RAW sound velocity profile data from a Minos X collected from outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA (PNG images, SVP text, and point shapefile, GCS WGS 84)

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Frequently anticipated questions:

What does this data set describe?

Title:
RAW sound velocity profile data from a Minos X collected from outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA (PNG images, SVP text, and point shapefile, GCS WGS 84)
Abstract:
The U.S. Geological Survey (USGS) Woods Hole Coastal and Marine Science Center (WHCMSC) completed a bathymetric and shallow seismic-reflection survey during the period of June 9, 2021 to June 24, 2021 in water depths from 2 m to 30 m for a portion of the outer Cape Cod nearshore environment between Marconi and Nauset Beaches. The products from this survey will help to support white shark research on their shallow-water behavior in the dynamic nearshore environment at Cape Cod National Seashore (CACO). CACO visitors’ safety is threatened by interactions between the public and white sharks. This project provides CACO with baseline data and information on nearshore white shark habitat, specifically in the nearshore shoreface, bathymetric trough, and longshore bar. This data release provides the geophysical data collected from outer Cape Cod during USGS Field Activities 2021-002-FA in 2021.
Supplemental_Information:
Support for 2021-004-FA was provided to the USGS from the National Park Service, Cape Cod National Seashore. Additional information on the field activities associated with this project are available at https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-004-FA
  1. How might this data set be cited?
    Ackerman, Seth D., 20231114, RAW sound velocity profile data from a Minos X collected from outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA (PNG images, SVP text, and point shapefile, GCS WGS 84): data release DOI:10.5066/P9GO90TI, U.S. Geological Survey, Coastal and Marine Hazards and Resources Program, Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts.

    Online Links:

    This is part of the following larger work.

    Ackerman, Seth D., Foster, David S., Worley, Charles R., and Nichols, Alexander R., 2023, High-resolution geophysical and geological data collected from outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA: data release DOI:10.5066/P9GO90TI, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    Suggested citation: Ackerman, S.D., Foster, D.S., Worley, C.R., and Nichols, A.R., 2023, High-resolution geophysical and geological data collected from outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9GO90TI.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -69.97640
    East_Bounding_Coordinate: -69.91500
    North_Bounding_Coordinate: 41.94240
    South_Bounding_Coordinate: 41.78320
  3. What does it look like?
    https://cmgds.marine.usgs.gov/data-releases/media/2022/10.5066-P9GO90TI/d3f2a087b27d4d02a49448a329dd8afa/2021-004-FA_SVP_data_browse.jpg (JPEG)
    Thumbnail image of sound speed profile locations collected from outer Cape Cod, Massachusetts.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 09-Jun-2021
    Ending_Date: 24-Jun-2021
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: PNG images, ASCII text, and Shapefile
  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 (45)
    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 0.0000054863. Longitudes are given to the nearest 0.000007073695. 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?
    2021-004-FA_SVP_data.shp
    Sound velocity locations collected from outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA. (Source: U.S. Geological Survey)
    Lon
    Decimal degree longitude value in GCS WGS 84. (Source: U.S. Geological Survey)
    Range of values
    Minimum:-69.976369
    Maximum:-69.915031
    Units:degrees
    Resolution:.000001
    Lat
    Decimal degree latitude value in GCS WGS 84. (Source: U.S. Geological Survey)
    Range of values
    Minimum:41.783164
    Maximum:41.942357
    Units:degrees
    Resolution:.000001
    SVP
    Name of sound velocity profile used to distinguish between casts. Profile names are in the format: Cast_0001, where 'Cast' indicates a sound velocity cast, '0001' indicates the incremental cast number (see note in the completeness report about missing/corrupt casts). (Source: U.S. Geological Survey) Character set
    Date
    Month/Day/Year when the sound velocity cast was collected. (Source: U.S. Geological Survey) Character set
    JD_UTC
    Julian day and UTC time when the sound velocity cast was collected in the format: JD:HH:MM; Julian day is the integer number (although recorded here in text string format) representing the interval of time in days since January 1 of the year of collection. (Source: U.S. Geological Survey) Character set
    SurveyID
    WHCMSC field activity identifier (e.g. "2021-004-FA" where 2021 is the survey year, 004 is survey number of that year, and FA is Field Activity). (Source: U.S. Geological Survey) Character set
    VehicleID
    Survey vessel name. (Source: U.S. Geological Survey) Character set
    DeviceID
    Device used to collect sound speed profile data. (Source: U.S. Geological Survey) Character set
    Entity_and_Attribute_Overview:
    The PNG images can be hyperlinked to their shapefile location in ArcGIS using the field called SVP. The graphs show depth on the y-axis and speed of sound on the x-axis. The format of the CARIS SVP files is as follows: Header line 1:[SVP_VERSION_2] - the standard CARIS SVP header line; Header line 2:filename; Header line 3:Section YYYY-JJJ HH:MM:SS DD:MM:SS -DD:MM:SS where YYYY is the year, JJJ is the Julian day, HH:MM:SS is the UTC time, DD:MM:SS is the latitude (in degrees, minutes, seconds) and -DD:MM:SS is the longitude (in degrees, minutes, seconds). The header is followed by column data of depth (meters) and speed of sound (meters per second).
    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)
    • Seth D. Ackerman
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov

Why was the data set created?

This dataset is used to display the locations of sound velocity profiles collected with AML Minos X SVP (sound velocity profiler) during survey 2021-004-FA from outer Cape Cod, Massachusetts. The information contained within the sound velocity profiles is needed to account for refraction artifacts that may be present within raw swath bathymetric data. This dataset contains graphs of the raw sound velocity profile at each station location, as well as location in Geographic Coordinate System (GCS) WGS 84 latitude and longitude, 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, Unpublished Material, Sound Velocity Data in ASVP format.

