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Digital geologic map of the Sandpoint 1- by 2-degree quadrangle, Washington, Idaho, and Montana

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:


What does this data set describe?

Title:
Digital geologic map of the Sandpoint 1- by 2-degree quadrangle, Washington, Idaho, and Montana
Abstract:
The geology of the Sandpoint 1:250,000 quadrangle, Washington, Idaho, and Montana was mapped by F.K. Miller, R.F. Burmester, D.M. Miller, and R.E. Powell between 1963 and 1995 onto a scale-stable 1:250,000 topographic map base and subsequently input into an Arc/Info geographic information system (GIS) by P.D. Derkey. The digital geologic map database can be queried in many ways to produce a variety of derivative geologic maps.
Supplemental_Information:
This GIS consists of one major Arc/Info dataset: a line and polygon file (sand250k) containing geologic contacts and structures (lines) and geologic map rock units (polygons and lines).
  1. How should this data set be cited?

    Miller, Fred K., Burmester, Russell F., Miller, David M., Powell, Robert E., and Derkey, Pamela D., 1999, Digital geologic map of the Sandpoint 1- by 2-degree quadrangle, Washington, Idaho, and Montana: U.S. Geological Survey Open-File Report 99-144, U.S. Geological Survey, Spokane WA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -118.0
    East_Bounding_Coordinate: -116.0
    North_Bounding_Coordinate: 49.0
    South_Bounding_Coordinate: 48.0

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 1999
    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?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • Point (6929)
      • String (16801)
      • GT-polygon composed of chains (6930)

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 11
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -117
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      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.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    The 'Digital geologic map of the Sandpoint 1:250,000 quadrangle, Washington, Idaho, and Montana' Open-File Report 99-xxx text 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, sand250k.aat, that relates to the sand250k.con (contact look-up table), sand250k.str (structure look-up table), sand250k.lgu (linear geologic unit look-up table) and sand250k.sr1 and sand250k.sr2 (source reference look-up tables) files; a rock unit polygon attribute table, sand250k.pat, that relates to the sand250k.ru (rock unit look-up table) and the sand250k.sr1 and sand250k.sr2 (source reference look-up tables) files.
    Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/of/1999/0144/of99-144_text.pdf


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    F.K. Miller, R.F. Burmester, D.M. Miller and R.E. Powell mapped the geology onto stable-base material; Optronics Specialty Co., Inc. scanned the geologic map and provided minimally attributed Arc/Info interchange-format files to the USGS; Pamela D. Derkey (USGS) imported the files in Arc/Info, transformed them to UTM zone 11 (with a y-shift) and attached and attributed an interim geologic map data model.

  3. To whom should users address questions about the data?

    Fred K. Miller
    U.S. Geological Survey
    geologist
    904 W. Riverside Ave., Rm. 202
    Spokane, WA 99201
    USA

    1-509-368-3121 (voice)
    1-509-353-0505 (current 3/99) 1-509-368-3199 (effective mid-1999) (FAX)
    fmiller@usgs.gov


Why was the data set created?

This dataset was developed to provide geologic map GIS of the Sandpoint 1:250,000 quadrangle for use in 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).


How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    Date: 1997 (process 1 of 3)
    Geologic map information was compiled from field sheets on to a stable-base copy of the USGS Sandpoint 1:250,000-scale topographic quadrangle map and manually labeled.
    Stable-base map was scanned and converted from a raster to a vector format (in scanner units).
    Digital files were transformed to UTM zone 11 (meters), with a RMS error (input,output) = (0.004, 24.177), and attributed using an interim geologic map data model. The data were checked for position by comparing plots of the digital data to the source.

    Date: 08-Jun-2012 (process 2 of 3)
    Modification to metadata on the occasion of this publication being moved from geopubs.wr.usgs.gov to pubs.usgs.gov web address, updated Online_Linkage in Citation, added Standard_Order_Process for the digital file download package.

    Person who carried out this activity:

    Peter N Schweitzer
    USGS ER GD
    Geologist
    12201 Sunrise Valley Drive
    Reston, VA 20192-0002
    USA

    703-648-6533 (voice)
    703-648-6252 (FAX)
    pschweitzer@usgs.gov

    Date: 08-Jun-2012 (process 3 of 3)
    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 99201
    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 and plots.

  2. How accurate are the geographic locations?

    The horizontal positional accuracy for the digital data is no better than +/- 24 meters based on the transformation RMS error. It was tested by visual comparison of the source with hard copy plots.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    All geologic units were mapped in the field at scales ranging from 1:24,000 to 1:62,500 and compiled at a scale of 1:250,000. In general, the minimum mapping unit is from 1 to 3 acres. Some small units and those obscured by dense forest cover may not be included in this dataset.

  5. How consistent are the relationships among the observations, including topology?

    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 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 UTM zone 11 (with a y-shift).


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
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 or 1:24,000).
Any hardcopies utilizing this data set shall clearly indicate its 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, 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)

    U.S. Geological Survey Information Services
    Open-File Reports, Box 25286
    Denver, CO 80225
    USA

    1-303-202-4200 (voice)
    1-303-202-4693 (FAX)

  2. What's the catalog number I need to order this data set?

    USGS Open-File Report 99-144

  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 Sandpoint 1:250,000 quadrangle, Washington, Idaho, and Montana 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: 31-Jul-2014
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Geologist
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA 20192-0002
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov

Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


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