Metadata: Identification_Information: Citation: Citation_Information: Originator: David S. Foster Publication_Date: 20231114 Title: Chirp seismic reflection - shotpoints, tracklines, profile images, and SEG-Y traces for EdgeTech SB-424 chirp data collected during USGS field activity 2021-004-FA (point and polyline shapefiles, CSV text, PNG Images, and SEGY data, GCS WGS 84) Edition: 1.0 Geospatial_Data_Presentation_Form: Shapefile, CSV, PNG Image, SEG-Y Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9GO90TI 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 Online_Linkage: https://doi.org/10.5066/P9GO90TI Online_Linkage: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9GO90TI/ Larger_Work_Citation: Citation_Information: Originator: Seth D. Ackerman Originator: David S. Foster Originator: Charles R. Worley Originator: Alexander R. Nichols Publication_Date: 2023 Title: High-resolution geophysical and geological data collected from outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA Edition: 1.0 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9GO90TI Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Other_Citation_Details: Suggested citation: Ackerman, S.D., Foster, D.S., Worley, C.R., and Nichols, A.R., 2023, High-resolution geophysical and geological data collected from outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9GO90TI. Online_Linkage: https://doi.org/10.5066/P9GO90TI Online_Linkage: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9GO90TI/ Description: Abstract: The U.S. Geological Survey (USGS) Woods Hole Coastal and Marine Science Center (WHCMSC) completed a bathymetric and shallow seismic-reflection survey during the period of June 9, 2021 to June 24, 2021 in water depths from 2 m to 30 m for a portion of the outer Cape Cod nearshore environment between Marconi and Nauset Beaches. The products from this survey will help to support white shark research on their shallow-water behavior in the dynamic nearshore environment at Cape Cod National Seashore (CACO). CACO visitors’ safety is threatened by interactions between the public and white sharks. This project provides CACO with baseline data and information on nearshore white shark habitat, specifically in the nearshore shoreface, bathymetric trough, and longshore bar. This data release provides the geophysical data collected from outer Cape Cod during USGS Field Activities 2021-002-FA in 2021. Purpose: This dataset contains shotpoint and trackline navigation, profile images, and raw SEG-Y trace data for approximately 358 km of EdgeTech SB424 chirp seismic-reflection data collected by the U.S. Geological Survey during USGS field activity 2021-004-FA from outer Cape Cod. Images of each seismic profile were generated in order to provide portable and easily viewable alternatives to the SEG-Y versions of the data. Each profile image can be hyperlinked to its corresponding trackline navigation contained within the Esri polyline shapefile '2021-002-FA_SB424Tracklines.shp'. Shotpoint index and tick marks along the top of the PNG images correlate to the positions of 500 shot intervals within the Esri point shapefile '2021-004-FA_SB424sht500.shp'. This information allows for spatial correlation of chirp seismic-reflection profiles images with other geophysical data for investigating sea-floor morphology and stratigraphy in the area. Supplemental_Information: Support for 2021-004-FA was provided to the USGS from the National Park Service, Cape Cod National Seashore. Additional information on the field activities associated with this project are available at https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-004-FA Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20210609 Ending_Date: 20210624 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -69.977142 East_Bounding_Coordinate: -69.915425 North_Bounding_Coordinate: 41.942144 South_Bounding_Coordinate: 41.78285 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:53410027-97cc-42f7-a74f-1c0b15d2a158 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: location Theme_Keyword: geoscientificInformation Theme_Keyword: oceans 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: Cape Cod National Seashore Theme_Keyword: CACO Theme_Keyword: National Park Service Theme_Keyword: NPS Theme_Keyword: Massachusetts Office of Coastal Zone Management Theme_Keyword: CZM Theme_Keyword: MassCZM Theme_Keyword: field activity number 2021-004-FA Theme_Keyword: RV Rafael Theme_Keyword: shapefile Theme_Keyword: trackline navigation Theme_Keyword: seismic navigation Theme_Keyword: seismic