Location of sound velocity profiles collected by the U.S. Geological Survey off the southern shore of Martha's Vineyard, MA, 2007 (ESRI POINT SHAPEFILE, SVP)

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Frequently anticipated questions:

What does this data set describe?

Title:
Location of sound velocity profiles collected by the U.S. Geological Survey off the southern shore of Martha's Vineyard, MA, 2007 (ESRI POINT SHAPEFILE, SVP)
Abstract:
The USGS Woods Hole Science Center conducted a nearshore geophysical survey offshore of the southern coast of Martha's Vineyard, in the vicinity of the Martha's Vineyard Coastal Observatory (MVCO) in August 2007. This mapping program was part of a larger research effort supporting the Office of Naval Research (ONR) Ripples Directed-Research Initiative (DRI) studies at MVCO by providing data collection and modeling. The geophysical data will be used to provide initial conditions for wave and circulation models for the study area. Ultimately, geophysical mapping, oceanographic measurements and modeling will help to improve our understanding of coastal sediment-transport processes.
The geophysical mapping utilized a suite of high-resolution instrumentation to map the surficial sediment distribution, depth and sub-surface geology: dual-frequency 100/500 KHz sidescan-sonar system, 234-KHz interferometric sonar, and 500 Hz -12 KHz chirp sub-bottom profiler. The survey was conducted aboard the M/V Megan Miller August 9-13, 2007. The study area covers 35 square kilometers from about 0.2 km to 5-km offshore of the south shore of Martha's Vineyard, and ranges in depth from ~ 5 to 20 meters.
  1. How might this data set be cited?
    U.S. Geological Survey, 2009, Location of sound velocity profiles collected by the U.S. Geological Survey off the southern shore of Martha's Vineyard, MA, 2007 (ESRI POINT SHAPEFILE, SVP): Open-File Report 2008-1288, 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.

    Denny, J.F., Danforth, W.W., Foster, D.S., and Sherwood, C.R., 2009, Geophysical Data Collected off the South Shore of Martha's Vineyard, Massachusetts: Open-File Report 2008-1288, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -70.618758
    East_Bounding_Coordinate: -70.511816
    North_Bounding_Coordinate: 41.342546
    South_Bounding_Coordinate: 41.305003
  3. What does it look like?
    https://pubs.usgs.gov/of/2008/1288/GIS_catalog/Bathy/svp_650_sm.jpg (JPEG)
    Thumbnail image of the sound velocity profiles collected by the U.S. Geological Survey off the southern shore of Martha's Vineyard, 2007
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 09-Aug-2007
    Ending_Date: 13-Aug-2007
    Currentness_Reference:
    ground condition
  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 (14)
    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?
    svp
    ESRI Point Shapefile (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.
    Easting
    Easting coordinate of navigation fix (UTM Zone 19N meters) (Source: U.S. Geological Survey)
    Range of values
    Minimum:364504
    Maximum:373503
    Units:meters
    Northing
    Northing coordinate of navigation fix (UTM Zone 19N meters) (Source: U.S. Geological Survey)
    Range of values
    Minimum:4573848
    Maximum:4577889
    Units:meters
    Cast
    Station number of the sound velocity cast (Source: U.S. Geological Survey)
    Range of values
    Minimum:1
    Maximum:13
    Units:incremental svp station identification
    Depth
    Water depth at station location read off the SWATHplus acquisition system and recorded in the cruise log (Source: U.S. Geological Survey)
    Range of values
    Minimum:8.5
    Maximum:22
    Units:meters
    Hr
    Time of SVP cast (hours; 24-hr clock, UTC) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0
    Maximum:23
    Units:hour
    Min
    Time of SVP cast (minutes; 24-hr clock, UTC) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0
    Maximum:60
    Units:minute
    Sec
    Time of SVP cast (seconds; 24-hr clock, UTC) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0
    Maximum:60
    Units:second
    Jday
    Julian Day of data collection (UTC) (Source: U.S. Geological Survey)
    Range of values
    Minimum:221
    Maximum:225
    Units:Julian Day
    Hyperlink
    directory location of JPEG image depicting a graph of the SVP cast (Source: U.S. Geological Survey) JPG image file depicting SVP profile for given station
    Longitude
    Longitude of SVP cast location, WGS84 (Source: U.S. Geological Survey)
    Range of values
    Minimum:-70.618758
    Maximum:-70.511816
    Units:Decimal Degrees
    Latitude
    Latitude of SVP cast location, WGS84 (Source: U.S. Geological Survey)
    Range of values
    Minimum:41.305003
    Maximum:41.342546
    Units:Decimal Degrees

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?
    U.S. Geological Survey
  3. To whom should users address questions about the data?
    Jane Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2311 (voice)
    5084572310 (FAX)
    jdenny@usgs.gov

Why was the data set created?

