Location of sound velocity profiles along with profile plots collected by the U.S. Geological Survey in 2014 along the Delmarva Peninsula, MD and VA (PNG images, CSV text, and Esri point shapefile, Geographic, WGS 84)

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Frequently anticipated questions:


What does this data set describe?

Title:
Location of sound velocity profiles along with profile plots collected by the U.S. Geological Survey in 2014 along the Delmarva Peninsula, MD and VA (PNG images, CSV text, and Esri point shapefile, Geographic, WGS 84)
Abstract:
The Delmarva Peninsula is a 220-kilometer-long headland, spit, and barrier island complex that was significantly affected by Hurricane Sandy. A U.S. Geological Survey cruise was conducted in the summer of 2014 to map the inner continental shelf of the Delmarva Peninsula using geophysical and sampling techniques to define the geologic framework that governs coastal system evolution at storm-event and longer timescales. Data collected during the 2014 cruise include swath bathymetry, sidescan sonar, chirp and boomer seismic-reflection profiles, acoustic Doppler current profiler, and sample and bottom photograph data. Processed data in raster and vector format are released here for the swath bathymetry, sidescan sonar, and seismic-reflection profiles. More information about the USGS survey conducted as part of the Hurricane Sandy Response-- Geologic Framework and Coastal Vulnerability Study can be found at the project website or on the WHCMSC Field Activity Web pages: https://woodshole.er.usgs.gov/project-pages/delmarva/ and https://cmgds.marine.usgs.gov/fan_info.php?fan=2014-002-FA
  1. How might this data set be cited?
    U.S. Geological Survey, 2015, Location of sound velocity profiles along with profile plots collected by the U.S. Geological Survey in 2014 along the Delmarva Peninsula, MD and VA (PNG images, CSV text, and Esri point shapefile, Geographic, WGS 84): data release DOI:10.5066/F7MW2F60, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts.

    Online Links:

    This is part of the following larger work.

    Pendleton, Elizabeth A., Ackerman, S.D., Baldwin, W.E., Danforth, W.W., Foster, D.S., Thieler, E.R., and Brothers, L.L., 2015, High-resolution geophysical data collected along the Delmarva Peninsula 2014, U.S. Geological Survey Field Activity 2014-002-FA: data release DOI:10.5066/F7MW2F60, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -75.567174
    East_Bounding_Coordinate: -74.687529
    North_Bounding_Coordinate: 38.423542
    South_Bounding_Coordinate: 37.538922
  3. What does it look like?
    https://cmgds.marine.usgs.gov/data/field-activity-data/2014-002-FA/data/bathymetry/mvp_data.png (PNG)
    Woods Hole Coastal and Marine Science Center sound velocity profile locations along the Delmarva Peninsula
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 18-Jun-2014
    Ending_Date: 22-Jul-2014
    Currentness_Reference:
    ground condition; data were not collected on 20140702-20140704; 20140709; and 20140714-20140715 due to weather.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector and 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 Vector data set. It contains the following vector data types (SDTS terminology):
      • Entity point (39)
    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 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?
    2014_002_FA_MVPdata
    Sound velocity profile locations (Source: U.S. Geological Survey)
    FID
    Internal feature number. (Source: Esri) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: Esri) Coordinates defining the features.
    castnum
    Name of velocity profile used to distinguish between casts. (Source: U.S. Geological Survey) Sequential numbers used to distinguish sound velocity casts.
    date
    year:month:day (Source: U.S. Geological Survey) year, month, and day of profile collection
    jd_time
    julian day:HH:MM:SS. Julian day is the integer number representing the interval of time in days since January 1 of the year. (Source: U.S. Geological Survey) julian day and UTC time of profile collection
    lat
    Latitude in Geographic Coordinates, WGS 84 (Source: U.S. Geological Survey)
    Range of values
    Minimum:37.538922
    Maximum:38.423542
    Units:decimal degrees
    Resolution:0.00001
    long
    Longitude in Geographic Coordinates, WGS 84 (Source: U.S. Geological Survey)
    Range of values
    Minimum:-75.567174
    Maximum:-74.687529
    Units:decimal degrees
    Resolution:0.00001
    Survey_ID
    WHCMSC field activity identifier (e.g. "2014-002-FA" where 2014 is the survey year, 002 is survey number of that year, and FA is Field Activity) (Source: U.S. Geological Survey) String up to 254 characters
    Vehicle_ID
    Survey vessel name (Source: U.S. Geological Survey) String up to 254 characters
    Device_ID
    Profiler device used to collect SVP (Source: U.S. Geological Survey) String up to 254 characters
    Entity_and_Attribute_Overview:
    The PNG images can be hyperlinked to their shapefile location in ArcGIS. The graphs show depth on the y-axis and speed of sound on the x-axis. The CSV file contains the following columns of data: castnum, date, jd_time, lat, long which correspond to the attributes of the same name in the shapefile.
    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?
    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2259 (voice)
    508-457-2310 (FAX)
    ependleton@usgs.gov

Why was the data set created?

