usSEABED EXTracted data for the Louisiana Region (LA_EXT)

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Frequently anticipated questions:


What does this data set describe?

Title: usSEABED EXTracted data for the Louisiana Region (LA_EXT)
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).
Supplemental_Information:
This data layer is a subset of the original usSEABED Gulf Coast data release version 1.0, and is geographically clipped to the Louisiana geographical region.
  1. How might this data set be cited?
    U.S. Geological Survey, 2007, usSEABED EXTracted data for the Louisiana Region (LA_EXT): Open-File Report 2006-1195, 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.

    Williams, S.J., Arsenault, M.A., Buczkowski, B.J., Reid, J.A., Flocks, J.G., Kulp, M.A., and Penland, S., 2007, Surficial Sediment Character of the Louisiana Offshore Continental Shelf Region: a GIS Compilation: Open-File Report 2006-1195, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -94.399440
    East_Bounding_Coordinate: -88.202000
    North_Bounding_Coordinate: 30.643000
    South_Bounding_Coordinate: 26.405000
  3. What does it look like?
    https://pubs.usgs.gov/of/2006/1195/browseimages/la_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: 2007
    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 (23928)
    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 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees. 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 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.
  7. How does the data set describe geographic features?
    la_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: source data)
    Range of values
    Minimum:Information unavailable from original metadata.
    Maximum:Information unavailable from original metadata.
    Units:decimal degrees
    LONGITUDE
    Longitude coordinate of sample location (Source: source data)
    Range of values
    Minimum:Information unavailable from original metadata.
    Maximum:Information unavailable from original metadata.
    Units:decimal degrees
    WATERDEPTH
    measured water depth for site (usually uncorrected) (Source: source data)
    Range of values
    Minimum:Information unavailable from original metadata.
    Maximum:Information unavailable from original metadata.
    Units:meters
    SAMPLETOP
    measured subbottom depth information for each point sample (Source: Information unavailable from original metadata.)
    Range of values
    Minimum:Information unavailable from original metadata.
    Maximum:Information unavailable from original metadata.
    Units:meters
    SAMPLEBASE
    measured subbottom depth information for each point sample (Source: Information unavailable from original metadata.)
    Range of values
    Minimum:Information unavailable from original metadata.
    Maximum:Information unavailable from original metadata.
    Units:meters
    SITENAME
    Survey or laboratory code for site (non-unique) (Source: Information unavailable from original metadata.) Information unavailable from original metadata.
    DATASETKEY
    Unique sequential numeric key to SRC file (Source: dbSEABED processing software) Information unavailable from original metadata.
    SITEKEY
    Unique sequential numeric key to SRC file (Source: dbSEABED processing software) Information unavailable from original metadata.
    SAMPLEKEY
    Unique sequential numeric key to SRC file (Source: dbSEABED processing software) Information unavailable from original metadata.
    SAMPLER
    Equipment used to collect samples (Source: Original data source) Information unavailable from original metadata.
    DATATYPES
    Type of data that were used to derive values held in characterization (Source: Information unavailable from original metadata.)
    ValueDefinition
    ACUAcoustic Properties
    CMPSediment Composition
    COLColor
    GTCGeotechnical Properties
    GRZGrain Size
    TXRTexture
    TXGTexture (Graphic)
    LTHLithology
    GRAVEL
    Gravel grainsize fraction (Source: Original data source)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:1
    SAND
    Sand grainsize fraction (Source: Original data source)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:1
    MUD
    Mud grainsize fraction (Source: Original data source)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:1
    CLAY
    Clay grainsize fraction (Source: Original data source)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    Resolution:1
    GRAINSIZE
    Phi characteristic grainsize (Source: Information unavailable from original metadata.)
    Range of values
    Minimum:-7.3
    Maximum:12
    Units:phi
    Resolution:0.1
    SORTING
    Phi grainsize dispersion; standard deviation sorting only (Source: Information unavailable from original metadata.)
    Range of values
    Minimum:0
    Maximum:6
    Units:phi
    Resolution:0.1
    SEABEDCLS
    Seabed class; (Facies) with the maximum Fuzzy Membership value > 30% (Source: dbSEABED processing software) Information unavailable from original metadata.
    CLSMSHP
    Class membership; fuzzy membership (%) of above Class (Facies) (Source: dbSEABED processing software) Information unavailable from original metadata.
    FOLKCODE
    Grainsize classification (Source: Folk, Andrews, and Lewis, 1970)
    ValueDefinition
    (g)Mslightly gravelly mud
    (g)mSslightly gravelly muddy sand
    (g)sMslightly gravelly sandy mud
    (g)Sslightly gravelly sand
    Ggravel
    gMgravelly mud
    gmSgravelly muddy sand
    gSgravelly sand
    Mmud
    mGmuddy gravel
    mSmuddy sand
    msGmuddy sandy gravel
    Ssand
    sGsandy gravel
    sMsandy mud
    SHEPARDCOD
    Shepard code; grain size classification (Source: Information unavailable from original metadata.)
    ValueDefinition
    CLAYEY SILTInformation unavailable from original metadata.
    SANDY SILTInformation unavailable from original metadata.
    SAND SILT CLAYInformation unavailable from original metadata.
    SILTY CLAYInformation unavailable from original metadata.
    SANDInformation unavailable from original metadata.
    SILTY SANDInformation unavailable from original metadata.
    SEDIMENTInformation unavailable from original metadata.
    CLAYEY SANDInformation unavailable from original metadata.
    CLAYInformation unavailable from original metadata.
    SANDY CLAYInformation unavailable from original metadata.
    SILTInformation unavailable from original metadata.
    GRAVELLY SEDIMENTInformation unavailable from original metadata.
    GRAVELInformation unavailable from original metadata.
    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: Information unavailable from original metadata.) Information unavailable from original metadata.
    MUNSLCODE
    Munsell color code (Source: GSA Rock-Color Chart, 1991) non-unique code based on HVC (Hue, Value, Chroma)
    ORGCARBON
    organic carbon in the sample (Source: Information unavailable from original metadata.)
    Range of values
    Minimum:0
    Maximum:100
    Units:percent
    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:Information unavailable from original metadata.
    Maximum:Information unavailable from original metadata.
    Units:percent
    PWAVEVEL
    Compressional wave velocity (Source: dbSEABED processing software)
    Range of values
    Minimum:Information unavailable from original metadata.
    Maximum:Information unavailable from original metadata.
    Units:meters/second
    ROUGHNESS
    A coded output representing the V:H of the roughness element with greatest aspect ratio (Source: dbSEABED processing software)
    Range of values
    Minimum:Information unavailable from original metadata.
    Maximum:Information unavailable from original metadata.
    Units:values expressed as (rounded) integer log2 of V and H in cm
    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: Information unavailable from original metadata.)
    Range of values
    Minimum:Information unavailable from original metadata.
    Maximum:Information unavailable from original metadata.
    Units:kPa
    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 sediment characters are being mapped. Only blank entries should be included in such a mapping.
    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
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Matthew A. Arsenault
    U.S. Geological Survey
    IT Specialist (Data Management)
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 548-8700 x2354 (voice)
    (508) 457-2310 (FAX)
    marsenault@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?
    Information unavailable from original metadata. (source 1 of 1)
    U.S. Geological Survey, and Colorado, University of, 2006, GMX_EXT: usSEABED EXTracted data for the Gulf of Mexico and Caribbean (Puerto Rico and U.S. Virgin Islands): Data Series 146, U.S. Geological Survey, Coastal and Marine Geology Program, Wooods 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, version 1.0: Data Series 146, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    See separate listing contained within the Larger_Work_Citation of the Source_Citation for specific sources and associated metadata
    Type_of_Source_Media: online
    Source_Contribution:
    point locations, descriptions and analytical data on many different types of sediment and rock materials and benthos for the entire Gulf coast
  2. How were the data generated, processed, and modified?
    Date: 2006 (process 1 of 5)
    The data contained in this report were clipped from the larger citation using the 'Select' tool in the ArcToolbox, and selected using the following criteria: "LATITUDE" >=26.405 and "LATITUDE" <=30.643 and "LONGITUDE" <=-88.2020 and "LONGITUDE" >=-94.39667 Person who carried out this activity:
    Matthew A. Arsenault
    U.S. Geological Survey
    IT Specialist (Data Management)
    384 Woods Hole Rd
    Woods Hole, MA
    USA