This dataset is used to display the location of sound velocity profiles collected during USGS Cruise 07011 off the southern shore of Martha's Vineyard, 2007. 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 hyperlinks to graphs of the sound velocity profile within the water column at each station location, as well as location in easting and northing (UTM, Zone 19N, WGS84, meters), latitude, longitude, time of day and date.

How was the data set created?

  1. From what previous works were the data drawn?
    Information unavailable from original metadata (source 1 of 1)
    Information unavailable from original metadata - assumed USGS, unknown, Information unavailable from original metadata.

    Type_of_Source_Media: Information unavailable from original metadata
    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 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. As such, the swath bathymetric acquisition is described here, as well as acquisition procedures for the sound velocity profiles.
    Swath bathymetric data were collected using an SEA Ltd SWATHplus 234-kHz Interferometric Bathymetric Sonar (<http://www.sea.co.uk/swathplus.aspx?nav=products> ) during survey operations. The SWATHplus system was mounted as a sidemount and positioned on the starboard side of the R/V Megan Miller. Line spacing varied from 40 meter in ~ 5 to 15 meter water depth to 70 meters in ~15 - 25 meter water depth. Data files were recorded by SEA software SWATHplus 3.05.19 in the SWATHplus SXR format. Data collection parameters are saved into a SWATHplus session file in SEA's SXS format that can be later used for data replay.
    Pitch, roll, heading, and heave information were recorded using a Coda Octopus F180R motion reference unit (MRU) (see: <http://www.codaoctopus.com/motion/f180/index.asp>) and transmitted via network connection to the SWATHplus data collection software. The MRU sensor was mounted directly above the SWATHplus transducers, thereby minimizing "lever arm" offsets which can lead to positioning and depth errors in the bathymetric data. The F180R series MRU uses two L1 antennas for position and heading accuracy. These were mounted directly above the MRU with an offset of 6.76 meters. The antennas are mounted on a rigid horizontal pole with a separation of 1 meter and are offset from the MRU in a forward/aft configuration. The forward offset of the primary antenna from the MRU is 0.5 meters, with no port/starboard offset.
    Sound Velocity Profiles (SVP): Fourteen sound velocity casts were collected at various intervals during the USGS cruise 07011 using an Applied Microsystems SV Plus v2 instrument (see <http://www.appliedmicrosystems.com/products/productDetails.aspx?id=1> for details). Sound velocity profiles (SVP) were generally collected at the eastern and western ends of the survey area, corresponding to the start and/or end of geophysical line data collection. This procedure was primarily followed to coordinate collection of SVP casts with the beginning or end of trackline. This was acceptable because only small variations in the speed of sound were noted throughout the survey area and negligible refraction artifacts were visible within the swath bathymetric data.
  2. How were the data generated, processed, and modified?
    Date: 2007 (process 1 of 10)
    Fourteen sound velocity casts were collected at various intervals during the USGS cruise 07011 using an Applied Microsystems SV Plus v2 instrument (see http://www.appliedmicrosystems.com/products/productDetails.aspx?id=1 for details). Sound velocity profiles (SVP) were generally collected at the eastern and western ends of the survey area, corresponding to the start and/or end of geophysical line data collection. This procedure was primarily followed to coordinate collection of SVP casts with the beginning or end of trackline. This was acceptable because only small variations in the speed of sound were noted throughout the survey area and negligible refraction artifacts were visible within the swath bathymetric data.
    At each pre-defined station (i.e. location), the SV plus v2 was slowly lowered to the seafloor using a small shipboard winch. The SV plus v2 was monitored by a member of the science party and as the instrument made contact with the seafloor, the position (i.e. location) was recorded in the lab using HYPACK navigation software. The position was then manually recorded within the cruise log and SWATHplus acquisition software. Upon recovery, the SV plus was connected to an onboard computer via serial port in order to download data using the SV plus v2 communications software, SmartTalk.
    Software: SV plus v2 SmartTalk (no version) Person who carried out this activity:
    Jane Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2311 (voice)
    5084572310 (FAX)
    jdenny@usgs.gov
    Date: 2007 (process 2 of 10)
    The data were then exported in comma-delimited text format and opened within Microsoft Excel. The files were saved in Microsoft Excel format (*.xls). Graphs of the sound velocity profile (Depth vs. speed of sound) at each station were created within Microsoft Excel and saved within the spreadsheet and as PDF files. The files were then opened using Adobe Photoshop CS3 and exported as JPG images.
    Software: Microsoft Excel 2004; Adobe Photoshop CS3 (10.0.1) Person who carried out this activity:
    Jane Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2311 (voice)
    5084572310 (FAX)
    jdenny@usgs.gov
    Date: 2009 (process 3 of 10)
    The location of each of the fourteen sound velocity profiles was stored in eastings and northings (UTM, Zone 19N, meters, WGS84) in a comma-separated value file (*.csv). This file was reformatted using an UNIX awk script and station number, water depth at station taken from the SWATHplus acquisition system at the time of deployment, time and date were added.
