Sediment thickness grid of the deep-sea basins offshore of Washington, Oregon, and California (cowthkg.tif) based on data collected in 1984

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Frequently anticipated questions:


What does this data set describe?

Title:
Sediment thickness grid of the deep-sea basins offshore of Washington, Oregon, and California (cowthkg.tif) based on data collected in 1984
Abstract:
Cowthkg.tif is a 1000-m resolution grid of sediment thickness derived from contours (cowiso.shp, also in this data set) from 1:1,000,000-scale Map Showing Sediment Isopachs in the Deep-sea Basins of the Pacific Continental Margin, Strait of Juan de Fuca to Point Loma, California (Gardner and others, 1992, 1993a, 1993b). The maximum sediment thickness in this region is 2342 m with a mean value of 359 m.
Supplemental_Information:

References cited

Gardner, J V; Cacchione, D A; Drake, D E; Edwards, B D; Field, M E; Hampton, M A; Karl, H A; Kenyon, N H; Masson, D G; McCulloch, D S; Grim, M S, 1992, Map showing sediment isopachs in the deep-sea basins of the Pacific continental margin, Point Conception to Point Loma: U. S. Geological Survey Miscellaneous Investigations Series I-2089-A, 1 sheet, scale 1:1,000,000; -126, 30, -117, 35.

Gardner, J V, Cacchione, D A, Drake, D E, Edwards, B D, Field, M E, Hampton, M A, Karl, H A, Kenyon, N H, Masson, D G, McCulloch, D S, Grim, M S, 1993a, Map showing sediment isopachs in the deep-sea basins of the Pacific continental margin, Cape Mendocino to Point Conception: U. S. Geological Survey Miscellaneous Investigations Series I-2090-A, 1 sheet, scale 1:1,000,000; -129, 34, -117, 41.

Gardner, J V; Cacchione, D A; Drake, D E; Edwards, B D; Field, M E; Hampton, M A; Karl, H A; Kenyon, N H; Masson, D G; McCulloch, D S; Grim, M S, 1993b, Map showing sediment isopachs in the deep-sea basins of the Pacific continental margin, Strait of Juan de Fuca to Cape Mendocino: U. S. Geological Survey Miscellaneous Investigations Series I-2091-A, 1 sheet, scale 1:1,000,000; -132, 40, -122, 49.

Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
  1. How might this data set be cited?
    Wong, Florence L., and Grim, Muriel S., 2015, Sediment thickness grid of the deep-sea basins offshore of Washington, Oregon, and California (cowthkg.tif) based on data collected in 1984: U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Santa Cruz and Menlo Park, CA.

    This is part of the following larger work.

    Wong, Florence L., and Grim, Muriel S., 2015, Depth-to-basement, sediment-thickness, and bathymetry data for the Deep-Sea Basins offshore of Washington, Oregon, and California: U.S. Geological Survey Open-File Report OF 2015-1118, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -131.4230
    East_Bounding_Coordinate: -118.0585
    North_Bounding_Coordinate: 48.4442
    South_Bounding_Coordinate: 30.4879
  3. What does it look like?
    https://pubs.usgs.gov/of/2015/1118/cowthkg.jpg (JPEG)
    preview image of report
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1984
    Currentness_Reference: ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: raster digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 1978 x 992 x 1, type Grid Cell
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 10
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -123.0
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000.0
      False_Northing: 0.0
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 1000.0
      Ordinates (y-coordinates) are specified to the nearest 1000.0
      Planar coordinates are specified in Meter
      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    Attribute Table
    Table containing attribute information associated with the data set. (Source: Producer defined)
    Value
    sediment thickness (Source: Producer defined)
    Range of values
    Minimum:0
    Maximum:2342
    Units:meter
    Entity_and_Attribute_Overview:
    Cell Size =       1000.000    Data Type:  Floating Point
    Number of Rows    =   1978
    Number of Columns =    992
    
     BOUNDARY  STATISTICS
    
    Xmin =    -126063.285    Minimum Value =      0.000
    Xmax =     865936.715    Maximum Value =   2342.251
    Ymin =    3390967.315    Mean =             359.134
    Ymax =    5368967.315    Standard Deviation =    375.115
    
     COORDINATE SYSTEM DESCRIPTION
    
    Projection   UTM
    Zone          10
    Datum      WGS84
    Units     METERS
    Spheroid   WGS84
    
    Entity_and_Attribute_Detail_Citation: none

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?
  3. To whom should users address questions about the data?
    Florence L. Wong
    U.S. Geological Survey
    Geologist, GIS Coordinator
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5327 (voice)
    (650) 329-5190 (FAX)
    fwong@usgs.gov

Why was the data set created?

These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) software to display geologic and oceanographic information.

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: 2010 (process 1 of 1)
    
    
    A 1000-m grid was constructed from the following inputs to ArcGIS TopoToRaster tool: (1) digital contours from construction of 1992-1993 sediment thickness maps (cowiso.shp, also in this data set), and (2) points with value 0 enclosed by outlines of "outcrop."
    
    CONTOUR cowiso.shp INCREM
    POINT outcroppt.shp GRID_CODE
    ENFORCE OFF
    DATATYPE CONTOUR
    ITERATIONS 40
    ROUGHNESS_PENALTY 0.00000000000
    DISCRETE_ERROR_FACTOR 1.00000000000
    VERTICAL_STANDARD_ERROR 0.00000000000
    TOLERANCES 2.50000000000 100.00000000000
    CELL_SIZE 1000.00000000000
    MARGIN 20
    
    
    TopoToRaster interpolation produced negative thicknesses, which were recalculated to 0. Final grid was clipped to extent of source contours.
  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?
    Not determined.
  2. How accurate are the geographic locations?
    Contour data (cowiso.shp, 100-m interval from 0 to 2300 m) from which this grid was generated have a displacement of as much as 10km.
  3. How accurate are the heights or depths?
    The contours of sediment thickness from which this grid was derived may vary as much as 10 percent throughout the range of seismic-reflection travel times
  4. Where are the gaps in the data? What is missing?
    Complete
  5. How consistent are the relationships among the observations, including topology?
    Attributes mean the same thing throughout the data set.

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:
These data are not to be used at scales greater than 1:500,000.

This information is not intended for navigational purposes.

Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data.

Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.

This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.

Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey (USGS) Coastal and Marine Geology (CMG)
    Attn: Florence L. Wong
    Geologist, GIS Coordinator
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA
    USA

    (650) 329-5327 (voice)
    (650) 329-5190 (FAX)
    fwong@usgs.gov
  2. What's the catalog number I need to order this data set? cowiso_tif.zip
  3. What legal disclaimers am I supposed to read?
    This information is not intended for navigational purposes.
    
    
    This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
    
    
    Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: Apr-2015
Last Reviewed: Apr-2014
Metadata author:
U.S. Geological Survey
Attn: Florence L. Wong
Geologist, GIS Coordinator
USGS, MailStop 999, 345 Middlefield Road
Menlo Park, CA
USA

(650) 329-5327 (voice)
(650) 329-5190 (FAX)
fwong@usgs.gov
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.9.32 on Mon Jun 22 13:17:28 2015