reflection Theme_Keyword: seismic profile Theme_Keyword: SEG-Y traces Theme_Keyword: chirp Theme_Keyword: EdgeTech Theme_Keyword: SB-424 Theme_Keyword: image Theme_Keyword: PNG Theme_Keyword: marine geology Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: seismic reflection methods Theme_Keyword: sub-bottom profiling Theme_Keyword: marine geophysics Theme_Keyword: marine geology Theme_Keyword: navigational data Theme_Keyword: geospatial datasets Place: Place_Keyword_Thesaurus: None Place_Keyword: United States of America Place_Keyword: Atlantic Ocean Place_Keyword: Atlantic Margin Place_Keyword: Cape Cod Place_Keyword: Massachusetts Place_Keyword: Orleans Place_Keyword: Eastham Place_Keyword: Wellfleet Place_Keyword: Marconi Beach Place_Keyword: Nauset Beach Stratum: Stratum_Keyword_Thesaurus: None Stratum_Keyword: sea floor Stratum_Keyword: seafloor Temporal: Temporal_Keyword_Thesaurus: none Temporal_Keyword: 2021 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: David S. Foster Contact_Organization: U.S. Geological Survey 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 x2271 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: dfoster@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://cmgds.marine.usgs.gov/data-releases/media/2022/10.5066-P9GO90TI/f5a2ef99418a4c0897c1871ab811c086/2021-004-FA_SB424Tracklines_browse.jpg Browse_Graphic_File_Description: chirp seismic-reflection navigation trackline. Browse_Graphic_File_Type: JPEG Cross_Reference: Citation_Information: Originator: Norris, M.W. Originator: Faichney, A.K. Publication_Date: 2002 Title: SEG-Y rev. 1 Data Exchange Format - SEG Technical Standards Committee Geospatial_Data_Presentation_Form: document Publication_Information: Publication_Place: Tulsa, OK Publisher: Society of Exploration Geophysicists Online_Linkage: https://library.seg.org/pb-assets/technical-standards/seg_y_rev1-1686080991247.pdf Data_Quality_Information: Logical_Consistency_Report: Chirp seismic-reflection data were collected from June 9 through 24. '2021-004-FA_SB424sht500.shp' contains the first, last, and 500-interval shotpoints for each seismic trackline, and '2021-004-FA_SB424_shtnav.csv' contains all unique shot point navigation. The attribute fields 'LineName' and 'ImageName' for each polyline feature in '2021-004-FA_SB424Tracklines.shp' correspond to the SEG-Y data files in '2021-004-FA_SB424_SegyData.zip' and the PNG profile images in "2021-004-FA_SB424_Images.zip", respectively. One SEG-Y file, and PNG image exists for each feature. Processed seismic data were converted to PNG format for ease of seismic trace display. Quality control was conducted during processing. Completeness_Report: Sections of tracklines where navigation was recorded but no seismic data were logged are not included such as during testing, some turns, and very short files. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The EdgeTech SB-424 subbottom profiler tow vehicle was pole mounted on the port aft quarter of the RV Rafael. The transducers were 1 m below the water line, and approximately 1 meter astern of the DGPS antenna mounted aft on the cabin top. Navigation data for the SB-424 were collected using a Hemisphere DGPS receiver with the antenna mounted on the aft main cabin top. Positioning data were recorded using SonarWiz 7 (version 7.07.06) acquisition software, which logged geographic coordinates to individual trace headers in SEG-Y format. DGPS horizontal positional accuracy is assumed to be within 2 m. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: unpublished material Title: SB-424 SEG-Y trace data Geospatial_Data_Presentation_Form: SEG-Y Type_of_Source_Media: disc Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20210609 Ending_Date: 20210624 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: SEG-Y SB-424 data Source_Contribution: The EdgeTech SB-424 subbottom profiler tow vehicle was pole mounted on the port aft quarter of the RV Rafael. The transducers were 1 m below the water line, and approximately 1 meter astern of the DGPS antenna mounted on the cabin top. Chirp seismic data were collected using an EdgeTech Geo-Star FSSB sub-bottom profiling system and an SB-424 towfish. SonarWiz 7 (version 7.07.06) seismic acquisition software was used to control the Geo-Star FSSB topside unit, digitally log three trace data (envelope, real, and imaginary) in the SEG-Y Rev. 1 format (IEEE floating point), and record GPS navigation coordinates to the SEG-Y trace headers (in arc seconds of Latitude and Longitude, multiplied by a scalar of 100). SonarWiz recorded heave values from the heave, pitch, and roll data that came from the POSMV IMU to the SEG-Y header bytes 189-190 as 16-bit integer in cm*10 units. Data were acquired using 25-ms shot rates, a 10-ms pulse length, and a 4 to 20 kHz frequency sweep. Traces were recorded with a 23-microsecond sample interval with a trace length of 100 ms. Process_Step: Process_Description: PROCESS STEP 1: Shearwater Reveal (version 4.1), and Python 2.7.6 were used to process SEG-Y data and extract navigation data. The processing flows and scripts used are summarized below and in the following processing steps. 