Sound velocity profiles - locations, images, and text files for sound velocity profiles calculated from XBT and CTD casts conducted during USGS field activities 2017-001-FA and 2017-002 FA.

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2020
Title:
Sound velocity profiles - locations, images, and text files for sound velocity profiles calculated from XBT and CTD casts conducted during USGS field activities 2017-001-FA and 2017-002 FA.
Edition: 1.0
Geospatial_Data_Presentation_Form: digital data
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9Y1MSTN
Publication_Information:
Publication_Place:
Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: https://doi.org/10.5066/P9Y1MSTN
Online_Linkage: Larger_Work_Citation:
Citation_Information:
Originator: Wayne E. Baldwin
Originator: Eric M. Moore
Originator: Charles R. Worley
Originator: Alex R. Nichols
Originator: Carolyn D. Ruppel
Publication_Date: 2020
Title:
Marine Geophysical Data Collected to Support Methane Seep Research Along the U.S. Atlantic Continental Shelf Break and Upper Continental Slope Between the Baltimore and Keller Canyons During U.S. Geological Survey Field Activities 2017-001-FA and 2017-002-FA.
Edition: 1.0
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9Y1MSTN
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details:
Suggested citation: Baldwin, W.E., Moore, E.M., Worley, C.R., Nichols, A.R., and Ruppel, C.D., 2020, Marine Geophysical Data Collected to Support Methane Seep Research Along the U.S. Atlantic Continental Shelf Break and Upper Continental Slope Between the Baltimore and Keller Canyons During U.S. Geological Survey Field Activities 2017-001-FA and 2017-002-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9Y1MSTN.
Online_Linkage: https://doi.org/10.5066/P9Y1MSTN
Online_Linkage:
Description:
Abstract:
In spring and summer 2017, the U.S. Geological Survey’s Gas Hydrates Project conducted two cruises aboard the research vessel Hugh R. Sharp to explore the geology, chemistry, ecology, physics, and oceanography of sea-floor methane seeps and water column gas plumes on the northern U.S. Atlantic margin between the Baltimore and Keller Canyons. Split-beam and multibeam echo sounders and a chirp subbottom profiler were deployed during the cruises to map water column backscatter, sea-floor bathymetry and backscatter, and subsurface stratigraphy associated with known and undiscovered sea-floor methane seeps. The first cruise, known as the Interagency Mission for Methane Research on Seafloor Seeps and designated as field activity 2017-001-FA, was conducted from May 4 to May 11, 2017, and acquired geophysical data to support remotely operated vehicle exploration of seep sites using the Global Explorer, which is operated by Oceaneering International, Inc. Geophysical operations during cruise 2017-002-FA from August 25 to September 6, 2017, were also focused on mapping water column methane plumes, sea-floor seep sites, and subseafloor strata, but primarily supported conductivity, temperature, and depth instrument deployment, surface-water methane-concentration mapping, and water-sampling operations as part of a collaborative study with the University of Rochester of the effect of methane seepage on ocean water biogeochemistry. The National Oceanic and Atmospheric Administration’s Office of Ocean Exploration and Research partially sponsored cruise 2017-001-FA, and the U.S. Department of Energy partially sponsored both cruises.
Purpose:
This dataset is used to display the locations of sound velocity profiles (SVP, also referred to as sound speed profiles), as well as the SVP data, collected using Sippican XBT probes and a Seabird Electronics 911plus CTD during two 2017 USGS cruises along the U.S. Atlantic continental shelf break and upper continental slope between Accomac and Keller Canyons. The sound velocity profiles document water column sound speed variability during the cruises, and were used during processing to account for refraction artifacts present within the multibeam bathymetric data. The dataset contains graphs of the sound velocity profile at each station, as well as the date of collection, time of day, and station location coordinates in Geographic Coordinate System (GCS) WGS 84 latitude and longitude.
Supplemental_Information:
Support for 2017-001-FA was provided to the USGS by NOAA and DOE through interagency agreements 16-01118 and DE-FE0023495, respectively. Support for 2017-002-FA was provided to the USGS and the University of Rochester by DOE through interagency agreement DE-FE0026195 and grant DE-FE0028980, respectively. Additional information on the field activities are available from https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-001-FA and https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-002-FA. Additional information specific to the Interagency Mission for Methane Research on Seafloor Seeps is available at https://www.usgs.gov/centers/whcmsc/science/immerss-interagency-mission-methane-research-seafloor-seeps?qt-science_center_objects=0#qt-science_center_objects and https://archive.usgs.gov/archive/sites/soundwaves.usgs.gov/2017/05/outreach.html.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20170504
Ending_Date: 20170905
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned.
