Chromite deposits in central part Stillwater Complex, Sweet Grass County, Montana: A digital database for the geologic map of the east slope of Iron Mountain

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Frequently anticipated questions:


What does this data set describe?

Title:
Chromite deposits in central part Stillwater Complex, Sweet Grass County, Montana: A digital database for the geologic map of the east slope of Iron Mountain
Abstract:
The digital geologic map of the east slope of Iron Mountain, Sweet Grass County, Montana was prepared from preliminary digital datasets digitized by Optronics Specialty Co., Inc. from a paper copy of plate 10 from UGSG Bulletin 1015-D (Howland, 1955).The files were prepared and transformed to the Montana State Plane South projection by Helen Z. Kayser (Information Systems Support, Inc.). Further editing and attributing was performed by Lorre A. Moyer in 2001. The resulting spatial digital database can be queried in many ways to produce a variety of derivative geologic maps.
Supplemental_Information:
This GIS consists of two major ArcInfo datasets: one line and polygon file (ironmtn) containing geologic contacts and structures (lines) and geologic map rock units (polygons), and one point file (ironmtnp) containing structural data.
  1. How might this data set be cited?
    Howland, A.L., and Moyer, L.A., 2001, Chromite deposits in central part Stillwater Complex, Sweet Grass County, Montana: A digital database for the geologic map of the east slope of Iron Mountain: U.S. Geological Survey Open-File Report 01-321, U.S. Geological Survey, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -110.06
    East_Bounding_Coordinate: -110.05
    North_Bounding_Coordinate: 45.41
    South_Bounding_Coordinate: 45.40
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1955
    Currentness_Reference:
    Publication date of paper map.
  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?
      Grid_Coordinate_System_Name: State Plane Coordinate System
      State_Plane_Coordinate_System:
      SPCS_Zone_Identifier: 4526
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000004
      Ordinates (y-coordinates) are specified to the nearest 0.000004
      Planar coordinates are specified in Survey feet
      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.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    U.S. Geological Survey Open-File Report 01-321 contains a detailed description of each attribute code and a reference to the associated map symbols on the map source materials. The GIS includes a geologic linework arc attribute table, ironmtn.aat, that relates to the ironmtn.con (contact look-up table), ironmtn.st2 (structure look-up table), and the ironmtn.ref (source reference look-up table) files; a rock unit polygon attribute table, ironmtn.pat, that relates to the ironmtn.ru (rock unit look-up table) and ironmtn.ref (source reference look-up table) files; and a geologic map symbol point attribute table, ironmtnp.pat, that relates to the ironmtnp.sym (structural point data look-up tables) and ironmtnp.ref (source reference look-up table) files.
    Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/of/2001/0321/pdf/IRONMTN.PDF

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • A.L. Howland
    • L.A. Moyer
  2. Who also contributed to the data set?
    In 2000, the U.S. Geological Survey contracted Optronics Specialty Co., Inc. (Northridge, CA) to scan and vectorize the geologic map of the east slope of Iron Mountain (Howland, 1955, plate 10). Helen Z. Kayser (contractor) transformed the GIS provided by Optronics from scanner inches to a state plane coordinate system (Montana South). Lorre A. Moyer then edited and attributed the spatial digital data files with an interim geologic data model in 2001.
  3. To whom should users address questions about the data?
    Michael L. Zientek
    U.S. Geological Survey
    geologist
    904 W. Riverside Ave., Rm. 202
    Spokane, WA
    USA

    1-509-368-3105 (voice)
    1-509-368-3199 (FAX)
    mzientek@usgs.gov

Why was the data set created?

This dataset was developed to provide a geologic map GIS of the east slope of Iron Mountain, Sweet Grass County, Montana for use in future spatial analysis by a variety of users. These data can be printed in a variety of ways to display various geologic features or used for digital analysis and modeling. This database is not meant to be used or displayed at any scale larger than 1:3077 (for example, 1:2000 or 1:1500).

How was the data set created?

  1. From what previous works were the data drawn?
    Howland (1955) (source 1 of 1)
    Howland, A.L., 1955, Geologic map of the east slope of Iron Mountain, Sweet Grass County, Montana: U.S. Geological Survey Bulletin 1015-D, U.S. Geological Survey, Washington, D.C..

    Type_of_Source_Media: paper map
    Source_Scale_Denominator: 3077
    Source_Contribution:
    Howland (1955, plate 10) was the sole source of geologic information in this GIS.
  2. How were the data generated, processed, and modified?
    Date: 2000 (process 1 of 2)
    Optronics Specialty Co., Inc. (Northridge, CA) scanned and vectorized the geologic map of the east slope of Iron Mountain (Howland, 1955, plate 10). Helen Z. Kayser (contractor) transformed the GIS provided by Optronics from scanner inches to a state plane coordinate system (Montana South). Lorre A. Moyer then edited and attributed the spatial digital data files with an interim geologic data model.
    Date: 05-Dec-2001 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    U.S. Geological Survey
    Attn: Pamela D. Derkey
    geologist
    904 West Riverside Avenue, Rm 202
    Spokane, WA
    USA

    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, plots, and on-screen evaluation.
  2. How accurate are the geographic locations?
    The horizontal position accuracy for the digital data is no better than 15 feet based on the digitizing RMS error.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    All geologic units from Howland (1955, plate 10) are included in this GIS.
  5. How consistent are the relationships among the observations, including topology?
    Polygon and chain-node topology present. Segments making up the outer and inner boundaries of a polygon tie end-to-end to completely enclose the area. Line segments area set of sequentially numbered coordinate pairs. No duplicate features exist nor duplicate points in a data string. Intersecting lines are separated into individual line segments at the point of intersection. Point data are represented by two sets of coordinate pairs, each with the same coordinate values. All nodes are represented by a single coordinate pair which indicates the beginning or end of a line segment. The neatline was generated by mathematically generating the four sides of the quadrangle, densifying the lines of latitude and projecting the file to Montana State Plane zone 4526.

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 1:3077 (such as 1:2000).
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 US 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 Open-File Report 01-321
  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 makes 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 determining 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 use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by USGS.
    This digital geologic map GIS of the east slope of Iron Mountain, Sweet Grass County, Montana is not meant to be used or displayed at any scale larger than 1:3077 (for example, 1:2000).
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: Geologic units and structural features, along with ancillary data in format ARCE (version 8.0) Size: 8.3
      Network links: http://pubs.usgs.gov/of/2001/0321/ironmtn.tar.Z
    • Cost to order the data: none


Who wrote the metadata?

Dates:
Last modified: 10-Jun-2016
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:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://geo-nsdi.er.usgs.gov/metadata/open-file/01-321/metadata.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:05:42 2018