1) The Reveal flow 001_ read424_segy.flow called the module SegyTapeRead that reads the raw SEG-Y files containing the envelope, real, and imaginary trace data. The following SEG-Y trace headers were mapped and saved as Reveal headers: FFID, Channel, Source X and Y, Year, Day, Hour, Minute, Second, and Heave (derived from POS MV IMU) in bytes 189-190 (16-bit integer). HeaderMath and UTMLatLong converted the navigation reference point (NRP) lat/lon positions from seconds of arc to decimal degrees, projected them to UTM Zone 19N WGS 84 meters, and wrote each to new header words (NRP_LAT, NRP_LON, NRP_X, and NRP_Y). Finally, Output wrote the envelope-detected traces and the real traces to separate new files '*.seis' in the internal Reveal format. 2) The Reveal flow 002_layback_stat.flow applied static corrections to account for a draft depth (1 m) of the SB-424 pole-mounted tow vehicle and to remove heave. The heave from the Reveal header Heave (cm*10) was converted using HeaderMath to two-way travel time (TWT) milliseconds (ms) by dividing by -750 (assumes a velocity of 1500 m/s and account for negative values are down in the POSMV data). ApplyStatic shifted the trace data from the converted TWT heave values. File MB_Line-0001, MB_Line-0002, MB_Line-0003, MB_Line-0003a, MB_Line-0003b. MB_Line-0004, MB_Line-0004a, and MB_Transit-0001 did not have values for heave in the raw SEG-Y files. For these files, a custom Python module ObspyPicking was used to pick the sea floor. HeaderFiltering was used to apply a 51 trace smoothing filter to the sea floor picks. ApplyStatic used the difference between the picked sea floor and the smoothed sea floor was used to shift and remove heave effects. The Reveal flow 002_layback_stat.flow also applied the custom Python module ShotlineLayback (developed by Nathan Miller of USGS-WHCMSC) defined the horizontal offset between the GPS antenna and the pole-mounted SB-424( approximately 1 m astern). The algorithm interpolated a sail line from the navigation reference point positions (NRP_X and NRP_Y), then computed layback positions for the shots by translating them back along the sail line by the total offset and wrote the calculated layback positions to new header words (SRC_X, SRC_Y, REC_X, REC_Y). UTMLatLong converted the layback positions from UTM Zone 19N WGS 84 meters to decimal degrees and wrote each to new header words (NRP_LAT, NRP_LON, SRC_LAT, SRC_LON, REC_LAT, and REC_LON). HeaderMath converted the layback REC_LAT and REC_LON values from decimal degrees to seconds of arc with a scalar of 100, and set header words for navigation coordinate units (geographic seconds of arc with scalar) and time basis code (UTC). Output wrote the processed traces to new SEG-Y and Reveal seis format files that included static corrections and layback positions. 3) The static and layback corrected SEG-Y files were imported to Kingdom Suite (v. 2017) using the layback navigation. The sea-floor reflection was picked using 2Dhunt and manually edited when needed. The picked sea floor was exported as CSV files with columns File Name, FFID, and two-way travel time. Grep was used to select individual records by File Name and write individual CSV files for each file. The Reveal flow 003_chirp_gain used the module DBMerge matched FFID in the CSV files with the Reveal FFID headers and created a new Reveal header for the sea floor picks (SFTWT). HeaderMath converted the SFTWT two-way travel time in seconds to a new header SFTWT_MS in milliseconds (ms). 4) The Reveal module TraceMath applied a time-dependent gain function relative to the header SFT_MS. TraceMath supports the special variables SAMPLE and TIME where SAMPLE is the value of each input sample and the variable TIME to the z coordinate of the trace in ms. The following equation was applied: sample = ifelse(TIME > SFTWT_MS - 3, sample * pow((TIME-(SFTWT_MS-3))/1000,1), 0) The function pow(a, b) where a=TIME-(SFTWT_MS-1)/1000 is raised to the power of b (1). New SEG-Y and Reveal files were written with the gain function applied. 