set? USGS Geologic Investigations Series Map I-2593
  3. What legal disclaimers am I supposed to read?
    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 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 constitute 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 western part of the Cut Bank 1° x 2° 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).
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 05-Feb-2016
Last Reviewed: 25-Feb-2002
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://geo-nsdi.er.usgs.gov/metadata/map-i/2593/metadata.faq.html>
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