2010-003-FA_SVPs - Location of sound velocity profiles collected by the U.S. Geological Survey in the nearshore surrounding the Elizabeth Islands, MA (ESRI point shapefile)

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Frequently-anticipated questions:

What does this data set describe?

Title:
2010-003-FA_SVPs - Location of sound velocity profiles collected by the U.S. Geological Survey in the nearshore surrounding the Elizabeth Islands, MA (ESRI point shapefile)
Abstract:
These data were collected under a cooperative agreement between the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey (USGS), Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center (WHCMSC). Initiated in 2003, the primary objective of this program is to develop regional geologic framework information for the management of coastal and marine resources. Accurate data and maps of seafloor geology are important first steps toward protecting fish habitat, delineating marine resources, and assessing environmental changes due to natural or human impacts. The project is focused on the inshore waters of coastal Massachusetts, primarily in water depths of 2-30 meters. Data collected for the mapping cooperative have been released in a series of USGS Open-File Reports (<http://woodshole.er.usgs.gov/project-pages/coastal_mass/html/current_map.html>). The data collected in this study area located around the western extent of the Elizabeth Islands includes high resolution bathymetry, acoustic-backscatter intensity, seismic-reflection, and navigation data. These data were collected during a nearshore cruise in September 2010 onboard the R/V Rafael using the following equipment: an SEA Ltd SwathPlus interferometric sonar (234 kHz), Klein 3000 dual frequency sidescan sonar, an Edgetech 424 chirp subbottom profiling system, and 4 GPS antennae. More information about the cruise conducted as part of the project: Geologic Mapping of the Seafloor Offshore of Massachusetts can be found on the Woods Hole Coastal and Marine Science Center Field Activity webpage: <http://quashnet.er.usgs.gov/data/2010/10003/>
  1. How should this data set be cited?

    U.S. Geological Survey, 2012, 2010-003-FA_SVPs - Location of sound velocity profiles collected by the U.S. Geological Survey in the nearshore surrounding the Elizabeth Islands, MA (ESRI point shapefile): Open-File Report 2011-1184, 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.

    Pendleton, Elizabeth A. , Twichell, David C. , Foster, David S. , Worley, Charles R. , Irwin, Barry J. , and Danforth, William W. , 2012, High-Resolution Geophysical Data From the Sea Floor Surrounding the Western Elizabeth Islands, Massachusetts: Open-File Report 2011-1184, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -70.978214
    East_Bounding_Coordinate: -70.850051
    North_Bounding_Coordinate: 41.459365
    South_Bounding_Coordinate: 41.395991

  3. What does it look like?

    <https://pubs.usgs.gov/of/2011/1184/GIS_catalog/svps/svps.png> (PNG)
    Woods Hole Coastal and Marine Science Center sound velocity profile locations offshore of the Elizabeth Islands, MA

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 10-Sep-2010
    Ending_Date: 16-Sep-2010
    Currentness_Reference: Data were not collected on 20100915 due to weather conditions.

  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.

      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 0.5
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values

  7. How does the data set describe geographic features?

    2010-003-FA_SVPs_dd
    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.

    x
    Easting coordinate in UTM Zone 19 meters, WGS84 (Source: U.S. Geological Survey)

    Range of values
    Minimum:334624.7
    Maximum:345404.8
    Units:meters
    Resolution:0.1

    y
    Northing coordinate in UTM Zone 19 meters, WGS84 (Source: U.S. Geological Survey)

    Range of values
    Minimum:4584605.6
    Maximum:4591449.1
    Units:meters
    Resolution:0.1

    z
    depth of water at profile location based on HYPACK (Source: U.S. Geological Survey)

    Range of values
    Minimum:7
    Maximum:25
    Units:meters
    Resolution:1

    time
    Universal Coordinated Time of sound velocity cast (hh:mm:ss) (Source: U.S. Geological Survey)

    time

    cast
    Name of velocity profile used to distinguish between casts. (Source: U.S. Geological Survey)

    Sequential numbers used to distinguish sound velocity casts

    jd
    Julian day data were collected (Julian day is the integer number representing the interval of time in days since January 1 of the year) (Source: U.S. Geological Survey)

    Range of values
    Minimum:253
    Maximum:259
    Units:day
    Resolution:1

    image
    Name of velocity profile PNG image used as hyperlink (Source: U.S. Geological Survey)

    Sequential numbers used to distinguish sound velocity casts.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    David C. Twichell
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2266 (voice)
    508-457-2310 (FAX)
    dtwichell@usgs.gov

Why was the data set created?