5) A Seismic Unix (version 4.2) script read424 was used to read the gain applied SEG-Y files with the gain function applied. The layback corrected coordinates were extracted from SEG-Y headers and written to a Seismic Unix file. Along with the extracted coordinates, other SEG-Y trace header information, including shot number, year, Julian day, and time of day (UTC) were extracted. Header information from each SEG-Y file was saved to text files after an AWK (no version) filter was used to maintain the first and last shots, shots at multiples of 500 and shots with unique navigation coordinates. Geographic coordinates (WGS 84) were converted to UTM zone 19 N coordinates (WGS 84) using Proj (version 4.6.0). End shots and shots at multiples of 500 may not have unique navigation coordinates. Separate text files containing the first and last shots and even 500 shot intervals were also saved. A 500 shot interval was chosen because it corresponds to the annotation interval provided along the top of the seismic-reflection profile images. Read424 called a Python script 424itoSQL_21004.py, written by Wayne Baldwin, which imported the CSV files to a Spatialite (version 4.3.0) enabled SQLite (version 3.21.0) database, creating three tables containing point geometries for the unique and 500 shotpoint navigation and trackline features. These process steps and all subsequent process steps were conducted by the same person - David S. Foster. Process_Date: 20220304 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: David S. Foster 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 x2271 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: dfoster@usgs.gov Process_Step: Process_Description: PROCESS STEP 2: The SB-424 500 shot and trackline features were added (Add Data) into ArcGIS Pro (version 2.4.1) from the SQLite database, then exported with the Geoprocessing, Feature Class To Shapefile tool to new Esri polyline shapefiles '2021-004-FA_SB424_sht500.shp' and '2021-004-FA_SB424Tracklines.shp', respectively. Process_Date: 20220304 Process_Step: Process_Description: PROCESS STEP 3: The Seismic Unix (version 4.2), script Plot424 created variable density postscript plots of the seismic profiles showing two-way travel time (seconds) along the y-axis (left margin) and shots along profile (labeled at 500 shot intervals) on the x-axis (along top of profile). The postscript images were converted to 200 dpi portable network graphic (PNG) images using ImageMagick (version 7.0.10-37). The plots are labeled along the bottom of the X axis. Plots with fewer than approximately 1000 traces may have truncated x-axis labels. Process_Date: 20220308 Process_Step: Process_Description: PROCESS STEP 4: The SEGY data were updated to include the publication DOI url in the headers. Process_Date: 20221114 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: 2021-004-FA_SB424Tracklines.shp Entity_Type_Definition: SB-424 Trackline shapefile for survey 2021-004-FA (93 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 seismic-reflection data were collected in the format: Area_Line-FileNumber (e.g., 'MB_Line-0001'). Area MB = Marconi Beach and Area NB = Nauset Beach. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: ImageName Attribute_Definition: PNG image name of seismic-reflection profile corresponding to survey line. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: Shot_init Attribute_Definition: Shot number at the start of the survey line. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 4950 Attribute_Units_of_Measure: shot Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: Shot_end Attribute_Definition: Shot number at the end of the survey line. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 316 Range_Domain_Maximum: 17912 Attribute_Units_of_Measure: shot Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: Year Attribute_Definition: Calendar year the data were collected Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: JD_UTC_ini 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: JD_UTC_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., "2021-004-FA" where 2021 is the survey year, 004 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 seismic-reflection data. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: Length_km Attribute_Definition: Length of seismic-reflection data line in kilometers (UTM Zone 19N, WGS 84) calculated in the SQLite database. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.208 Range_Domain_Maximum: 12.216 Attribute_Units_of_Measure: kilometers Attribute_Measurement_Resolution: 0.001 Detailed_Description: Entity_Type: Entity_Type_Label: 2021-004-FA_SB424sht500.shp Entity_Type_Definition: SB424 500-interval shot point shapefile for survey 2021-004-FA (1149 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: East Attribute_Definition: Easting coordinate in UTM Zone 19 N meters, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 418995.94 Range_Domain_Maximum: 423992.93 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: .01 Attribute: Attribute_Label: North Attribute_Definition: Northing coordinate in UTM Zone 19 N meters, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 4626081.95 Range_Domain_Maximum: 4643794.43 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: .01 Attribute: Attribute_Label: Lon Attribute_Definition: Longitude coordinate in decimal degrees, WGS 84 Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -69.915425 Range_Domain_Maximum: -69.977142 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: 41.78285 Range_Domain_Maximum: 41.942144 Attribute_Units_of_Measure: degrees Attribute_Measurement_Resolution: 1E-06 Attribute: Attribute_Label: LineName Attribute_Definition: Name of the trackline along which seismic-reflection data were collected in the format: Area_Line-FileNumber (e.g., 'MB_Line-0001'). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: ImageName Attribute_Definition: PNG image name of seismic-reflection profile corresponding to survey line. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Attribute: Attribute_Label: Shot Attribute_Definition: Shot number (values are first, last, and every 500 shot between). Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1 Range_Domain_Maximum: 17912 Attribute_Units_of_Measure: shot Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: Year Attribute_Definition: Year the data were collected YYYY. 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 first, last, and every 500 shot point between 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., "2021-004-FA" where 2021 is the survey year, 004 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 seismic-reflection data. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set Detailed_Description: Entity_Type: Entity_Type_Label: 2021-004-FA_SB424_shtnav.csv Entity_Type_Definition: SB424 shot point comma separated values file for survey 2021-004-FA (499910 point features). The fields of this CSV file are the same as the shapefile attributes described above (East,North,Lon,Lat,LineName,ImageName,Shot,Year,JD_UTC,SurveyID,VehicleID,DeviceID) Entity_Type_Definition_Source: U.S. Geological Survey Overview_Description: Entity_and_Attribute_Overview: The column headings and range domain values in '2021-004-FA_SB424_shtnav.csv' match those in '2021-004-FA_SB424sht500.shp'. The PNG seismic reflection images can be hyperlinked to their corresponding trackline or shotpoint locations in ArcGIS using the shapefiles '2021-004-FA_SB424Tracklines.shp' or '2021-004-FA_SB424sht500.shp', respectively. The fist, last, and multiple of 500 shot features in '2021-004-FA_SB424sht500.shp' correspond to the x-axis ticks on the PNG images, which show two-way travel time (seconds) on the y-axis and distance along profile (annotation at 500 shot intervals) on the x-axis. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Coastal and Marine Hazards and Resources Program 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 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov Resource_Description: USGS data release of EdgeTech SB424 chirp seismic-reflection data collected in outer Cape Cod during USGS field activity 2021-004-FA: includes '2021-004-FA_SB424sht500.shp' containing the first, last and 500-interval shotpoint locations, '2021-004-FA_SB424shtnav.csv' containing unique shot point locations, '2021-004-FA_SB424Tracklines.shp' containing trackline features, '2021-004-FA_SB424_Images.zip' containing 616 PNG images named according to line convention, '2021-004-FA_SB424_SegyData.zip' containing 93 SEG-Y files of the processed traces, the browse graphic 2021-004-FA_SB424Tracklines_browse.jpg, and Federal Geographic Data Committee (FGDC) Content Standards for Digital Geospatial Metadata (CSDGM) metadata file '2021-004-FA_SB424_meta.xml'. These datasets can be downloaded individually (see the Digital Transfer Option section). Distribution_Liability: Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Shapefile Format_Version_Number: ArcGISPro 2.4.1 Format_Specification: Shapefile Format_Information_Content: Zip file containing the shapefiles of SB424 shotpoints and tracklines collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center in outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA and the associated metadata. File_Decompression_Technique: Use any zip decompression utility Transfer_Size: 8.3 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2022/10.5066-P9GO90TI/5d19b873dfde4da989429adb2c3c61be/2021-004-FA_SB424_Shapefiles.