Split-beam Echo Sounder and Navigation Data Collected Using a Simrad EK80 Wide Band Transceiver and ES38-10 Transducer During the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS Field Activity 2018-002-FA

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Wayne E. Baldwin
Originator: Emile M. Bergeron
Originator: David S. Foster
Originator: Eric M. Moore
Originator: Alex R. Nichols
Originator: Tom F. O'Brien
Originator: Nathaniel C. Miller
Originator: Carolyn D. Ruppel
Publication_Date: 20210115
Title:
Split-beam Echo Sounder and Navigation Data Collected Using a Simrad EK80 Wide Band Transceiver and ES38-10 Transducer During the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS Field Activity 2018-002-FA
Edition: 1.0
Geospatial_Data_Presentation_Form: digital data
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P948VJ4X
Publication_Information:
Publication_Place:
Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts
Publisher:
U.S. Geological Survey, Coastal and Marine Hazards and Resources Program
Other_Citation_Details:
Suggested citation: Baldwin, W.E., Bergeron, E.M., Foster, D.S., Moore, E.M., Nichols, A.R., O'Brien, T.F., Miller, N.C., and Ruppel, C.D., 2021, Split-beam echo sounder and navigation data collected using a Simrad EK80 wide band transceiver and ES38-10 transducer during the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS field activity 2018-002-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P948VJ4X.
Online_Linkage: https://doi.org/10.5066/P948VJ4X
Online_Linkage:
Description:
Abstract:
In summer 2018, the U.S. Geological Survey partnered with the U.S Department of Energy and the Bureau of Ocean Energy Management to conduct the Mid-Atlantic Resources Imaging Experiment (MATRIX) as part of the U.S. Geological Survey Gas Hydrates Project. The field program objectives were to acquire high-resolution 2-dimensional multichannel seismic-reflection and split-beam echo sounder data along the U.S Atlantic margin between North Carolina and New Jersey to determine the distribution of methane gas hydrates in below-sea floor sediments and investigate potential connections between gas hydrate dynamics and sea floor methane seepage. MATRIX field work was carried out between August 8 and August 28, 2018 on the research vessel Hugh R. Sharp and resulted in acquisition of more than 2,000 track-line kilometers of multichannel seismic-reflection and co-located split-beam echo sounder data, along with wide-angle seismic reflection and refraction data from 63 expendable sonobuoy deployments.
Purpose:
This dataset contains 1-minute navigation points, tracklines, and profile images for over 3100 km of Simrad EK80 split-beam echo sounder data collected by the U.S. Geological Survey during the Mid-Atlantic Resource Imaging Experiment (MATRIX; field activity 2018-002-FA). The data were acquired along portions of the U.S. Atlantic margin between Virginia and New Jersey to investigate potential connections between seafloor methane seepage and sub-seafloor gas hydrate dynamics. 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. 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.