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -75.777222
East_Bounding_Coordinate: -74.070000
North_Bounding_Coordinate: 37.813333
South_Bounding_Coordinate: 35.296667
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:5e1e05d7e4b0ecf25c610cc2
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Woods Hole Coastal and Marine Science Center
Theme_Keyword: WHCMSC
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Theme_Keyword: CMHRP
Theme_Keyword: Department of the Interior
Theme_Keyword: DOI
Theme_Keyword:
National Oceanic and Atmospheric Administration - Office of Ocean Exploration and Research
Theme_Keyword: NOAA-OER
Theme_Keyword: Department of Energy
Theme_Keyword: DOE
Theme_Keyword: University of Rochester
Theme_Keyword: field activity number 2017-001-FA
Theme_Keyword: HRS1704
Theme_Keyword: Interagency Mission for Methane Research on Seafloor Seeps
Theme_Keyword: IMMeRSS
Theme_Keyword: field activity number 2017-002-FA
Theme_Keyword: HRS1713
Theme_Keyword: R/V Hugh R. Sharp
Theme_Keyword: shapefile
Theme_Keyword: Sippican XBT
Theme_Keyword: Seabird Electronics 911plus CTD
Theme_Keyword: SVP
Theme_Keyword: SSP
Theme_Keyword: PNG
Theme_Keyword: sound velocity profile
Theme_Keyword: sound speed profile
Theme_Keyword: marine geophysics
Theme_Keyword: oceanography
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: geoscientificInformation
Theme_Keyword: location
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: profiles
Theme_Keyword: sound velocity
Theme_Keyword: ocean sciences
Theme_Keyword: navigational data
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: United States of America
Place_Keyword: Atlantic Ocean
Place_Keyword: Atlantic Margin
Place_Keyword: Accomac Canyon
Place_Keyword: Washington Canyon
Place_Keyword: Norfolk Canyon
Place_Keyword: Keller Canyon
Place_Keyword: Chincoteague Ridge
Temporal:
Temporal_Keyword_Thesaurus: none
Temporal_Keyword: 2017
Access_Constraints: none
Use_Constraints:
Public domain data from the U.S. Government are freely distributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne E. Baldwin
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: Massachusetts
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2226
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: Browse_Graphic_File_Description: Example SVP profile image.
Browse_Graphic_File_Type: JPG
Cross_Reference:
Citation_Information:
Originator: Demopoulos, A.
Originator: McClain-Counts, J.
Originator: Bourque, J.
Originator: Prouty, N.
Originator: Smith, B.
Originator: Brooke, S.
Originator: Ross, S.
Originator: Ruppel, C.
Publication_Date: 2019
Title:
Examination of Bathymodiolus childressi nutritional sources, isotopic niches, and food-web linkages at two seeps in the US Atlantic margin using stable isotope analysis and mixing models.
Edition: 1.0
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Deep Sea Research Part I
Issue_Identification: 148, pp.53-66
Publication_Information:
Publication_Place: Amsterdam, Netherlands
Publisher: Elsevier
Online_Linkage: https://doi.org/10.1016/j.dsr.2019.04.002
Cross_Reference:
Citation_Information:
Originator: Leonte, M.
Originator: Ruppel, C. D.
Originator: Ruiz‐Angulo, A.
Originator: Kessler, J. D.
Publication_Date: 2020
Title:
Surface methane concentrations along the Mid‐Atlantic Bight driven by aerobic subsurface production rather than seafloor gas seeps.
Edition: 1.0
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Journal of Geophysical Research: Oceans
Issue_Identification: vol. 125
Publication_Information:
Publication_Place: Washington, DC
Publisher: American Geophysical Union Publications
Online_Linkage: https://doi.org/10.1029/2019JC015989
Cross_Reference:
Citation_Information:
Originator: Leonte, M.
Originator: Ruppel, C. D.
Originator: Ruiz‐Angulo, A.
Originator: Kessler, J. D.
Publication_Date: 2020
Title:
Water temperature, salinity, methane, methane stable isotopes, and others chemical parameters collected by CTD and Niskin bottles from research vessel Hugh R. Sharp in Mid-Atlantic Bight from 2017-08-25 to 2017-09-05.
Edition: 1.0
Geospatial_Data_Presentation_Form: dataset
Series_Information:
Series_Name: NOAA National Centers for Environmental Information Dataset
Issue_Identification: NCEI Accession 0209090
Publication_Information:
Publication_Place: Boulder, CO
Publisher: NOAA National Centers for Environmental Information
Online_Linkage: https://doi.org/10.25921/pr39-4f13
Cross_Reference:
Citation_Information:
Originator: Ruppel, C.
