Split-beam echo sounder - navigation points, tracklines, and profile images for Simrad EK60 split-beam echo sounder data collected during USGS field activities 2017-001-FA and 2017-002-FA.

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Frequently anticipated questions:

What does this data set describe?

Title:
Split-beam echo sounder - navigation points, tracklines, and profile images for Simrad EK60 split-beam echo sounder data collected during USGS field activities 2017-001-FA and 2017-002-FA.
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.
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 is 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.
  1. How might this data set be cited?
    U.S. Geological Survey, 2020, Split-beam echo sounder - navigation points, tracklines, and profile images for Simrad EK60 split-beam echo sounder data collected during USGS field activities 2017-001-FA and 2017-002-FA.: data release DOI:10.5066/P9Y1MSTN, 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.

    Baldwin, Wayne E., Moore, Eric M., Worley, Charles R., Nichols, Alex R., and Ruppel, Carolyn 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.: data release DOI:10.5066/P9Y1MSTN, U.S. Geological Survey, Reston, VA.

    Online Links:

    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.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -76.307108
    East_Bounding_Coordinate: -73.821877
    North_Bounding_Coordinate: 38.818124
    South_Bounding_Coordinate: 35.284219
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/5e1e1472e4b0ecf25c610cfb/?name=2017-001-FA_2017-002-FA_EK60_browse.jpg (JPG)
    Example EK60 split-beam echo sounder profile image.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 04-May-2017
    Ending_Date: 06-Sep-2017
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    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 WGS 1984.
      The ellipsoid used is WGS 84.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257224.
  7. How does the data set describe geographic features?
    2017-001-FA_2017-002-FA_EK60Tracklines
    EK60 Tracklines for surveys 2017-001-FA and 2017-002-FA (701 polyline features). (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.
    LineName
    Name of the trackline along which split-beam echo sounder data were collected in the format: CruiseID-Date-UTCStartTime (i.e.'HRS1704-D20170505-T091927'). (Source: U.S. Geological Survey) Character set
    YJD_init
    Year and Julian day at the start of the survey line; 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
    JDUTC_init
    Julian day and UTC time at the start of the survey line 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. (Source: U.S. Geological Survey) Character set
    YJD_end
    Year and Julian day at the end of the survey line; 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
    JDUTC_end
    Julian day and UTC time at the end of the survey line 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. (Source: U.S. Geological Survey) Character set
    SurveyID
    WHCMSC 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). (Source: U.S. Geological Survey) Character set
    VehicleID
    Survey vessel name. (Source: U.S. Geological Survey) Character set
    DeviceID
    Sonar device used to collect split-beam echo sounder data. (Source: U.S. Geological Survey) Character set
    Length_km
    Length of split-beam echo sounder data line in kilometers (UTM Zone 18N, WGS 84) calculated in the SQLite database. (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.004
    Maximum:66.379
    Units:kilometers
    Resolution:0.001
    EK60_Image
    Name of the EK60 PNG profile image that includes data from the survey line. (Source: U.S. Geological Survey) Character set
    2017-001-FA_2017-002-FA_EK60NavPoints_1min
    EK60 1-minute interval shot points for surveys 2017-001-FA and 2017-002-FA (19840 point features). (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.
    Lon
    Longitude coordinate in decimal degrees, WGS 84 (Source: U.S. Geological Survey)
    Range of values
    Minimum:-76.306684
    Maximum:-73.821880
    Units:degrees
    Resolution:1E-06
    Lat
    Latitude coordinate in decimal degrees, WGS 84 (Source: U.S. Geological Survey)
    Range of values
    Minimum:35.284221
    Maximum:38.818124
    Units:degrees
    Resolution:1E-06
    LineName
    Name of the trackline along which split-beam echo sounder data were collected in the format: CruiseID-Date-UTCStartTime (i.e.'HRS1704-D20170505-T091927'). (Source: U.S. Geological Survey) Character set
    Year_JD
    Year and Julian day for the navigation fix; 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
    JD_UTC
    Julian day and UTC time for of the navigation fix 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. (Source: U.S. Geological Survey) Character set
    SurveyID
    WHCMSC 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). (Source: U.S. Geological Survey) Character set
    VehicleID
    Survey vessel name. (Source: U.S. Geological Survey) Character set
    DeviceID
    Sonar device used to collect split-beam echo sounder data. (Source: U.S. Geological Survey) Character set
    Entity_and_Attribute_Overview:
    The PNG volume backscatter strength (Sv) profile images can be hyperlinked to their corresponding trackline in ArcGIS using the shapefile '2017-001-FA_2017-002-FA_EK60Tracklines.shp'. The 5-minute index annotations along the bottom of the PNG images correlate to the positions of associated times in '2017-001-FA_2017-002-FA_EK60NavPoints_1min.shp'
    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?
    U.S. Geological Survey
    Attn: Wayne Baldwin
    Geologist
    384 Woods Hole Road
    Woods Hole, Massachusetts
    US