Supplemental_Information:
This research was supported by USGS Coastal and Marine Hazards and Resources Program, USGS-DOE interagency agreement DE-FE0023495, and USGS-BOEM interagency agreement M17PG00041. Additional information on the field activity is available from https://www.usgs.gov/centers/whcmsc/science/mid-atlantic-resource-imaging-experiment-matrix?qt-science_center_objects=0#qt-science_center_objects and https://cmgds.marine.usgs.gov/fan_info.php?fan=2018-002-FA.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20180809
Ending_Date: 20180828
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -74.838809
East_Bounding_Coordinate: -70.887187
North_Bounding_Coordinate: 39.029336
South_Bounding_Coordinate: 34.780431
Keywords:
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: Bureau of Ocean Energy Management
Theme_Keyword: BOEM
Theme_Keyword: Department of Energy
Theme_Keyword: DOE
Theme_Keyword: Mid-Atlantic Resources Imaging Experiment
Theme_Keyword: MATRIX
Theme_Keyword: field activity number 2018-002-FA
Theme_Keyword: HRS1807
Theme_Keyword: R/V Hugh R. Sharp
Theme_Keyword: split-beam echo sounder
Theme_Keyword: scientific echo sounder
Theme_Keyword: split-beam echo sounder profile
Theme_Keyword: shapefile
Theme_Keyword: navigation
Theme_Keyword: Simrad raw format
Theme_Keyword: Simrad EK80 wide band transceiver
Theme_Keyword: Simrad ES38-10 transducer
Theme_Keyword: image
Theme_Keyword: PNG
Theme_Keyword: marine geophysics
Theme_Keyword: oceanography
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: location
Theme_Keyword: geoscientificInformation
Theme_Keyword: oceans
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: sonar methods
Theme_Keyword: marine geophysics
Theme_Keyword: navigational data
Theme_Keyword: geospatial datasets
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:5f4fdafa82ce4c3d123502e7
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: United States of America
Place_Keyword: Atlantic Ocean
Place_Keyword: Mid-Atlantic Margin
Place_Keyword: U.S. Economic Exclusive Zone
Place_Keyword: North Carolina
Place_Keyword: Virginia
Place_Keyword: Maryland
Place_Keyword: Delaware
Place_Keyword: New Jersey
Place_Keyword: Cape Hatteras
Temporal:
Temporal_Keyword_Thesaurus: none
Temporal_Keyword: 2018
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.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Wayne E. Baldwin
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: Massachusetts
Postal_Code: 02543-1598
Country: US
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: Split-beam echo sounder browse image.
Browse_Graphic_File_Type: JPEG
Cross_Reference:
Citation_Information:
Originator: Wayne Baldwin
Originator: David Foster
Originator: Emile Bergeron
Originator: Peter Dal Ferro
Originator: Jennifer McKee
Originator: Eric Moore
Originator: Alex Nichols
Originator: Thomas O'Brien
Originator: Dan Powers
Originator: Nathaniel Miller
Originator: Carolyn Ruppel
Publication_Date: 2020
Title:
Multichannel Seismic-Reflection and Navigation Data Collected Using Sercel GI Guns and Geometrics GeoEel Digital Streamers During the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS Field Activity 2018-002-FA
Edition: 1.0
Geospatial_Data_Presentation_Form: digital data
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P91WP1RZ
Publication_Information:
Publication_Place:
Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts
Publisher:
U.S. Geological Survey, Coastal and Marine Hazards and Resources Program
Other_Citation_Details:
Suggested citation: Baldwin, W.E., Foster, D.S., Bergeron, E.M., Dal Ferro, P., McKee, J.A., Moore, E.M., Nichols, A.R., O'Brien, T.F., Powers, D., Miller, N.C., and Ruppel, C.D., 2020, Multichannel seismic-reflection and navigation data collected using Sercel GI guns and Geometrics GeoEel digital streamers during the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS field activity 2018-002-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P91WP1RZ.