    508-548-8700 x2354 (voice)
    508-457-2310 (FAX)
    marsenault@usgs.gov
    Data sources used in this process:
    • GMX_EXT
    Data sources produced in this process:
    • LA_EXT
    Date: 20-Oct-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.). Reordered the links in the identification section so a landing page link is first. Attempted to modify http to https where appropriate. Some attributes were incompletely defined and had to be modified to meet the standard. Modified the browse graphic to point to the image of this dataset. 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: 20-Jul-2018 (process 3 of 5)
    USGS Thesaurus keywords added to the keyword section. 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: 18-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?
    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, version 1.0: Data Series 146, U.S. Geological Survey, Reston, VA.

    Online Links:


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)
    Matthew A. Arsenault
    U.S. Geological Survey
    IT Specialist (Data Management)
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    (508) 548-8700 x2354 (voice)
    (508) 457-2310 (FAX)
    marsenault@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: 19.1
      Network links: https://pubs.usgs.gov/of/2006/1195/data/usseabed/la_ext.txt
      Media you can order: CD-ROM (Density 650 Mbytes) (format ISO 9660 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 Shapefile
      Network links: https://pubs.usgs.gov/of/2006/1195/data/usseabed/la_ext.zip
      https://pubs.usgs.gov/ofr/2006/1195/htmldocs/data_catalog.htm
      Media you can order: CD-ROM (Density 650 Mbytes) (format ISO 9660 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:
Matthew A. Arsenault
U.S. Geological Survey
IT Specialist (Data Management)
384 Woods Hole Rd.
Woods Hole, MA
USA

(508) 548-8700 x2354 (voice)
(508) 457-2310 (FAX)
marsenault@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/open_file_report/ofr2006-1195/la_extmeta.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:20:22 2021