    508-548-8700 x2226 (voice)
    508-457-2310 (FAX)
    wbaldwin@usgs.gov

Why was the data set created?

This dataset contains 1-minute navigation points, tracklines, and profile images for approximately 2200 km of Simrad EK60 split-beam echo sounder data collected by the U.S. Geological Survey during USGS field activities 2017-001-FA and 2017-002-FA (also referred to as HRS1704 and HRS1713, respectively) along the U.S. Atlantic continental shelf break and upper continental slope between Baltimore and Keller Canyons. Images of the water column profile data were generated in order to provide portable and easily viewable alternatives to the Simrad .raw versions of the data. Each profile image can be hot linked to its corresponding trackline navigation contained within the Esri polyline shapefile '2017-001-FA_2017-002-FA_EK60Tracklines.shp'. The 5-minute index annotations along the bottom of the PNG images correlate to the positions of associated times in the 1-minute navigation Esri point shapefile '2017-001-FA_2017-002-FA_EK60NavPoints_1min.shp'. This information allows for spatial correlation of the split-beam echo sounder profile images with other geophysical and sample data for investigating water column backscatter in relation to seafloor morphology and stratigraphy in the area.

How was the data set created?

  1. From what previous works were the data drawn?
    raw Simrad EK60 data (source 1 of 1)
    U.S. Geological Survey, unpublished material, raw Simrad EK60 data (.raw).