Online_Linkage: https://doi.org/10.5066/P91WP1RZ
Online_Linkage:
Data_Quality_Information:
Logical_Consistency_Report:
Raw file start times indicated by the last six digits of 'LineName' in '2018-002-FA_EK80Tracklines.shp' and '2018-002-FA_EK80NavPoints_1min.shp' lag between 2 and 7 seconds behind corresponding start times indicated by 'JDUTC_init' in '2018-002-FA_EK80Tracklines.shp' and 'JD_UTC' for the first point record of each file in '2018-002-FA_EK80NavPoints_1min.shp'. This inconsistency stems from utilizing an automatic file change function based on file size limit during acquisition, which resulted in raw files containing a time range of NMEA GPS navigation messages spanning from the second ping of the file to several seconds beyond the start of the subsequent file. The 'LineName' for each polyline feature in '2018-002-FA_EK80Tracklines.shp' matches the prefix name of the corresponding Simrad raw (*.raw) acquisition file. The 'EK80_Image' attribute field corresponds to the PNG profile images in '2018-002-FA_EK80_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 '2018-002-FA_-D20180809-T010303.raw...2018-002-FA_-D20180809-T020751.raw.png' includes all files between times D20180809-T010303 and D20180809-T020751. As such, a single PNG file can be paired with multiple raw files ('LineName') in '2018-002-FA_EK80Tracklines.shp'. The Simrad raw data were converted to PNG format for ease of display. At some points during surveying, 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: 2018-002-FA_-D20180813-T092858.raw.png, 2018-002-FA_-D20180813-T152001.raw...2018-002-FA_-D20180813-T160055.raw.png, 2018-002-FA_-D20180813-T184840.raw...2018-002-FA_-D20180813-T210511.raw.png, 2018-002-FA_-D20180814-T003330.raw...2018-002-FA_-D20180814-T010923.raw.png, 2018-002-FA_-D20180814-T013421.raw.png, 2018-002-FA_-D20180814-T053926.raw...2018-002-FA_-D20180814-T073126.raw.png, 2018-002-FA_-D20180814-T074421.raw...2018-002-FA_-D20180814-T092921.raw.png, 2018-002-FA_-D20180814-T095822.raw...2018-002-FA_-D20180814-T104310.raw.png, 2018-002-FA_-D20180814-T212344.raw.png, 2018-002-FA_-D20180816-T234125.raw.png, 2018-002-FA_-D20180817-T042357.raw.png, 2018-002-FA_-D20180817-T053517.raw.png, 2018-002-FA_-D20180817-T093116.raw.png, 2018-002-FA_-D20180817-T153926.raw...2018-002-FA_-D20180817-T181627.raw.png, 2018-002-FA_-D20180820-T200257.raw...2018-002-FA_-D20180820-T211427.raw.png, 2018-002-FA_-D20180822-T025003.raw.png, 2018-002-FA_-D20180822-T041139.raw.png, 2018-002-FA_-D20180822-T043538.raw...2018-002-FA_-D20180822-T052129.raw.png, 2018-002-FA_-D20180823-T125001.raw...2018-002-FA_-D20180823-T143704.raw.png. Data acquired between Aug. 9 (JD221) 06:10 and Aug. 10 (JD222) 14:20 UTC, during the transit between the calibration site and the site of MCS equipment deployment, only extend to 2400 meters water depth, and did not capture the entire water column including the seafloor.
Completeness_Report:
EK80 data were collected over two continuous legs that extended August 8-18 and August 19-28, 2018. All data collected during the cruise are represented in these data release files, with the exception of those collected during the system calibration and testing conducted Aug. 8 (JD220) 17:47 through Aug. 9 (JD221) 01:03 UTC, as well as Aug. 28 (JD240) between 12:11 and 12:43 UTC when data were recorded but without navigation due to serial connection problems (no trackline exists for this file in '2018-002-FA_MCS_cmpTracklines.shp' but data for this time period are included in '2018-002-FA_-D20180828-T104720.raw...2018-002-FA_-D20180828-T121157.raw.png). Survey was halted for returns to port Aug. 18 (JD230) 00:41 through Aug. 19 (JD231) 16:14 UTC for refueling and Aug. 22 (JD234) 06:14 and Aug 23 (JD235) 00:06 UTC due to inclement weather. Data were also not collected Aug. 23 (JD235) 05:06 - 11:45 UTC during deployment of the multichannel seismic gear and Aug. 16 (JD228) between 01:39 and 02:26 UTC during an interruption in the ships power. PNG images were not produced for some trackline sections where EK80 data was recorded, but the files were unable to be imported into the ESP3 software; in these cases 'no image available' is entered in the 'EK80_Image' field of '2018-002-FA_MCS_cmpTracklines.shp'.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
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 2018-002-FA the frame and transducer were mounted in the rear slot of the retractable keel. Navigation for the EK80 was collected using a Wide Area Augmentation System (WAAS) enabled Hemisphere R131 Differential GPS (DGPS) receiver with the navigational reference point (NRP) antenna mounted on the aft 01 deck handrail approximately 3.4 meters aft of the ES38-10 transducer. Positioning data were recorded as raw NMEA messages to the Simrad raw files in the Simrad EK80 (version 1.12.2.0) 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.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