This dataset is used to display the locations of sound velocity profiles (SVP) collected during a 2014 USGS cruise along the Delmarva Peninsula. The information contained within the sound velocity profiles is needed to adequately account for refraction artifacts that may be present within raw swath bathymetric data. This dataset contains graphs of the sound velocity profile at each station location, as well as location in easting and northing (UTM, Zone 18N, WGS84, meters), time of day and date of collection

How was the data set created?

  1. From what previous works were the data drawn?
    raw sound velocity data (source 1 of 1)
    U.S. Geological Survey, 2015, Sound Velocity Data.

    Type_of_Source_Media: disc
    Source_Contribution:
    Sound velocity profiles are acquired in order to measure the speed of sound in the water column during survey operations. This information is used to help correct any refraction artifacts that may be present within the swath bathymetric data due to unaccounted for changes in the speed of sound throughout the water column.
  2. How were the data generated, processed, and modified?
    Date: 2014 (process 1 of 6)
    Sound velocity profiles were collected every 1-2 hours and sometimes more frequently using a Brooks Ocean Moving Vessel Profiler (see <http://www.brooke-ocean.com/mvp_main.html> for details). A computer controlled smart winch and deployment system allows the free fall fish to be deployed while the vessel is underway at a user specified time interval. A Sitex DepthFinder informs the MVP of the approximate water depth at time of deployment to ensure that the fish does not make contact with the seafloor. The sound velocity data are written to a Kongsberg SIS format ASCII file (.asvp). Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2315 (voice)
    (508) 457-2310 (FAX)
    sackerman@usgs.gov
    Date: 2014 (process 2 of 6)
    The ASVP data are parsed to comma-delimited text format using an AWK script. This allows the profile locations to be turned into a shapefile. A python script is used to plot the SOS profile as speed of sound (m/s) versus Depth (meters). Position, Date, Time, and Profile ID are pulled from the ASVP header and written into the image (PNG) for reference. Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2315 (voice)
    (508) 457-2310 (FAX)
    sackerman@usgs.gov
    Date: 2015 (process 3 of 6)
    The location of each sound velocity profile in eastings and northings (UTM, Zone 18N, meters, WGS84) was saved to a comma-separated value file (*.csv) along with station number, julian day, date, and time. The comma-separated text file was then imported to ArcMap 10.2.2 using 'Add XY data' and saved as points (UTM WGS84 Zone 18N) in the Esri shapefile format. The shapefile was then projected from WGS84 UTM Zone 18N to Geographic WGS84. Additional fields for survey ID, vessel ID, and device ID were added in ArcMap version 10.2.2 Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2315 (voice)
    (508) 457-2310 (FAX)
    sackerman@usgs.gov
    Date: 18-Apr-2017 (process 4 of 6)
    The online links to the data were updated to reflect the new server hosting the data. Additionally, other small edits could be made to the metadata, such as modifying http to https where appropriate. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. 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 5 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: 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?

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?
    Differential Global Positioning System (DGPS) navigation data were acquired with a Hemisphere receiver and recorded with HYPACK (www.hypack.com). The DGPS antenna located on the port-side of the acquisition van. Ship location was used for the sound velocity deployments. The MVP30 sound velocity profiler is autonomously deployed while the vessel is underway and is computer controlled through a smart winch and deployment system. Deployment positions are recorded from the hemisphere DGPS. DGPS accuracy is 1 to 3 meters, depending on the distance from a US Coast Guard coastal repeater station. However, offsets from the location of deployment at the smart winch and the DGPS antenna were not measured. The horizontal accuracy of the sound velocity locations is considered to be +/- 25 meters.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    All sound velocity profiles not associated with the patch test (588 total) collected during cruise 2014-002-FA are included in the Esri shapefile.
  5. How consistent are the relationships among the observations, including topology?
    All sound velocity profiles were acquired with the same instrument; a MVP-30 profiler from Brooke Ocean using MVP30 software.

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 as the originator of the dataset.
  1. Who distributes the data set? (Distributor 1 of 1)
    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2259 (voice)
    (508) 457-2310 (FAX)
    ependleton@usgs.gov
  2. What's the catalog number I need to order this data set? USGS data release 2014-002-FA sound velocity locations and profiles from the Delmarva Peninsula area (2014-002-FA_mvpdata.zip). The zip file contains a folder with the following a shapefile with profile locations (2014_002_FA_MVPdata.shp), a CSV file that was used to create the shapefile (2014_002_FA_MVPdata.csv) and a folder (mvp_images)containing 588 PNG images that represent all sound velocity profiles graphically. A browse graphic (mvp_data.png) and FGDC CSDGM metadata files (2014_002_FA_MVPdata.xml) in four standard formats are also included in the zip file.
  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?
    This zip file contains data available point shapefile format. The user must have software capable of reading shapefile forrmat to use these data. A text viewer can be used to open the csv file and an image viewer can be used to see the PNG images.

Who wrote the metadata?

Dates:
Last modified: 08-Sep-2020
Metadata author:
Elizabeth Pendleton
U.S. Geological Survey
Geologist
384 Woods Hole Rd.
Woods Hole, MA

(508) 548-8700x2259 (voice)
(508) 457-2310 (FAX)
ependleton@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/field_activities/2014_002_fa/2014_002_FA_MVPdata.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:20:14 2021