    Type_of_Source_Media: disc
    Source_Contribution:
    Split-beam echo sounder data were collected using a Simrad EK60 General Purpose Transceiver and ES38-10 split-beam transducer (38 kHz, 10 degree beam width). The ES38-10 transducer was mounted in a frame placed inside the retractable keel of the R/V Hugh R. Sharp, which is located approximately amidships on the center line of the vessel. During cruises 2017-001-FA and 2017-002-FA the frame and transducer were mounted in the forward and rear slots of the retractable keel, respectively. Navigation for the EK60 was initially collected using the ships POS/MV inertial navigation system with intermittent success through May 4 (JD124) of 2017-001-FA, but for the remainder of both cruises navigation was collected using a Hemisphere GPS (GPS) receiver with the GPS antenna mounted on the aft 01 deck handrail approximately 4.57 (2017-001-FA) or 3.4 (2017-002-FA) meters aft and 4 meters to port of the ES38-10 transducer. While underway, the retractable keel was lowered to 1-meter below the hull, resulting in a draft of 5.06 meters below the waterline. Simrad ER60 (version 2.4.3) acquisition software was used to control the EK60 transceiver and digitally log the echogram data and NEMA GPS messages to the Simrad .raw format. Triggering of the EK60 system was slaved to the Reson 7160 MBES while multibeam data were being collected in order to minimize crosstalk between the two instruments, and internally during the remainder of the survey. Data were acquired over record lengths up to 1500 meters (ER60 acquisition software used a constant sound speed of 1494 meters per second for two way travel time to depth conversion) using pulse lengths of 256, 512, and 1204 microseconds with output power ranging between 450 and 1200 Watts. Each of the pulse length used were calibrated using a 60 millimeter copper ball reference sphere prior to survey during each cruise, and the resulting target strength corrections were used to update the beam data.
  2. How were the data generated, processed, and modified?
    Date: Sep-2019 (process 1 of 3)
    PROCESS STEP 1: ESP3 (version 1.3.0), Microsoft Photos 2019, ImageMagick (version 6.9.9-40) and python were used to create volume backscatter strength (Sv) profile images of the split-beam echo sounder data and extract navigation data from the Simrad .raw files. The processing flows and scripts used are summarized below.
    1) Simrad .raw files were imported into ESP3 ('open file') by survey day. Using the 'layer list' tab, input files were evaluated for their time length and quality. Shorter files were concatenated ('merge selected layers') to produce continuous data sections approximately 1 to 4 hours long, and longer files were left as is. Files in which acquisition settings caused changes in sample rate mid-file, an issue that ESP3 recognizes but does not correct for, were generally left unconcatenated or included as the last file in a longer concatenated section (see logical consistency report for a list of files effected by this issue). Settings in the 'Display Options' tab determined several elements of the images produced; 'Data' was always set to 'Sv' (in dB re 1 m-1), X-Scale was always set to 300 seconds (for 5 minute annotation interval), the Y-Scale varied between 10 and 200 meters depending on the duration of the image, and default values were left in remaining fields. For each of the desired output sections, the zoom tool was used to restrict the image area above the deepest sea floor depth, and 'Export > Save Echogram' was used to create an output PNG file of the profile showing depth (meters, relative to instantaneous sea level) along the y-axis (left margin) and UTC time along the profile (labeled at 5-minute intervals), with a color bar scale for Sv (in dB re 1 m-1) along the right margin. Navigation was extracted from all of the Simrad .raw files using 'Export > Export Navigation GPS to .csv/.shp from raw files', specifying the all navigation option, and saved as CSV ASCII text.
    2) Microsoft Photos 2019 was used to crop excess white background area from the output png profile images, then ImageMagick convert was used to reduce the images to 30% of their original size.
    3) The python script pySQL_EK60nav_1m imported the navigation, year, day, and UTC time data from CSV files into a Spatialite (version 4.3.0) enabled SQLite (version 3.26.0) database, creating two tables containing point geometries. The first contained records for all of the input navigation coordinates, and the second maintained records for the first and last fixes in the files, and fixes nearest to even minutes. A 1-minute interval was chosen for convenient correlation to the 5-minute annotation interval provided along the bottom of the profile images. The resulting database columns for each table consist of Lon, Lat (WGS84 dd), LineName, Year_JD, JD_UTC (DDD:HH:MM:SS), SurveyID, VehicleID, and DeviceID. A third table was created to contain trackline geometries generated from all of the input navigation point geometries for each line (sorted by LineName and Time), and the line length in kilometers was calculated. The resulting database columns of the line geometry table consist of LineName, YearJD_init, JDUTC_init, YearJD_end, JDUTC_end, SurveyID, VehicleID, DeviceID, Length_km, and EK60_Image.
    These process steps and all subsequent process steps were conducted by the same person - Wayne Baldwin. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Wayne E. Baldwin
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700 x2226 (voice)
    (508) 457-2310 (FAX)
    wbaldwin@usgs.gov
    Date: Sep-2019 (process 2 of 3)
    PROCESS STEP 2: The EK60 1-minute navigation points and trackline features for each field activity were added (Add Data) into ArcMap (version 10.7) from the SQLite database, then exported (Right click on database feature class >Data> Export Data) to the new Esri polyline shapefiles '2017-001-FA_EK60_NavPoints_1min.shp', '2017-002-FA_EK60_NavPoints_1min.shp', '2017-001-FA_EK60Tracklines.shp', and '2017-002-FA_EK60Tracklines.shp'. The ArcGIS process 'Merge' was used to combine the navigation point and trackline datasets into the single shapefiles '2017-001-FA_2017-002-FA_EK60_NavPoints_1min.shp' and '2017-001-FA_2017-002-FA_EK60Tracklines.shp'.
    Date: 06-Aug-2020 (process 3 of 3)
    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?
    Demopoulos, A., McClain-Counts, J., Bourque, J., Prouty, N., Smith, B., Brooke, S., Ross, S., and Ruppel, C., 2019, 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.: Deep Sea Research Part I 148, pp.53-66, Elsevier, Amsterdam, Netherlands.