A constant sound speed of 1536.3 meters per second was used in the Simrad EK80 (version 1.12.2.0) acquisition and ESP3 (version 1.8.1) processing software packages to convert two-way travel times to water depths. Water depths indicated on the vertical axis of the PNG profile images are referenced to instantaneous sea level, no corrections for ship motion (heave, pitch, roll) or tides have been applied. While no direct assessment of vertical accuracy has been conducted, we conservatively estimate that processed data are accurate to within 1% of the water depth.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: unpublished material
Title: raw Simrad EK80 data (*.raw)
Geospatial_Data_Presentation_Form: digital data
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20180809
Ending_Date: 20180828
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: raw Simrad EK80 data
Source_Contribution:
Split-beam echo sounder data were collected using a Simrad EK80 wide band 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 (rear of three slots) of the R/V Hugh R. Sharp, which is located approximately amidships on the center line of the vessel. Navigation for the EK80 was collected using a Wide Area Augmentation System (WAAS) enabled Hemisphere R131 Differential GPS (DGPS) receiver with the GPS antenna mounted on the aft 01 dark handrail approximately 3.4 meters aft 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 EK80 (version 1.12.2.0) acquisition software was used to control the EK80 transceiver and digitally log the echogram data and NMEA GPS messages to the Simrad raw format. Data were acquired over record lengths up to 4000 meters (EK80 acquisition software used a constant sound speed of 1536.3 meters per second for two way travel time to depth conversion) using pulse lengths of 256, 512, 1204, and 2048 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 the start of survey and the resulting target strength corrections were used to update the beam data.
Process_Step:
Process_Description:
PROCESS STEP 1: ESP3 (version 1.8.1) and python were used to create volume backscatter strength (Sv) profile images of the split-beam echo sounder data, extract navigation data from the Simrad raw files, and process the extracted navigation data. The processing flows 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 not concatenated 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 referenced to 1 inverse meter), X-Scale was always set to 300 seconds (for 5 minute annotation interval), the Y-Scale varied between 10 and 500 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 to be 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 referenced to 1 inverse meter) along the right margin. Navigation was extracted from all the Simrad raw files using 'Export > Export Navigation GPS to .csv or shapefile from raw files', specifying the all navigation option, and saved as CSV ASCII text.
2) The python notebook EK80_ESP3NavProc.ipynb utilized Pandas (version 0.25.1) 'read_csv' to import data from the CSV ASCII files into a dataframe containing columns for filename, Pandas datetime (UTC time), latitude, and longitude. Longitude values were converted from positive degrees measured from the zero degree origin to negative values in the western hemisphere (by subtracting 360 degrees), Pandas datetimes were rounded to the nearest second, and new records with navigation coordinates at even one minute datetimes were interpolated between the input time bounds of each filename. The dataframe was recast to produce a new dataframe with columns for longitude (Lon), latitude (Lat), linename (LineName), a combined year and Julian day string (Year_JD), and a combined Julian day and UTC time string (JD_UTC); the last two were produced via the Pandas datetime string function. Additional columns were added to contain survey (Survey_ID), device (Device_ID), and vessel (Vehicle_ID) identifier strings. A subset of the data, maintaining the first, last, and even one minute time records for each filename, was stored in an additional dataframe. The 1-minute interval was chosen for convenient correlation to the 5-minute annotation interval provided along the bottom of the PNG profile images. Pandas 'to_sql' was used to create and populate SQL database tables from the complete and 1-minute subset navigation dataframes within a Spatialite (version 4.3.0) enabled SQLite (version 3.3.0) database. 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. SQLite operations created ('AddGeometryColumn') and populated ('Update') point geometry columns in each of the new tables from the navigation coordinates. A third database table was created with a line string geometry column ('Create Table' and 'AddGeometryColumn') to contain tracklines generated ('Insert') from the complete set of input navigation point geometries for each line (sorted by LineName and UTC Time), and the line length in kilometers was calculated. The trackline database table was updated to include columns for the year and Julian day and Julian day and time of the first and last (YJD_inti, JDUTC_init, YJD_end, and JDUTC_end) navigation records for each filename. The resulting database columns of the line geometry table consist of LineName, YJD_init, JDUTC_init, YJD_end, JDUTC_end, SurveyID, VehicleID, DeviceID, and Length_km.