This dataset is used to display the locations of sound velocity profiles collected during USGS Cruise 2010-003-FA within the nearshore surrounding the Elizabeth Islands, MA. 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 at each station location, as well as location in easting and northing (UTM, Zone 19N, WGS84, meters), time of day and date.

How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    U.S. Geological Survey.

    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. For information on collection of swath bathymetric data see the swath trackline file metadata (2010-003-FA_Swath_tracklines.shp) or a bathymetric grid metafile (ei_2hm_nofill) report.

  2. How were the data generated, processed, and modified?

    Date: Sep-2010 (process 1 of 3)
    Profiles were collected at least once during each survey day, and multiple times per day when the data suggested significant stratification within the water column. Fourteen sound velocity casts were collected in total during USGS Cruise 2010-003-FA using an Applied Microsystems SV Plus v2 instrument (see <http://www.appliedmicrosystems.com/products/productDetails.aspx?id=1> for details).

    At each station, the SV plus 2 was hand deployed and slowly lowered to the seafloor. 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.

    Person who carried out this activity:

    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

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

    Date: Sep-2010 (process 2 of 3)
    The data were then exported in comma-delimited text format and imported to MATLAB (version R2011a). Graphs of the sound velocity profile (Pressure vs. speed of sound) at each station were created within MATLAB and exported as *.png files

    Person who carried out this activity:

    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

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

    Date: Feb-2011 (process 3 of 3)
    The location of each of the fourteen sound velocity profiles in eastings and northings (UTM, Zone 19N, meters, WGS84) was saved to a comma-separated value file (*.csv) along with station number, water depth at station, and day and time. The comma-separated text file was then imported to ArcMap 9.3 using 'Add XY data' and saved as points (UTM WGS84 Zone 19N) in the ESRI shapefile format. The shapefile was then projected from WGS84 UTM Zone 19N to Geographic WGS84.

    Person who carried out this activity:

    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 x2259 (voice)
    (508) 457-2310 (FAX)
    ependleton@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 Communications Systems International (CSI), Inc. LGBX Pro receiver and recorded with HYPACK (www.hypack.com). The CSI received positions from a DGPS antenna located on the port, aft roof of the R/V Rafael cabin. Ship location was used for the sound velocity deployments. The SV plus v2 sound velocity profiler was hand deployed. Once the system reached bottom, positions were read from HYPACK and stored. 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 hand-deployment and the DGPS antenna were not measured, and the ship is allowed to drift during deployment which can last several minutes depending on water depth. The horizontal accuracy of the sound velocity locations is considered to be +/- 50 meters.

  3. How accurate are the heights or depths?

    Water depth of the sound velocity profiles was extracted from the recorded sound velocity profile after recovery. Depth (as pressure in dbars) is recorded as the sound velocity profiler is lowered through the water column and downloaded after the instrument is recovered. Data are stored in ASCII text files.

  4. Where are the gaps in the data? What is missing?

    All sound velocity profiles not associated with the patch test collected during cruise 2010-003-FA 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 cruise 2010-003-FA; 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)

    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700x2259 (voice)
    (508) 457-2310 (FAX)
    ependleton@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?

  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: 18-Nov-2011
Metadata author:
Elizabeth Pendleton
U.S. Geological Survey
Geologist
384 Woods Hole Rd.
Woods Hole, MA 02543-1598

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

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.8.25 on Fri Nov 18 14:47:26 2011