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9GO90TI/ Network_Resource_Name: https://doi.org/10.5066/P9GO90TI Access_Instructions: The data can be downloaded using the Network Resource Name links. The first link is a direct link to download the zipped file of data. The second and third links are to a landing page for the entire data release where the data, metadata, and browse graphic can be downloaded. Digital_Form: Digital_Transfer_Information: Format_Name: CSV Format_Version_Number: none Format_Specification: Comma-Separated Values (CSV) Format_Information_Content: Zip compressed CSV file of SB424 unique shotpoints collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center in outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA and the associated metadata. File_Decompression_Technique: Use any zip decompression utility Transfer_Size: 7 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2022/10.5066-P9GO90TI/6212acbe910743948df4e0c6cb210a88/2021-004-FA_SB424_shtnav.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9GO90TI/ Network_Resource_Name: https://doi.org/10.5066/P9GO90TI Access_Instructions: The data can be downloaded using the Network Resource Name links. The first link is a direct link to download the zipped file of data. The second and third links are to a landing page for the entire data release where the data, metadata, and browse graphic can be downloaded. Digital_Form: Digital_Transfer_Information: Format_Name: PNG Format_Version_Number: ImageMagick (version 7.0.10-37) Format_Specification: Portable Network Graphic (PNG) Format_Information_Content: Zip compressed folder containing SB424 seismic reflection profile images collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center in outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA and the associated metadata. File_Decompression_Technique: Use any zip decompression utility Transfer_Size: 732.9 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2022/10.5066-P9GO90TI/e883205c99a3472f8ee9bb5acccbc1ca/2021-004-FA_SB424_Images.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9GO90TI/ Network_Resource_Name: https://doi.org/10.5066/P9GO90TI Access_Instructions: The data can be downloaded using the Network Resource Name links. The first link is a direct link to download the zipped file of data. The second and third links are to a landing page for the entire data release where the data, metadata, and browse graphic can be downloaded. Digital_Form: Digital_Transfer_Information: Format_Name: SEG-Y Format_Version_Number: SEG-Y Rev. 1 Format_Specification: SEG-Y Format_Information_Content: Zip compressed folder containing processed SB424 seismic reflection trace data collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center in outer Cape Cod, Massachusetts during USGS Field Activity 2021-004-FA and the associated metadata. File_Decompression_Technique: Use any zip decompression utility Transfer_Size: 6700 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/media/2022/10.5066-P9GO90TI/6feb88c0ecc04c95b892dfa0545e156a/2021-004-FA_SB424_SegyData.zip Network_Resource_Name: https://cmgds.marine.usgs.gov/data-releases/datarelease/10.5066-P9GO90TI/ Network_Resource_Name: https://doi.org/10.5066/P9GO90TI Access_Instructions: The data can be downloaded using the Network Resource Name links. The first link is a direct link to download the zipped file of data. The second and third links are to a landing page for the entire data release where the data, metadata, and browse graphic can be downloaded. Fees: none Technical_Prerequisites: To utilize these data, the user must have software capable of reading shapefiles, CSV files, PNG images, and/or SEG-Y seismic trace files. Metadata_Reference_Information: Metadata_Date: 20231114 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: David S. Foster 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 x2271 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov Contact_Instructions: The metadata contact email address is a generic address in the event the person is no longer with the USGS. Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time