These process steps and all subsequent process steps were conducted by the same person - Wayne Baldwin.
Process_Date: 202012
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Wayne E. Baldwin
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:
PROCESS STEP 2: The EK80 1-minute navigation points and trackline features were added (Add Data) into ArcGIS Pro (version 2.3.3) from the SQLite database, then exported (using the Feature Class to Feature Class geoprocessing tool) to the new Esri polyline shapefiles '2018-002-FA_EK80NavPoints_1min.shp' and '2018-002-FA_EK80Tracklines.shp'. The field 'EK80_Image' was added (Add Field) to the attribute table of '2018-002-FA_EK80Tracklines.shp' and manually populated by entering the name of the PNG profile image encompassing the time period for each raw filename.
Process_Date: 202012
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: WGS 1984
Ellipsoid_Name: WGS 84
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257224
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2018-002-FA_EK80Tracklines
Entity_Type_Definition: EK80 Tracklines for survey 2018-002-FA (605 polyline 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: LineName
Attribute_Definition:
Name of the trackline along which split-beam echo sounder data were collected in the format: CruiseID_-Date-UTCStartTime (i.e.'2018-002-FA_-D20180809-T010303').
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: Character set
Attribute:
Attribute_Label: YJD_init
Attribute_Definition:
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.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: Character set
Attribute:
Attribute_Label: JDUTC_init
Attribute_Definition:
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.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: Character set
Attribute:
Attribute_Label: YJD_end
Attribute_Definition:
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.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: Character set
Attribute:
Attribute_Label: JDUTC_end
Attribute_Definition:
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.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: Character set
Attribute:
Attribute_Label: SurveyID
Attribute_Definition:
WHCMSC field activity identifier (e.g. "2018-002-FA" where 2018 is the survey year, 002 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: Sonar device used to collect split-beam echo sounder data.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: Character set
Attribute:
Attribute_Label: Length_km
Attribute_Definition:
Length of split-beam echo sounder data line in kilometers (UTM Zone 18N, WGS 84) calculated in the SQLite database.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.213
Range_Domain_Maximum: 32.598
Attribute_Units_of_Measure: kilometers
Attribute_Measurement_Resolution: 0.001
Attribute:
Attribute_Label: EK80_Image
Attribute_Definition:
Name of the EK80 PNG profile image that includes data from the survey line. If no image is available for the survey line, the value is set to "no image available".
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: Character set
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2018-002-FA_EK80NavPoints_1min
Entity_Type_Definition:
EK80 1-minute interval shot points for survey 2018-002-FA (25,328 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:
Longitude coordinate in decimal degrees, WGS 84, negative value indicates Western hemisphere.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -74.838809
Range_Domain_Maximum: -70.887205
Attribute_Units_of_Measure: degrees
Attribute_Measurement_Resolution: 1E-06
Attribute:
Attribute_Label: Lat
Attribute_Definition: Latitude coordinate in decimal degrees, WGS 84
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 34.780446
Range_Domain_Maximum: 39.029334
Attribute_Units_of_Measure: degrees
Attribute_Measurement_Resolution: 1E-06
Attribute:
Attribute_Label: LineName
Attribute_Definition:
Name of the trackline along which split-beam echo sounder data were collected in the format: CruiseID_-Date-UTCStartTime (i.e.'2018-002-FA_-D20180809-T010303').
