usSEABED EXTracted data for the entire U.S. Gulf of Mexico and Caribbean (GMX_EXT, Puerto Rico and U.S. Virgin Islands)

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

Frequently anticipated questions:

What does this data set describe?

Title:
usSEABED EXTracted data for the entire U.S. Gulf of Mexico and Caribbean (GMX_EXT, Puerto Rico and U.S. Virgin Islands)
Abstract:
This data layer is a point coverage of known sediment samplings, inspections and probings from the usSEABED data collection and integrated using the software system dbSEABED. This data layer represents the extracted (EXT) output of the dbSEABED mining software. It contains data items which were simply extracted from the data resources through data mining. The EXT data is usually based on instrumental analyses (probe or laboratory) but may apply to just a subsample of the sediment (eg. no large shells).
  1. How might this data set be cited?
    U.S. Geological Survey, and Colorado, University of, 2006, usSEABED EXTracted data for the entire U.S. Gulf of Mexico and Caribbean (GMX_EXT, Puerto Rico and U.S. Virgin Islands): Data Series 146, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Buczkowski, B.J., Reid, J.A., Jenkins, C.J., Reid, J.M., Williams, S.J., and Flocks, J.G., 2006, usSEABED: Gulf of Mexico and Caribbean (Puerto Rico and U.S. Virgin Islands) Offshore Surficial Sediment Data Release: Data Series 146, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -97.731850
    East_Bounding_Coordinate: -63.800000
    North_Bounding_Coordinate: 30.808300
    South_Bounding_Coordinate: 16.666670
  3. What does it look like?
    https://pubs.usgs.gov/ds/2006/146/data/gmx_ext.jpg (JPEG)
    Image map showing extent of data layer coverage
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2006
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector digital data
  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 (51289)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
  7. How does the data set describe geographic features?
    gmx_ext
    Shapefile Attribute Table (Source: ESRI)
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    LATITUDE
    Latitude coordinate of sample location (Source: USGS)
    Range of values
    Minimum:16.66667
    Maximum:30.80830
    Units:decimal degrees
    Resolution:.00001
    LONGITUDE
    Longitude coordinate of sample location (Source: USGS)
    Range of values
    Minimum:-97.73185
    Maximum:-63.80000
    Units:decimal degrees
    Resolution:.00001
    WATERDEPTH
    measured water depth for site (usually uncorrected) (Source: USGS)
    ValueDefinition
    -99Data are not available
    Range of values
    Minimum:0
    Maximum:6770
    Units:meters
    Resolution:1
    SAMPLETOP
    measured subbottom depth information for each point sample (Source: USGS)
    Range of values
    Minimum:0
    Maximum:653.00
    Units:meters
    Resolution:0.01
    SAMPLEBASE
    measured subbottom depth information for each point sample (Source: USGS)
    Range of values
    Minimum:0
    Maximum:655.00
    Units:meters
    Resolution:0.01
    SITENAME
    Survey or laboratory code for site (non-unique) (Source: USGS) Character String
    DATASETKEY
    Unique sequential numeric key to SRC file (Source: dbSEABED processing software)
    Range of values
    Minimum:1
    Maximum:538
    Units:integer count
    Resolution:1
    SITEKEY
    Unique sequential numeric key to SRC file (Source: dbSEABED processing software)
    Range of values
    Minimum:1
    Maximum:44241
    Units:integer count
    Resolution:1
    SAMPLEKEY
    Unique sequential numeric key to SRC file (Source: dbSEABED processing software)
    Range of values
    Minimum:1
    Maximum:82238
    Units:integer count
    Resolution:1
    SAMPLER
    Equipment used to collect samples (Source: USGS) Character String
    DATATYPES
    Type of data that were used to derive values held in characterization (Source: USGS)
    ValueDefinition
    ACUAcoustic Properties
    CMPSediment Composition
    COLColor
    GTCGeotechnical Properties
    GRZGrain Size
    TXRTexture
    TXGTexture (Graphic)
    LTHLithology
    GRAVEL
    Gravel grainsize fraction (Source: USGS)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:1
    SAND
    Sand grainsize fraction (Source: USGS)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:1
    MUD
    Mud grainsize fraction (Source: USGS)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:1
    CLAY
    Clay grainsize fraction (Source: USGS)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:1
    GRAINSIZE
    Phi characteristic grainsize (Source: USGS)
    Range of values
    Minimum:-7.3
    Maximum:12
    Units:phi
