Trackline navigation for EG&G Uniboom seismic-reflection data collected by the U.S. Geological Survey during field activities 1974-004-FA and 1975-003-FA offshore of the Delmarva Peninsula (polyline shapefiles)

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Frequently anticipated questions:

What does this data set describe?

Title:
Trackline navigation for EG&G Uniboom seismic-reflection data collected by the U.S. Geological Survey during field activities 1974-004-FA and 1975-003-FA offshore of the Delmarva Peninsula (polyline shapefiles)
Abstract:
Geologic structure and isopach maps were constructed by interpreting over 19,890 trackline kilometers of co-located multichannel boomer, sparker and chirp seismic reflection profiles from the continental shelf of the Delmarva Peninsula, Maryland and Virginia. In this region, Brothers and others (2020) interpret 12 seismic units and 11 regional unconformities. They interpret the infilled channels as Late Tertiary and Quaternary courses of the Susquehanna, Potomac, Rappahannock, York and James Rivers and tributaries, in addition to a broad drainage system. These regional unconformities form a composite unconformity interpreted as the Quaternary-Tertiary (Q-T) unconformity. A depth to Tertiary (Uqt) and total Quaternary sediment thickness (Q) isopach are included with this data release. Other products in this data release include thickness of an early Pleistocene unit (Qbd), thickness of a Pleistocene highstand system tract (Q2), thickness of a post last glacial maximum (LGM) fluvial/estuarine unit (Qcch), thickness of Holocene to modern marine sediment (Qmn), depth to the base of the Persimmons Point and Ocean City paleochannels (U4), depth to the base of the Exmore and Belle Haven paleochannels (U6), depth to the base of the Eastville paleochannel and tributaries (U8), depth to the base (fluvial unconformity) of the Cape Charles paleochannel and tributary paleochannels (fluvial unconformity, U10) and the base (tidal ravinement) of associated Holocene tidal and back-barrier deposits (tidal ravinement surface, U10.5).
  1. How might this data set be cited?
    U.S. Geological Survey, 20230519, Trackline navigation for EG&G Uniboom seismic-reflection data collected by the U.S. Geological Survey during field activities 1974-004-FA and 1975-003-FA offshore of the Delmarva Peninsula (polyline shapefiles): data release DOI:10.5066/P9GQY0ZN, U.S. Geological Survey, Coastal and Marine Hazards and Resources Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Foster, David S., Brothers, Laura L., Baldwin, Wayne E., and Pendleton, Elizabeth A., 2023, Geospatial data layers of shallow geology from the inner continental shelf of the Delmarva Peninsula, including Maryland and Virginia state waters: data release DOI:10.5066/P9GQY0ZN, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    Suggested citation: Foster, D.S., Brothers, L.L., Baldwin, W.E., and Pendleton, E.A., 2023, Geospatial data layers of shallow geology from the continental shelf of the Delmarva Peninsula, Maryland and Virginia: U.S. Geological Survey data release, https://doi.org/10.5066/P9GQY0ZN.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -75.622012
    East_Bounding_Coordinate: -73.837679
    North_Bounding_Coordinate: 38.598022
    South_Bounding_Coordinate: 36.762229
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/6437218cd34ee8d4addcd1fa/?name=USGS_1974-004-FA_1975-003-FA_tracklines_browse.png&allowOpen=true (PNG)
    Browse image of trackline navigation for seismic-reflection data collected by the U.S. Geological Survey during field activities 1974-004-FA (yellow lines) and 1975-003-FA (green lines) offshore of the Delmarva Peninsula.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 15-May-1974
    Ending_Date: 15-May-1975
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Polyline Shapefile
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • String (66)
    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 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
  7. How does the data set describe geographic features?
    USGS_1974-004-FA_tracklines.shp
    Trackline shapefile for USGS field activity 1974-004-FA EG&G Uniboom seismic-reflection data (18 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) Shape type.
    Shape_Leng
    Length of seismic-reflection data line in meters. (Source: Esri)
    Range of values
    Minimum:1456.88867717
    Maximum:65576.5153368
    Units:meters
    Resolution:0.0000001
    File
    Name of the trackline along which seismic-reflection data were collected in the format: YEAR_FIELD ACTIVITY NUMBER_JULIAN DAY_START TIME OF DAY_END TIME OF DAY (i.e.'1974_004_135_1810_2210'). (Source: U.S. Geological Survey) Character set
    USGS_1975-003-FA_tracklines.shp
    Trackline shapefile for USGS field activity 1975-003-FA EG&G Uniboom seismic-reflection data (48 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) Shape type
    Shape_Leng
    Length of seismic-reflection data line in meters. (Source: Esri)
    Range of values
    Minimum:580.579549
    Maximum:46567.6114264
    Units:meters
    Resolution:0.0000001
    File
    Name of the trackline along which seismic-reflection data were collected in the format: YEAR_FIELD ACTIVITY NUMBER_JULIAN DAY_START TIME OF DAY_END TIME OF DAY (i.e.'1975_003_132_1535_1540'). (Source: U.S. Geological Survey) Character set
    Entity_and_Attribute_Overview:
    The shapefiles USGS_1974-004-FA_tracklines.shp and USGS_1975-003-FA_tracklines.shp shows where data from these surveys contributed to the 32-bit GeoTIFF files in this data release. The vector polylines show the distribution and distance between 2-D seismic-reflection profiles.
    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?
    Please recognize the U.S. Geological Survey
  3. To whom should users address questions about the data?
    David S. Foster
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@usgs.gov

Why was the data set created?

This dataset contains trackline navigation for approximately 944 km of EG&G Uniboom seismic-reflection data collected by the U.S. Geological Survey during field activities 1974-004-FA and 1975-003-FA offshore of the Delmarva Peninsula. This information shows the spatial distribution and spacing of single-channel, seismic-reflection data.

How was the data set created?

  1. From what previous works were the data drawn?
    NCEI (1982) (source 1 of 2)
    National Oceanic and Atmospheric Administration (NOAA), National Centers for Environmental Information (NCEI), 19820805, Trackline Geophysical Data: National Centers for Environmental Information (NCEI), Boulder, Colorado.

    Online Links:

    Other_Citation_Details:
    The trackline navigation data that were used to georefrence SEG-Y files and interpret geologic units with Kingdom Suite Software 2d/3dPAK (ver. 2017 - 64-bit) can be requested online National Centers for Environmental Information.
    Type_of_Source_Media: Online
    Source_Contribution:
    These data were used to extend seismic stratigraphic interpretations beyond the extents of USGS field activities 2014-002-FA and 2015-001-FA and Coastal Planning & