Oceanographic Observations made adjacent to the Chandeleur Islands, Louisiana, July-November, 2010

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Frequently anticipated questions:


What does this data set describe?

Title:
Oceanographic Observations made adjacent to the Chandeleur Islands, Louisiana, July-November, 2010
Abstract:
A program to measure waves, water levels, and currents near the Chandeleur Islands, Louisiana and adjacent berm construction site was conducted by the U.S. Geological Survey (USGS) during Summer and Autumn 2010. The Chandeleur Islands have been the subject of ongoing USGS studies of coastal erosion and land loss. The berm was being constructed by the State of Louisiana in response to the Deepwater Horizon oil spill. The oceanographic measurements accompany USGS observations of geomorphic response to storms of the berm and Chandeleur Islands. For more information see https://cmgds.marine.usgs.gov/fan_info.php?fan=2010-055-FA, https://cmgds.marine.usgs.gov/fan_info.php?fan=2010-069-FA, https://cmgds.marine.usgs.gov/fan_info.php?fan=2010-092-FA.
  1. How might this data set be cited?
    Sherwood, Christopher R., 2011, Oceanographic Observations made adjacent to the Chandeleur Islands, Louisiana, July-November, 2010: U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    Other_Citation_Details: This applies to the data distribution site for an experiment.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -88.8609
    East_Bounding_Coordinate: -88.5146
    North_Bounding_Coordinate: +29.9698
    South_Bounding_Coordinate: +29.7391
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 08-Jul-2010
    Ending_Date: 08-Nov-2010
    Currentness_Reference:
    ground condition of data collection; data were not collected during the entire span of dates at each location and instrument. See the sampling interval link for specific start and end dates for each instrument.
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
  7. How does the data set describe geographic features?

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Christopher R. Sherwood
  2. Who also contributed to the data set?
    This research was funded by the USGS Coastal and Marine Geology Program. We thank the captains and crews of the R/V Acadiana and R/V Tommy Monroe for their outstanding logistical support for this field measurement program.
  3. To whom should users address questions about the data?
    Christopher R. Sherwood
    U.S. Geological Survey
    384 Woods Hole Road
    Woods Hole, MA
    United States

    (508) 457-8700 x2269 (voice)
    csherwood@usgs.gov

Why was the data set created?

This dataset provides oceanographic measurements for use in assessment how coastal erosion on barrier Islands and constructed berms may be effected by storms. Instrumented moorings were deployed at four sites on 10 July 2010, serviced 11-14 September 2010, and finally recovered on 7-8 November 2010. These data will be used to assess model calculations of waves, water levels, and currents near the Chandeleur Islands. The locations, deployment depths, sensor type and parameters measured during the deployment are presented in the table displayed by the Basic Sampling Interval link on the stellwagen server ( https://stellwagen.er.usgs.gov/GOMEX_CI.html ).

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 6)
    FIELD PROGRAM Four sites were occupied for two adjacent time periods from July 8 through November 7 or 8 2011. Each platform was out of the water for about a day in mid-September for battery replacement, data offload and other refurbishment. Separate platform IDs were assigned for each deployment at each site. Sites 1-3 were East of the Island at varying distances offshore in water depths of 13 to 30 meters. Site 6 was West of the Island, deployed at 4 meters depth. The platform IDs are as follows: Site 1- 889, 893; Site 2- 890, 895; Site 3- 891, 897; Site 6- 892, 899. An upward looking TRDI ADCP was deployed at each site to measure ocean current and wave conditions. All the data except for the waves parameters from both deployments at site 3 are usable. Person who carried out this activity:
    Ellyn Montgomery
    U.S. Geological Survey
    384 Woods Hole Road
    Woods Hole, MA
    United States

    508-457-8700 x2356 (voice)
    emontgomery@usgs.gov
    Date: 2011 (process 2 of 6)
    DATA PROCESSING Data processing was conducted using the proprietary software for each instrument, and (or) specialized software developed by the USGS. The proprietary software was often used to download data from the instruments and export the data to ASCII-files. Post-processing of the raw binary or ASCII files was accomplished using USGS software developed in the MATLAB (http://www.mathworks.com/) programming language. Data were first decoded and calibrated from instrument-specific formats and units to the EPIC-standard NetCDF format (http://www.pmel.noaa.gov/epic/) and scientific units. Data were carefully checked for instrument malfunctions and then edited. The beginning and end of each data series were truncated to remove data collected out of water. The data files include all variables recorded at the basic sampling interval. The processing steps on the ADCP at site 3 that produced 3 sections were the same as what would have been done if it had functioned properly and generated one file. These data have been edited to remove outlying points and data recorded when the instruments were out of the water before and after deployment. These data were released as provisional to enable their timely use in post-spill modeling efforts. They will be reviewed for Best basic Version (BBV) approval as time allows.
    Date: 12-Jul-2016 (process 3 of 6)
    Edits to the metadata were made to fix any errors that MP v 2.9.32 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.). Fixed online link to cross-reference. 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 Rd.
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 20-Jul-2018 (process 4 of 6)
    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: 31-Jan-2019 (process 5 of 6)
    Fixed broken links. 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 6 of 6)
    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?
    Montgomery, E.T., Martini, M.A., Lightsom, F.L., and Butman, Bradford, 2008, Documentation of the U.S. Geological Survey Oceanographic Time-Series Measurement Database: Open-File Report 2007-1194, 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?
  2. How accurate are the geographic locations?
    The mooring deployment locations (latitude and longitude) were recorded based on the vessel's onboard GPS navigation systems. The accuracy of each system is better than 15 meters.
  3. How accurate are the heights or depths?
    Bottom-mounted sensors have instrument_height attributes (meters above bottom) measured prior to deployment. The sensor height above bottom is accurate to within 1 cm, but the depth (representing the initial measurement depth) is only accurate to about 1 meter due to tidal fluctuations and use of nominal water depth. If the sensor acquires data in bins by depth (ADCP, PCADP), those depths are accurate to a few centimeters relative to each other. Sedimentation or scouring around the platform may change the vertical position over the course of a deployment by as much as 20 cm. The data is not adjusted to reflect any temporal changes in elevation of the sensor.
  4. Where are the gaps in the data? What is missing?
    The data have been edited to remove outlying points and data recorded when the instruments were out of the water before and after deployment. At site CI-3 about half of the current-meter data were missing from the first deployment period and because the instrument performance was intermittent, the data were recovered as three files instead of one continuous file. The pressure measurements from this instrument were incorrect for both deployments, so water level data are missing from the ADCP files and wave data are not available. All the other data are usable.
  5. How consistent are the relationships among the observations, including topology?
    Data are logically consistent

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:
Data presented within this publication are in the public domain. Please acknowledge the U.S. Geological Survey, Coastal Marine Geology Program as the source of this data.
  1. Who distributes the data set? (Distributor 1 of 1)
    Christopher R. Sherwood
    U.S. Geological Survey
    384 Woods Hole Road
    Woods Hole, MA
    USA

    (508) 457-8700 x2269 (voice)
    csherwood@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable Data available from https://stellwagen.er.usgs.gov/GOMEX_CI.html.
  3. What legal disclaimers am I supposed to read?
    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. 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. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    The user's computer must have software to read netCDF files or import OPeNDAP.

Who wrote the metadata?

Dates:
Last modified: 08-Sep-2020
Metadata author:
Ellyn T. Montgomery
U.S. Geological Survey
384 Woods Hole Road
Woods Hole, MA
United States

(508) 457-8700 x2356 (voice)
emontgomery@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/stellwagen/CI_meta2.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:20:42 2021