    Resolution:0.1
    SORTING
    Phi grainsize dispersion; standard deviation sorting only (Source: USGS)
    Range of values
    Minimum:0
    Maximum:6
    Units:phi
    Resolution:0.1
    LGCRSHST
    Log Critical Shear Stress, Log10 of Tau in kPa, being the Shear Stress required to initiate easily observable erosion and transport, whether by traction or suspension (Source: USGS)
    ValueDefinition
    -99no data available
    Range of values
    Minimum:9999
    Maximum:9999
    Units:kPa
    Resolution:1
    SAMPLEPHAS
    Sample Phase; records whether the results are for the whole, bulk sediment or just to some special part (Source: dbSEABED processing software) Output as a word-based description that may involve numerics. This field will need to be selected against when GIS mappings of the bulk sedient characters are being mapped. Only blank entries should be included in such a mapping.
    FOLKCODE
    modified Folk classification scheme (Source: USGS)
    ValueDefinition
    <blank>unclassified
    (g)Mslightly gravelly mud
    (g)mSslightly gravelly muddy sand
    (g)Sslightly gravelly sand
    (g)sMslightly gravelly sandy mud
    Ggravel
    gMgravelly mud
    gmSgravelly muddy sand
    gSgravelly sand
    Mmud
    mGmuddy gravel
    mSmuddy sand
    msGmuddy sandy gravel
    Ssand
    sGsandy gravel
    sMsandy mud
    SEABEDCLS
    Seabed class; (Facies) with the maximum Fuzzy Membership value > 30% (Source: dbSEABED processing software) Character String
    CLSMSHP
    Class membership; fuzzy membership (%) of above Class (Facies) (Source: dbSEABED processing software)
    ValueDefinition
    -99no data available
    ROCKMSHP
    Rock membership; fuzzy membership (%) reflecting percent exposure of rock (Source: dbSEABED processing software)
    ValueDefinition
    -99no data
    WEEDMSHP
    Weed membership; fuzzy membership (%) reflecting percent abundance of seaweed and seagrass (Source: dbSEABED processing software)
    ValueDefinition
    -99no data
    CARBONATE
    Carbonate, including finest to coarsest sampled fractions (Source: USGS) Character String
    MUNSLCODE
    Munsell color code (Source: GSA Rock-Color Chart, 1991) Character string containing non-unique code based on HVC (Hue, Value, Chroma)
    ORGCARBON
    organic carbon in the sample (Source: USGS)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:1
    LGSHEARSTR
    Undrained compressive shear strength, Log10 of KiloPascals (Source: dbSEABED processing software)
    ValueDefinition
    -99no data
    POROSITY
    Void volume (Source: dbSEABED processing software)
    Range of values
    Minimum:-10
    Maximum:102
    Units:percent
    Resolution:1
    PWAVEVEL
    Compressional wave velocity (Source: dbSEABED processing software)
    Range of values
    Minimum:1405
    Maximum:1902
    Units:meters/second
    Resolution:1
    ROUGHNESS
    A coded output representing the V:H of the roughness element with greatest aspect ratio (Source: dbSEABED processing software) Character string with values expressed as (rounded) integer log2 of V and H in cm
    SHEPARDCOD
    modified Shephard classification scheme (Source: USGS)
    ValueDefinition
    CLAYsediment whose main phase is <4 microns (usually >50%)
    CLAYEY SILTsediment whose main phase is silt (>50%) with significant clay
    GRAVELsediment whose main phase is >2 mm ( ususlly >50%)
    GRAVELLY SEDIMENTsediment with significant amounts of gravel (>10%, but <50%)
    SANDsediment whose main phase is <2 mm, but >.062 mm
    SAND SILT CLAYsediment with sand, silt, and clay concentrations all >20%
    SANDY CLAYsediment whose main phase is clay (>50%) with significant sand
    SANDY SILTsediment whose main phase is silt (>50%) with significant sand
    SEDIMENTInformation unavailable from original metadata.
    SILTsediment whose main phase is <0.62 mm, but >4 microns
    SILTY CLAYsediment whose main phase is clay (>50%) with significant silt
    SILTY SANDsediment whose main phase is sand (>50%) with significant silt
    Entity_and_Attribute_Overview:
    Values of -99 for any field are indications that there was no data available.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
    • University of Colorado
  2. Who also contributed to the data set?
    We thank the following interns for their assistance in data entry, coding, and data testing: Viness Ubert, Emma Mitchell, Emily Denham ,Shea Quinn and Ariadne Prior-Grosch.
  3. To whom should users address questions about the data?
    Brian Buczkowski
    U.S. Geological Survey
    Core Curator and Data Management Specialist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2361 (voice)
    (508) 457-2310 (FAX)
    bbuczkowski@usgs.gov

