Digital geologic map of the Spokane 1:100,000 quadrangle, Washington and Idaho: a digital database for the 1990 N.L. Joseph map

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Frequently anticipated questions:

What does this data set describe?

Title:
Digital geologic map of the Spokane 1:100,000 quadrangle, Washington and Idaho: a digital database for the 1990 N.L. Joseph map
Abstract:
Geologic data from the geologic map of the Spokane 1:100,000-scale quadrangle compiled by Joseph (1990) were entered into a geographic information system (GIS) as part of a larger effort to create regional digital geology for the Pacific Northwest. The map area is located in eastern Washington and extendds across the state border into western Idaho.
  1. How might this data set be cited?
    Johnson, Bruce R., and Derkey, Pamela D., 1998, Digital geologic map of the Spokane 1:100,000 quadrangle, Washington and Idaho: a digital database for the 1990 N.L. Joseph map: U.S. Geological Survey Open-File Report 98-115.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -118.0
    East_Bounding_Coordinate: -117.0
    North_Bounding_Coordinate: 48.0
    South_Bounding_Coordinate: 47.5
  3. What does it look like?
    http://pubs.usgs.gov/of/1998/0115/pdf/98-115.pdf (PDF)
    PDF representation of map and pamphlet
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1998
    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):
      • Entity point
      • Complete chain
      • GT-polygon composed of chains
    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
      Abscissae (x-coordinates) are specified to the nearest unknown
      Ordinates (y-coordinates) are specified to the nearest unknown
      Planar coordinates are specified in meters
  7. How does the data set describe geographic features?
    SPOK100K.PAT
    Geologic map units (Source: OFR-98-115)
    UNIT
    Numeric code used to identify the geologic unit which is described in the SPOK100K.RU look-up table (Source: OFR-98-115)
    Range of values
    Minimum:1
    Maximum:200
    SOURCE
    Numeric code used to identify the data source for the area (polygon) feature. Complete references for the sources are listed in the SPOK100K.REF file. (Source: OFR-98-115)
    Range of values
    Minimum:0
    Maximum:10
    SPOK100K.AAT
    Linear features on geologic map (Source: OFR-98-115)
    LINECODE
    Numeric code used to identify type of linear feature. Linecodes <100 are used for contacts and boundaries which are descripbed in the SPOK100K.CON file. Linecodes >100 are <60 represent structural features which are described in the SPOK100K.STR file. Linecodes >800 represent linear geologic units which are described in the SPOK100K.LGU file. (Source: OFR-98-115)
    Range of values
    Minimum:1
    Maximum:801
    SOURCE
    Numeric code used to identify the data source for the linear feature. Complete references for the sources are listed in the SPOK100K.REF file. (Source: OFR-98-115)
    Range of values
    Minimum:0
    Maximum:10
    SPOK100K.PAT
    Geologic map unit at specific localities (same attributes as polygon coverage SPOK100K.PAT) (Source: OFR-98-115)
    SPOKPNT.PAT
    Bedding attributes (Source: OFR-98-115)
    SYMBOL
    Marker symbol number used by ARC/INFO type of geologic map symbol which is described in SPOKPNT.SYM look-up table. Symbol numbers refer to the ALCGEOL.MRK markerset. (Source: OFR-98-115)
    Range of values
    Minimum:1
    Maximum:33
    GSMAP_SYMBOL
    Numeric code used by the GSMAP progarm to identify map symbols (Source: OFR-98-115)
    Range of values
    Minimum:201
    Maximum:241
    STRIKE
    Strike of bedding or foliation, bearing of lineation, or sample number. Sample number may refer to a rock sample used forgeochemical analysis or radiometric age dating. (Source: OFR-98-115)
    Range of values
    Minimum:0
    Maximum:359
    Units:degrees
    Resolution:1
    DIP
    Dip of bedding or plunge of foliation. (Source: OFR-98-115)
    Range of values
    Minimum:0
    Maximum:80
    Units:degrees
    Resolution:1
    CALCANG
    An interim value used in calculation alc$angle. Calcang = strike-270 (Source: OFR-98-115)
    Range of values
    Minimum:-99
    Maximum:260
    Units:degrees
    Resolution:1
    ALC$ANGLE
    The angle used to mathematically rotate the symbol to its proper position on a map plot. This value equals the $angle pseuydoitem value for the symbol. ALC$ANGLE=0-CALCANG (Source: OFR-98-115)
    Range of values
    Minimum:-260
    Maximum:167
    Units:degrees
    Resolution:1

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Bruce R. Johnson
    • Pamela D. Derkey
  2. Who also contributed to the data set?
    We wish to thank Robert E. Derkey and J. Eric Schuster of the Washington Division of Geology and Earth Resources for their part in initiating this project, and for providing the original stable-base mylar and the funding for it to be scanned.
  3. To whom should users address questions about the data?
    Johnson, Bruce R
    USGS-GEO-ERG-MRS
    Mail Stop 954, USGS
    12201 Sunrise Valley Drive
    Reston, VA
    US

    703-648-6051 (voice)
    bjohnson@usgs.gov

Why was the data set created?

To create a digital geologic map of the Spokane 1:100,000-scale quadrangle that is readily available to the public/

How was the data set created?

  1. From what previous works were the data drawn?
    Joseph (1990) (source 1 of 1)
    Joseph, N.L., 1990, Geologic map of the Spokane 1:100,000 quadrange, Washington-Idaho: Washington Division of Geology and Earth Resources Open-File Report 90-17.

    Other_Citation_Details: 29 pages, 1 plate
    Type_of_Source_Media: Paper
    Source_Scale_Denominator: 100,000
    Source_Contribution: Sole source of geologic data
  2. How were the data generated, processed, and modified?
    Date: 1990 (process 1 of 2)
    The original stable-base mylar of the geologic linework for the 1:100,000-scale geologic map was electronically scanned to create a raster digital image. The resulting TIFF-formate image (600 do per inch resolution) was registered to a UTM grid and rectified in Arc/Info. The rectified raster image was then converted to a vector GIS layer using the GRIDLINE vectorization tool included in the Arc/Info GRID extension. Subsequent clean-up of the vector layer was done in PC Arc/Info. Linework for water bodies that obscured geologic contact was converted from digital line graph (DLG) formate files to PC Arc/Info so as to delineate discrete geologic unit boundaries. The resulting geologic map was attributed, converted to Arc/Info, and then plotted and compared to the original mylar to check for digitizing and attributing errors.
    Date: 28-Jul-2000 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    Jennifer Lenz
    US Geological Survey
    12201 Surise Valley Drive, Mail Stop 918
    Reston, VA
    USA

    703-648-6974 (voice)
    703-648-6560 (FAX)
    pschweitzer@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?
  2. How accurate are the geographic locations?
    The overall accurace of the digital geologic map is probably no better than +/- 70 meters.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Complete
  5. How consistent are the relationships among the observations, including topology?
    Joseph (1990) was the sole source of geologic data used to create the digital map.

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: None
  1. Who distributes the data set? (Distributor 1 of 1)
    USGS Information Services
    Box 25286, Denver Federal Center
    Denver, Colorado
    USA

    1-888-ASK-USGS (voice)
    1-303-202-4695 (FAX)
    infoservices@usgs.gov
  2. What's the catalog number I need to order this data set? US Geological Survey Open-File Report 98-115
  3. What legal disclaimers am I supposed to read?
    This report is preliminary and has not been reviewed for conformity with US Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the US Government.
  4. How can I download or order the data?

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/98-115/metadata.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:07:06 2018