Originator: Demopoulos, A.
Originator: Prouty, N.
Publication_Date: 2018
Title:
Exploring US Mid-Atlantic Margin Methane Seeps: IMMeRSS, May 2017.
Edition: 1.0
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Supplement to Oceanography
Issue_Identification: 31(1), p.93
Publication_Information:
Publication_Place: Rockville, MD
Publisher: The Oceanography Society
Online_Linkage: https://doi.org/10.5670/oceanog.2018.supplement.01
Data_Quality_Information:
Logical_Consistency_Report:
Sound velocity profiles were calculated from either Sippican Expendable Bathythermograph (XBT, T4 or T5 types) probe temperature and depth data or Seabird Electronics (SBE) 911plus conductivity, temperature, and depth (CTD) cast data. XBT probes were primarily launched during overnight geophysical mapping operations on both cruises, while CTD casts were conducted during daytime operations on 2017-002-FA only. 2017-001-FA_T4XBT01, 2017-001-FA_T4XBT05, 2017-001-FA_T4XBT07, and 2017-002-FA_T4XBT01 do not coincide with a trackline in '2017-001-FA_2017-002-FA_7160Tracklines.shp' or '2017-001-FA_2017-002-FA_EK60Tracklines' because the casts were conducted either prior to the start of geophysical survey operations or after they were completed. The approximately 11 meter profile for cast 2017-002-FA_CTD08 represents a test deployment of the CTD system in the Delaware River estuary.
Completeness_Report:
Each sound velocity profile (51 total) collected during cruises 2017-001-FA and 2017-002-FA is represented by a Caris .svp formatted ASCII text file (see description below in the entity and attribute overview section), a PNG image file, and a feature point location in '2017-001-FA_2017-002-FA_SVPdata.shp'.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Navigation for the XBT casts was provided using a Hemisphere GPS receiver. XBTs were launched from the center of the stern, ~ 16 m aft of the GPS antenna mounted on the aft 01 deck handrail and the positional offset was not accounted for. A HYPACK (v. 17.0.26.0) target was created to record the position of each SVP station, and the geographic coordinates were manually entered into the WinMK21 (version 7.1) acquisition software as casts were conducted. Navigation for the CTD casts was provided by the vessel's Furuno GP-37 GPS and logged to the raw data header. CTD operations were conducted from the CTD winch station located on the starboard side approximately amidships. While the horizontal position accuracy is thought to be within 3 meters for the GPS position solutions, we consider the positions for the XBT casts to be within approximately 20 m, since the offset to the stern launch position was not accounted for. Reported positions represent locations at the start of each cast.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
XBTs depths are estimated as a function of time after deployment via fall-rate equations by the WinMK21 (version 7.1) acquisition software and derived depths are accurate to within 2 percent of the water depth. SBE 911plus CTD depths are estimated by the Seabird Seasave (version 7.26.7) acquisition software via a calculation converting pressure sensor readings to depths while taking into account sea water density and gravity as a function of latitude, and the depths are thought to be accurate to within 1 meter.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: unpublished material
Title: XBT and CTD profile data
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20170504
Ending_Date: 20170905
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: XBT and CTD profile data
Source_Contribution:
A Sippican XBT system consisting of a hand launcher connected via cable to an MK21 processing unit was used to launch Sippican T4 and T5 XBT probes (maximum depths of 460 and 1830 m, respectively) from the center stern of the vessel, and WinMK21 (version 7.1) acquisition software logged the temperature and depth data during each deployment. GPS navigation data for the sound velocity profiles were acquired using the WGS 84 coordinate system with a Hemisphere GPS receiver. XBTs were launched from the center of the stern, ~ 16 m aft of the GPS antenna mounted on the aft 01 deck handrail and the positional offset was not accounted for. A HYPACK (v. 17.0.26.0) target was created to record the position of each SVP station, and the geographic coordinates were manually entered into the WinMK21 (version 7.1) acquisition software as casts were conducted. CTD data were collected using an SBE 911plus CTD system, consisting of a 9plus CTD unit deployed from the CTD winch station located on the starboard side approximately amidships, with data transferred via the winch wire through a slip ring, and logged by an 11plus deck unit and Seabird Seasave (version 7.26.7) acquisition software in real time. Navigation for the CTD casts was provided by the vessel's Furuno GP-37 DGPS and logged to the raw data header.