    Type_of_Source_Media: disc
    Source_Contribution:
    Sound speed profiles were collected to correct refraction artifacts in the multibeam bathymetric data that can occur due to changes in the speed of sound throughout the water column.
  2. How were the data generated, processed, and modified?
    Date: 24-Jun-2021 (process 1 of 3)
    The Minos X hand-deployed sound velocity profiler was deployed approximately 1-2 hours to collect sound velocity, pressure, and temperature profiles in the water column. AML SeaCast software (v. 4.4) was used to read the profile data from the Minos X, export all raw cast data to an AML SeaCast (.csv) formatted file, then edit the sound velocity profile to preserve only the downcast portion of the deployment and export it to a Kongsberg SIS ASCII (.asvp) formatted file. Person who carried out this activity:
    Charles R Worley
    U.S. Geological Survey
    Physical Scientist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700 x2250 (voice)
    (508) 457-2310 (FAX)
    cworley@usgs.gov
    Date: 01-Jul-2021 (process 2 of 3)
    A Python script (plotMVPsql_2021_004_py3) was used to read the ASVP data and plot the sound speed profile as speed of sound (meter/second) versus depth (meters). Position, Date, Time, and Profile ID were pulled from the ASVP header and written into the image (PNG) for reference. Within the same script, the Position, Julian day, Time, and Profile ID were also imported to a geospatial SQLite (version 3.26.0) database using the pyspatialite interface. The geographic positions were used to create point geometries for the station locations, and additional fields indicating survey ID, vessel ID, and device ID were added within the Python script. Lastly, the Python script also reformats the parsed ASVP data into sound velocity files that are ready for import into CARIS HIPS to be used for correcting refraction artifacts typically found in swath bathymetry data. The contact person for this and all subsequent processing steps below is Seth Ackerman. Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov
    Date: 06-Dec-2022 (process 3 of 3)
    The sound velocity cast locations were brought into QGIS (version 3.28) and then exported in Esri Shapefile format using the CRS WGS 84 (EPSG:4326).
  3. What similar or related data should the user be aware of?
    Fofonoff, N., and Millard, R., 1983, Algorithms for Computation of Fundamental Properties of Seawater: UNESCO Tech. Pap. Mar. Sci. 44.

    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?
    Navigation data were acquired using the WGS 84 coordinate system with an Applanix POS MV Wavemaster (model 220, V5), which blends Global Navigation Satellite Systems (GNSS) with acceleration data from a Motion Reference Unit (MRU) and GPS azimuthal heading. The POS MV was configured with two AeroAntenna Technologies GPS antennas located at either end of a 2-m baseline, which was oriented athwartship and mounted atop the aft end of cabin. Positioning data from these GPS receivers were recorded using HYPACK software version 19.0.6.0 during the entire geophysical survey and positions were used for SVP deployment locations. DGPS positions are horizontally accurate to 0.5 - 2 meters. However, offsets from the location of the SVP deployment point and the GPS antenna were not measured, and therefore the horizontal accuracy of the sound velocity profile locations is considered to be within 2 m.
  3. How accurate are the heights or depths?
    Minos X depths are calculated by the AML SeaCast software (version 4.4); the software converts pressure sensor readings to depth using the standard formulas described in Fofonoff, N.P. and Millard, R.C., Jr., 1988, Algorithms for computation of fundamental properties of seawater, UNESCO Technical Papers in Marine Science, No. 44. The depths are estimated to be accurate to within 1 meter.
  4. Where are the gaps in the data? What is missing?
    A total of 45 sound velocity profiles were collected during survey 2021-004-FA and are included in this dataset. Profiles are named sequentially beginning with the casts collected on the first day of surveying. Any gap in sequential numbering indicates invalid or unusable profile data (there is no data for casts 3, 9-11, 14, 19, and 25).
  5. How consistent are the relationships among the observations, including topology?
    Sound velocity profiles were acquired with an AML Minos X Sound Velocity Profiler (SVP).

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)
    U.S. Geological Survey
    Attn: Coastal and Marine Hazards and Resources Program
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    whsc_data_contact@usgs.gov
  2. What's the catalog number I need to order this data set? Sound velocity profile data collected from outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA, using an AML Oceanographic Moving Vessel Profiler and an AML Minos X sound velocity profiler: includes the shapefile 2021-004-FA_SVP_data.shp, 45 PNG images representing all sound speed profiles graphically (2021-004-FA_SVP_Images.zip), 45 .svp ASCII files that represent all sound speed profile data (2021-004-FA_SVP_SVP.zip), a browse graphic (2021-004-FA_SVP_data_browse.jpg) and a Federal Geographic Data Committee (FGDC) Content Standards for Digital Geospatial Metadata (CSDGM) metadata file (2021-004-FA_SVP_data_meta.xml).
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.
  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 shapefile, SVP and PNG formats. The user must have software capable of reading shapefile format to use these data. The SVP files can be read with a text editor. PNG files can be viewed with any PNG image viewing software. The zip files must be uncompressed in order to view the images.

Who wrote the metadata?

Dates:
Last modified: 14-Nov-2023
Metadata author:
Seth Ackerman
U.S. Geological Survey
Geologist
384 Woods Hole Rd.
Woods Hole, MA
USA

508-548-8700 x2315 (voice)
508-457-2310 (FAX)
whsc_data_contact@usgs.gov
Metadata standard:
Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/DRB_data_release/DRB_P9GO90TI/2021-004-FA_SVP_data_meta.faq.html>
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