    Online Links:

    Leonte, M., Ruppel, C. D., Ruiz‐Angulo, A., and Kessler, J. D., 2020, Surface methane concentrations along the Mid‐Atlantic Bight driven by aerobic subsurface production rather than seafloor gas seeps.: Journal of Geophysical Research: Oceans vol. 125, American Geophysical Union Publications, Washington, DC.

    Online Links:

    Leonte, M., Ruppel, C. D., Ruiz‐Angulo, A., and Kessler, J. D., 2020, 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.: NOAA National Centers for Environmental Information Dataset NCEI Accession 0209090, NOAA National Centers for Environmental Information, Boulder, CO.

    Online Links:

    Ruppel, C., Demopoulos, A., and Prouty, N., 2018, Exploring US Mid-Atlantic Margin Methane Seeps: IMMeRSS, May 2017.: Supplement to Oceanography 31(1), p.93, The Oceanography Society, Rockville, MD.

    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?
    The Simrad ES38-10 split-beam transducer was mounted in a frame placed inside the retractable keel of the R/V Hugh R. Sharp, which is located approximately amidships on the center line of the vessel. During cruises 2017-001-FA and 2017-002-FA the frame and transducer were mounted in the forward and rear slots of the retractable keel, respectively. Navigation for the EK60 was collected using the ships POS MV inertial navigation system with intermittent success through May 4 (JD124) of 2017-001-FA, but for the remainder of both cruises navigation was collected from a Hemisphere GPS (GPS) receiver with the GPS antenna mounted on the aft 01 dark handrail approximately 4.57 (2017-001-FA) or 3.4 (2017-002-FA) meters aft and 4 meters to port of the ES38-10 transducer. Positioning data were recorded as raw NEMA messages to the Simrad .raw files in the Simrad ER60 (version 2.4.0) acquisition software. GPS horizontal positional accuracy is assumed to be within 3 m; horizontal offsets of the transducer relative to the GPS antenna were not accounted for during processing.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    All EK60 data collected during the cruises are represented in these data release files, with the exception of those collected during the system calibration procedures conducted on May 3, (JD123) 17:10 - 20:21 UTC and August 25 (JD237) 12:11 - 14:20 UTC, as well as May 4 (JD124) between 10:29 and 17:09 GMT when data were recorded but without navigation due to serial connection problems. PNG images were not produced for some trackline sections where EK60 data was recorded, but the file was very short or the data were considered particularly poor; in these cases 'no image' is entered in the 'EK60_Image' field of '2017-001-FA_2017-002-FA_SB-EK60Tracklines.shp'.
  5. How consistent are the relationships among the observations, including topology?
    EK60 split-beam echo sounder data were collected nearly continuously throughout cruises 2017-001-FA and 2017-002-FA. Several periods of survey hiatus over one hour in duration were as follows: during 2017-001-FA: May 4 (JD124), ~ 15:00 - 16:50 UTC, while the vessel was forced to evacuate the work zone due to military activity; May 5 (JD125), 10:47 UTC - May 8 (JD128) 00:08 UTC, when ROV maintenance and inclement weather caused survey suspension; May 8 (JD128) 04:42 - 06:47 UTC, during multibeam system testing and troubleshooting; and May 10 (JD130), 01:42 - 02:48 UTC, during a high speed transit between survey sites; and during 2017-002-FA: August 27 (JD239) 10:34 - 14:11 UTC, when logging was suspended during early portion of transit to Norfolk, VA due to inclement weather; and August 27 (JD239) 19:30 UTC - August 30 (JD242) 17:37 UTC, while survey was suspended and the vessel was in port due to inclement weather. The shapefile '2017-002-FA_EK60NavPoints_1min.shp' contains the first (1), last (x), and 1-minute interval navigation fixes for each EK60 trackline. The attribute field 'LineName' for each polyline feature in '2017-001-FA_2017-002-FA_EK60Tracklines.shp' matches the name of the corresponding Simrad .raw acquisition file. Filenames are prepended with HRS1704 and HRS1713, the R/V Hugh Sharp field activity designations for 2017-001-FA and 2017-002-FA, respectively. The 'EK60_Image' attribute field corresponds to the PNG profile images in "'2017-001-FA_2017-002-FA_EK60_Images.zip". In some instances one PNG image exists per raw file, in others PNG images represent the concatenation of multiple raw files. In the case of the later, the name of the PNG image indicates the file range included, eg. the image 'HRS1713_-D20170827-T160948.raw...HRS1713_-D20170827-T175301.raw.png' includes all files between times D20170827-T160948 and D20170827-T175301. As such, a single PNG file can be paired with multiple raw files ('LineName') in '2017-001-FA_2017-002-FA_EK60Tracklines.shp'. The Simrad .raw data were converted to PNG format for ease of display. At some points, acquisition setting changes caused the sample rate of the system to change mid file, an issue which the processing software does not handle properly. As a result, some images contain time periods (mostly toward the end of the files) in which the depth scale is incorrect for data after the sample rate change. These instances are easily recognizable and occur in the following image files: HRS1704-D20170511-T163418.raw.png, HRS1713_-D20170827-T004400.raw.png, HRS1713_-D20170827-T091418.raw.png, HRS1713_-D20170831-T084503.raw.png, HRS1713_-D20170831-T091114.raw...HRS1713_-D20170831-T092942.raw.png, HRS1713_-D20170831-T142123.raw...HRS1713_-D20170831-T152501.raw.png, HRS1713_-D20170831-T161756.raw...HRS1713_-D20170831-T174924.raw.png, HRS1713_-D20170901-T094651.raw...HRS1713_-D20170901-T101116.raw.png, HRS1713_-D20170901-T142600.raw.png, HRS1713_-D20170901-T145353.raw...HRS1713_-D20170901-T154042.raw.png, HRS1713_-D20170901-T180509.raw.png, HRS1713_-D20170902-T032448.raw.png, HRS1713_-D20170903-T052420.raw.png, HRS1713_-D20170903-T093726.raw.png, HRS1713_-D20170903-T130223.raw.png, HRS1713_-D20170903-T174447.raw.png, HRS1713_-D20170903-T175310.raw...HRS1713_-D20170903-T195059.raw.png, HRS1713_-D20170904-T151423.raw.png, HRS1713_-D20170905-T202733.raw...HRS1713_-D20170905-T204307.raw.png, HRS1713_-D20170905-T212717.raw.png, HRS1713_-D20170906-T001017.raw.png, HRS1713_-D20170906-T004638.raw...HRS1713_-D20170906-T013455raw.png, HRS1713_-D20170906-T090408.raw...HRS1713_-D20170906-T101128.raw.png, HRS1713_-D20170906-T155534.raw...HRS1713_-D20170906-T162353.raw.png.