    Software: AWK (no version) Person who carried out this activity:
    Jane Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2311 (voice)
    5084572310 (FAX)
    jdenny@usgs.gov
    Date: 2009 (process 4 of 10)
    The comma-delimited text file was then imported to ArcMap 9.2. An event theme was created using Tools - Add XY Data. The projection was defined as UTM, Zone 19N, meters, WGS84. The event theme was then converted to a point shapefile. A hyperlink field was then added to the attribute table of the shapefile in order to link to JPG images of graphs depicting the sound velocity profile at each station.
    Software: ArcGIS 9.2 Person who carried out this activity:
    Jane Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2311 (voice)
    5084572310 (FAX)
    jdenny@usgs.gov
    Date: 2009 (process 5 of 10)
    The point shapefile was reprojected from UTM, Zone 19N, WGS84 meters to a Geographic Coordinate System (WGS84) using Arc Toolbox Projections and Transformations, Feature, Project.
    Software: ArcGIS 9.2 Person who carried out this activity:
    Jane F. Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x 2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov
    Date: 2009 (process 6 of 10)
    Longitude and Latitude fields were added to the attribute table using XTools Pro 5.3 (Table Operations - Add X,Y,Z Coordinates).
    Software: ArcGIS 9.2 Person who carried out this activity:
    Jane F. Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-458-8700 x 2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov
    Date: 20-Oct-2017 (process 7 of 10)
    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. The source information was incomplete and had to be modified to meet the standard. The distribution format name was modified in an attempt to be more consistent with other metadata files of the same data format. 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 8 of 10)
    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 9 of 10)
    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 10 of 10)
    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?
    Real-Time Kinematic (RTK) navigation data were collected using an Ashtech Z-Extreme receiver, mounted on the SWATHplus sidemount and recorded using navigation software from HYPACK, Inc (http://www.hypack.com/new/). RTK provides accuracies on the order of 10s of centimeters (http://www.navcen.uscg.gov/). However, the horizontal and vertical offsets between the hand-winch used to deploy the SV plus v2 sound velocity profiler and the RTK antenna on the SWATHplus sidemount were not accounted for in determining the location of the sound velocity profiler. Thus, the horizontal accuracy of the sound velocity locations is considered to be +/- 10 meters.
  3. How accurate are the heights or depths?
    Water depth of the sound velocity profile locations were acquired by reading the depth from the SWATHplus acquisition system. Precise depths are recorded within the sound velocity profile as it is lowered and recovered through the water column.
    Vertical and horizontal position of the SWATHplus system were acquired with Differential Global Positioning System (DGPS) navigation. DGPS data were acquired with the forward, or primary, Coda Octopus F180R Motion Reference Unit (MRU) DGPS antenna and transmitted via a network connection to the SWATHplus data collection software. The F180R MRU is part of the rigid sidemount used to deploy the SWATHplus bathymetric system, and is mounted on the bracket holding the SWATHplus transducers. The F180R MRU consists of 2 L1 antennas used for position and heading. The antennas are mounted on a rigid horizontal pole, 6.76 meters above the F180R MRU, offset in a forward/aft configuration (see 'source contribution' for a full description of the F180R). DGPS accuracy is 1 to 3 meters, depending on the distance from a US Coast Guard coastal repeater station (<http://www.navcen.uscg.gov/>). However, offsets between the winch used to deploy the sound velocity profiler and the DGPS antenna were not recorded. Therefore, water depths provided are intended to give a general depth at the sound velocity profile location (within 1 meter).
  4. Where are the gaps in the data? What is missing?
    All sound velocity profiles collected during USGS Cruise 07011 are included in this ESRI shapefile.
  5. How consistent are the relationships among the observations, including topology?
    All sound velocity profiles were acquired with the same instrument during the course of USGS Cruise 07011; an Applied Microsystems SV plus v2.

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)
    Jane Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2311 (voice)
    5084572310 (FAX)
    jdenny@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?
    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?
    • Availability in digital form:
      Data format: WinZip (version 9.0) file containing ESRI point shapefile and associated metadata for sound velocity profiles collected during USGS Open-File Report 2008-1288 in format Shapefile (version ArcGIS 9.2) Size: 1
      Network links: https://pubs.usgs.gov/of/2008/1288/GIS_catalog/Bathy/svp.zip
    • Cost to order the data: none

  5. What hardware or software do I need in order to use the data set?
    This zip file contains data available in Environmental Systems Research Institute (ESRI) point 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:
Jane Denny
U.S. Geological Survey
Geologist
384 Woods Hole Rd.
Woods Hole, MA

(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@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/ofr2008-1288/07011svp.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:20:24 2021