Process_Step:
Process_Description:
XBT and CTD deployment and data and processing at sea:
During 2017-001-FA and 2017-002-FA XBT probes were generally deployed at the start and end of each overnight geophysical watch and intermittently when the multibeam bathymetric data were substantially impacted by sound speed related refraction artifacts. The Raw XBT EDF files recorded by the WinMK21 (version 7.1) acquisition software were imported into SVPEditor (version 1.0.5), which calculated a sound velocity profile via the UNESCO equation (Fofonoff and Millard, 1983) using the temperature profile data and a synthetic salinity profile estimated from World Ocean Atlas (2009) data at the location of the cast. The resulting sound velocity profiles were exported in Caris .svp and HYPACK .vel formatted ASCII files. CTD casts were primarily performed during daytime operations of 2017-002-FA only. R/V Sharp technicians used Seabird Seasave (version 7.26.7) to acquire and process the raw CTD HEX data, with one of the resulting outputs being a .sv_csv sound velocity profile for the downward portion of the cast, also calculated using the UNESCO equation. A python script was used to extract the time and position for the start of the cast from the processed .csv file, and the processed depth and sound velocity columns from the .sv_csv file and save them to a Caris .svp formatted ASCII file. (Fofonoff, N.P. and Millard Jr, R.C. (1983) Algorithms for the computation of fundamental properties of seawater. Paris, France, UNESCO, 53pp. (UNESCO Technical Papers in Marine Sciences; 44), http://hdl.handle.net/11329/109)
This process step and all subsequent process steps were conducted by the same person - Wayne Baldwin.
Process_Date: 201709
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne E. Baldwin
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2226
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov
Process_Step:
Process_Description:
Plot the SVP data and import into SpatiaLite database:
A python script was used to read the SVP data and plot the sound speed profile as speed of sound (meter/second) versus depth (meters). Position, date, and time were pulled from the SVP header and written into the image (PNG) for reference. Within the same script, the position, Julian day, time, and profile id were also imported into a SpatiaLite (version 4.3.0) enabled SQLite (version 3.26.0) database table. The geographic positions were used to create point geometries for the station locations, and additional fields indicating Survey_ID, Vessel_ID, Device_ID, and SVP_Image were added.
Process_Date: 201910
Process_Step:
Process_Description:
Create Esri shapefile containing the point data:
The SVP point features were added (Add Data) into ArcMap (version 10.7.1) from the SQLite database, then exported (Right click on database feature class > Data > Export Data) to the new Esri point shapefile '2017-001-FA_2017-002-0FA_SVPdata.shp'.
Process_Date: 201910
Process_Step:
Process_Description:
Added keywords section with USGS persistent identifier as theme keyword.
Process_Date: 20200806
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000001
Longitude_Resolution: 0.000001
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257224
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2017-001-FA_2017-002-FA_SVPdata.shp
Entity_Type_Definition:
Sound velocity profile location shapefile for surveys 2017-001-FA and 2017-002-FA (51 point features).
Entity_Type_Definition_Source: U.S. Geological Survey
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: Lon
Attribute_Definition: Decimal degree longitude value in GCS WGS 84.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -75.777222
Range_Domain_Maximum: -74.07
Attribute_Units_of_Measure: degrees
Attribute_Measurement_Resolution: .000001
Attribute:
Attribute_Label: Lat
Attribute_Definition: Decimal degree latitude value in GCS WGS 84.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 35.296667
Range_Domain_Maximum: 37.813333
Attribute_Units_of_Measure: degrees
Attribute_Measurement_Resolution: .000001
Attribute:
Attribute_Label: SVP
Attribute_Definition:
Name of sound velocity profile used to distinguish between casts. Profile names containing 'XBT' refer to the Sippican XBT casts, and those containing 'CTD' refer to Seabird Electronics 911plus CTD casts (in names for XBT casts, the probe type is prepended to 'XBT'; the last two digits in each XBT and CTD casts indicates sequential cast number.)
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: character set
Attribute:
Attribute_Label: Date
Attribute_Definition: mm/dd/yyyy when the SVP cast was collected.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: character set
Attribute:
Attribute_Label: JD_UTC
Attribute_Definition:
Julian day and UTC time when the SVP cast was collected in the format: JD:HH:MM:SS; 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.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: character set
Attribute:
Attribute_Label: SurveyID
Attribute_Definition:
WHMSC field activity identifier (e.g. "2017-001-FA" where 2017 is the survey year, 001 is survey number of that year, and FA is field activity).