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 distributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the data set.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center
    Denver, CO

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? USGS data release of EK60 split-beam echo sounder data collected along the U.S. Atlantic continental shelf break and upper slope between Baltimore and Keller Canyons during USGS field activities 2017-001-FA and 2017-002-FA: includes '2017-001-FA_2017-002-FA_EK60NavPoints_1min.shp' containing navigation fixes for the start, end, and nearest to even 1-minute time intervals for each file, '2017-001-FA_2017-002-FA_EK60Tracklines.shp' containing trackline features, '2017-001-FA_2017-002-FA_EK60_Images.zip' containing 170 PNG images, the browse graphic '2017-001-FA_2017-002-FA_EK60_browse.jpg', and the Federal Geographic Data Committee (FGDC) Content Standards for Digital Geospatial Metadata (CSDGM) metadata file '2017-001-FA_2017-002-FA_EK60_meta.xml'. These datasets can be downloaded individually or packaged on-demand in a zip file (see the Digital Transfer Option section).
  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?
    To utilize these data, the user must have software capable of reading shapefiles, CSV files, PNG images, and/or SEG-Y seismic trace files.

Who wrote the metadata?

Dates:
Last modified: 06-Aug-2020
Metadata author:
U.S. Geological Survey
Attn: Wayne E. Baldwin
Geologist
384 Woods Hole Rd.
Woods Hole, MA

(508) 548-8700 x2226 (voice)
(508) 457-2310 (FAX)
wbaldwin@usgs.gov
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