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: Character set
Attribute:
Attribute_Label: Year_JD
Attribute_Definition:
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.
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 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.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: Character set
Attribute:
Attribute_Label: SurveyID
Attribute_Definition:
WHCMSC field activity identifier (e.g. "2018-002-FA" where 2018 is the survey year, 002 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: Sonar device used to collect split-beam echo sounder data.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Unrepresentable_Domain: Character set
Detailed_Description:
Entity_Type:
Entity_Type_Label: 2018-002-FA_EK80_Images
Entity_Type_Definition:
Portable network graphic images of EK80 volume backscatter strength (Sv) profiles for survey 2018-002-FA (183 PNG images).
Entity_Type_Definition_Source: U.S. Geological Survey
Overview_Description:
Entity_and_Attribute_Overview:
The PNG profile images show volume backscatter strength (Sv) measured along the survey trackline. The y-axis (left margin) indicates depth in meters (relative to instantaneous sea level), the x-axis indicates UTC time along the profile trackline (labeled at 5-minute intervals), and the color bar along the right margin indicates Sv (in dB referenced to 1 inverse meter). The PNG images can be hyperlinked to their corresponding trackline in ArcGIS using the shapefile '2018-002-FA_EK80Tracklines.shp'. The 5-minute index annotations along the bottom of the PNG images correlate to the positions of associated times in '2018-002-FA_EK80NavPoints_1min.shp'.
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: Denver 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
Contact_Electronic_Mail_Address: sciencebase@usgs.gov
Resource_Description:
USGS data release of EK80 split-beam echo sounder data collected during the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS field activity 2018-002-FA: includes '2018-002-FA_EK80NavPoints_1min.shp' containing navigation fixes for the start, end, and even 1-minute time intervals for each file, '2018-002-FA_EK80Tracklines.shp' containing trackline features, '2018-002-FA_EK80_Images.zip' containing 183 PNG images, the browse graphic '2018-002-FA_EK80BrowseImage.jpg', and the Federal Geographic Data Committee (FGDC) Content Standards for Digital Geospatial Metadata (CSDGM) metadata file '2018-002-FA_EK80_meta.xml'. These datasets can be downloaded individually or packaged on-demand in a zip file (see the Digital Transfer Option section).
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. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), and have been processed successfully on a computer system at the 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. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, firm, or product 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: ArcGIS Pro 2.3.3
Format_Specification: Shapefile
Format_Information_Content:
Shapefile of EK80 tracklines collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center during the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS field activity 2018-002-FA and the associated metadata.
File_Decompression_Technique: none
Transfer_Size: 7.1
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.
Digital_Form:
Digital_Transfer_Information:
Format_Name: Shapefile
Format_Version_Number: ArcGIS Pro 2.3.3
Format_Specification: Shapefile
Format_Information_Content:
Shapefile of EK80 1-minute navigation collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center during the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS field activity 2018-002-FA and the associated metadata.
File_Decompression_Technique: none
Transfer_Size: 38.8
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: ESP3 (version 1.8.1)
Format_Specification: Portable Network Graphic (PNG)
Format_Information_Content:
Zip compressed folder containing EK80 volume backscatter strength (Sv) profile images collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center during the Mid-Atlantic Resource Imaging Experiment (MATRIX), USGS field activity 2018-002-FA and the associated metadata.
File_Decompression_Technique: any zip utility
Transfer_Size: 1218.76
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 and PNG images.
Metadata_Reference_Information:
Metadata_Date: 20210115
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Wayne E. Baldwin
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical
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 Standard 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_P948VJ4X/2018-002-FA_EK80_meta.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:19:00 2021