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: character set
Attribute:
Attribute_Label: VehicleID
Attribute_Definition: Survey vessel name.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: character set
Attribute:
Attribute_Label: DeviceID
Attribute_Definition: Device used to collect sound speed profile data.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: character set
Attribute:
Attribute_Label: SVP_Image
Attribute_Definition: Name of the PNG image file associated with the SVP cast.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: Character set
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2017-001-FA_2017-002-FA_SVP_ASCII
Entity_Type_Definition:
Sound velocity profile data in Caris SVP (.svp) ASCII format for surveys 2017-001-FA and 2017-002-FA (51 SVP files)
Entity_Type_Definition_Source: U.S. Geological Survey
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2017-001-FA_2017-002-FA_SVP_Images
Entity_Type_Definition:
Portable network graphic images of sound velocity profile data for surveys 2017-001-FA and 2017-002-FA (51 PNG files)
Entity_Type_Definition_Source: U.S. Geological Survey
Overview_Description:
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. In addition to the graphs, the SVP data is also available in Caris .svp formatted ASCII files. The format of the .svp files is as follows:
Header row1: [SVP_VERSION_2] (format version number) Header row2: 2017-001-FA_T4XBT01.svp (cast file name) Header row3: Section 2017-237 23:42:54 37:31:48 -74:18:36 (Caris Section header indicating Year-Day, UTC Time, Degree:Minute:Second Latitude, and Degree:Minute:Second Longitude of cast) Remaining rows: column data of depth (meters) and speed of sound (meters per second) space delimited.
Entity_and_Attribute_Detail_Citation: U.S. Geological Survey
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey - ScienceBase
Contact_Address:
Address_Type: mailing and physical address
Address: Federal Center
Address: Building 810
Address: Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225
Contact_Voice_Telephone: 1-888-275-8747
Resource_Description:
USGS data release of sound velocity profiles collected along the U.S. Atlantic continental shelf break and upper slope between Accomac and Keller Canyons during USGS field activities 2017-001-FA and 2017-002-FA: includes the shapefile '2017-001-FA_2017-002-FA_SVPdata.shp', the zip archive '2017-001-FA_2017-002-FA_SVP_Images.zip' containing 51 PNG images that represent all sound velocity profiles graphically, the zip archive '2017-001-FA_2017-002-FA_SVP_ASCII.zip' containing 51 Caris .svp formatted ASCII files, the browse graphic '2017-001-FA_2017-002-FA_SVPdata_browse.jpg', and the Federal Geographic Data Committee (FGDC) Content Standards for Digital Geospatial Metadata (CSDGM) metadata file '2017-001-FA_2017-002-FA_SVPdata_meta.xml'.
Distribution_Liability:
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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Shapefile
Format_Version_Number: ArcMap 10.7.1
Format_Specification: shapefile
Format_Information_Content:
Shapefile of SVP profile locations collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center along the U.S. Atlantic continental shelf break and upper slope between Accomac and Keller Canyons during USGS field activities 2017-001-FA and 2017-002-FA.
File_Decompression_Technique: none
Transfer_Size: 0.085
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions:
The first link is to the page containing the data. The second is a direct link to download all data available from the page as a zip file. The final link is to the publication landing page. The data page (first link) may have additional data access options, including web services.
Digital_Form:
Digital_Transfer_Information:
Format_Name: TEXT
Format_Version_Number: 0.24
Format_Specification: Caris .svp ASCII text file
Format_Information_Content:
Zip compressed folder containing Caris .svp formatted text files of sound speed profile data collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center along the U.S. Atlantic continental shelf break and upper slope between Accomac and Keller Canyons during USGS field activities 2017-001-FA and 2017-002-FA..
File_Decompression_Technique: any zip utility
Transfer_Size: 1
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions:
The first link is to the page containing the data, the second link downloads all data available from the page as a zip file, and the third link is to the publication landing page.
Digital_Form:
Digital_Transfer_Information:
Format_Name: PNG
Format_Version_Number: Matplotlib (version 2.0.0)
Format_Specification: portable network graphic (PNG)
Format_Information_Content:
Zip compressed folder containing images of the sound speed profiles collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center along the U.S. Atlantic continental shelf break and upper slope between Accomac and Keller Canyons during USGS field activities 2017-001-FA and 2017-002-FA..
File_Decompression_Technique: any zip utility
Transfer_Size: 2.87
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions:
The first link is to the page containing the data, the second link downloads all data available from the page as a zip file, and the third link is to the publication landing page.
Fees: none
Technical_Prerequisites:
To utilize these data, the user must have software capable of reading shapefiles, ASCII text, and/or PNG images.
Metadata_Reference_Information:
Metadata_Date: 20200806
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Wayne E. Baldwin
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2226
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov
Metadata_Standard_Name: fgdc content standards for digital geospatial metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time

This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/SB_data_release/DR_P9Y1MSTN/2017-001-FA_2017-002-FA_SVPdata_meta.html>
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