Why was the data set created?

To build a digital mapping of the character of the seabed on regional, national and global scales. 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?
    See separate listing within this publication for specific sources and associated metadata (source 1 of 1)
    varous, unknown, See separate listing, GMX_SRC.txt, contained within the Larger_Work_Citation for specific sources and associated metadata.

    Other_Citation_Details:
    X number of sources, both published and unpublished, are used as the sources of information for usSEABED. Metadata for each source is linked through the usSEABED source file (GMX_SRC.txt). Sources include the U.S. Geological Survey (USGS), the U.S. Army Corps of Engineers (USACE), Minerals Management Service (MMS), National X number of sources, both published and unpublished, are used as the sources of information for usSEABED. Metadata for each source is linked through the usSEABED source file (GMX_SRC.txt). Sources include the U.S. Geological Survey (USGS), the U.S. Army Corps of Engineers (USACE), Minerals Management Service (MMS), National Oceanic and Atmospheric Administration (NOAA), Virginia Institute of Marine Science (VIMS), the Maryland and New Jersey State Geological Surveys (MGS, NJGS), NOAA's National Geophysical Data Center (NGDC), the Smithsonian Institution, and others.
    Type_of_Source_Media: various
    Source_Contribution:
    point locations, descriptions and analytical data on many different types of sediment and rock materials and benthos
  2. How were the data generated, processed, and modified?
    Date: 2006 (process 1 of 5)
    Please review the Larger_Work_Citation for information about how the data are compiled, integrated, and processed in the usSEABED database. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Brian Buczkowski
    Core Curator and Data Management Specialist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2361 (voice)
    (508) 457-2310 (FAX)
    bbuczkowski@usgs.gov
    Data sources used in this process:
    • GMX_EXT.txt
    Data sources produced in this process:
    • gmx_ext.dbf
    • gmx_ext.shp
    • gmx_ext.shx
    Date: 26-Jan-2017 (process 2 of 5)
    Edits to the metadata were made to fix any errors that MP v 2.9.36 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). The source information was incomplete and had to be modified to meet the standard. In attributes with range domains, a value of 9999 was entered in the minimum and maximum values to indicate the original metadata did not contain the required information. Minor fixes to the attribute format for some attributes were needed. Attempted to modify http to https where appropriate. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 26-Apr-2018 (process 3 of 5)
    Keywords added to metadata support discovery in the USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@usgs.gov
    Date: 15-Nov-2019 (process 4 of 5)
    Crossref DOI link was added as the first link in the metadata. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 08-Sep-2020 (process 5 of 5)
    Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@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?
    Accuracy of each attribute is dependent on the accuracy of the lineage data.
  2. How accurate are the geographic locations?
    Locational accuracy is dependent on the accuracy of the navigational technique from the individual data sources and may vary widely (e.g., from 0.005km (differential GPS) in more recent surveys to greater than 2 km based on radar, Loran, or dead reckoning in older surveys.) Users of the data should use their own criteria for assessing the accuracy of the locations.
  3. How accurate are the heights or depths?
    Locational accuracy is dependent on the accuracy of the navigational technique from the individual data sources. Users of the data should use their own criteria for assessing the accuracy of the locations.
  4. Where are the gaps in the data? What is missing?
    Additional useable data may exist in this area; the authors appreciate any information and leads.
  5. How consistent are the relationships among the observations, including topology?
    Data in usSEABED are based on the observations and analyses of others, filtered through a unifying and mining software. Each source report varies in type of information/data recorded and format. Only those observations that are recorded can be filtered and mined; only presence (not absence) or information can be noted.

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:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
  1. Who distributes the data set? (Distributor 1 of 1)
    Brian Buczkowski
    U.S. Geological Survey
    Core Curator and Data Management Specialist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2361 (voice)
    (508) 457-2310 (FAX)
    bbuczkowski@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable Data
  3. What legal disclaimers am I supposed to read?
    Although this data set has been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: Text file containing data input to usSEABED. Fields are comma separated values. First record of file contains field names. in format ASCII Size: 6.61
      Network links: https://pubs.usgs.gov/ds/2006/146/data/gmx_ext.txt
      https://pubs.usgs.gov/ds/2006/146/htmldocs/data_cata.htm
      Media you can order: CD-ROM (Density 650 Mbytes) (format ISO and HFS)
      Data format: The SHP file contains the geospatial data. The SHX file contains the index of the geospatial data. The DBF file contains the attribute data in dBASE format. The PRJ file contains the coordinate system information (optional). The AVL file contains the legend information (optional). The SBN and SBX files contain the spatial index of the geospatial data (optional). The XML file contains the metadata describing the data set <data set name>.shp.xml. An ASCII version of the metadata file. A browse graphic showing the data layer coverage and extent (optional). in format SHP (version 3.3) ESRI point shapefile
      Network links: https://pubs.usgs.gov/ds/2006/146/data/gmx_ext.zip
      https://pubs.usgs.gov/ds/2006/146/htmldocs/data_cata.htm
      Media you can order: CD-ROM (Density 650 Mbytes) (format ISO and HFS)
    • Cost to order the data: None

  5. What hardware or software do I need in order to use the data set?
    These data are available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, arcexplorer, capable of displaying the data is available from ESRI at www.esri.com.

Who wrote the metadata?

Dates:
Last modified: 08-Sep-2020
Metadata author:
Brian Buczkowski
U.S. Geological Survey
Core Curator and Data Management Specialist
384 Woods Hole Rd.
Woods Hole, MA

(508) 548-8700x2361 (voice)
(508) 457-2310 (FAX)
bbuczkowski@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/data_series/DS-146/gmx_ext.shp.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:20:13 2021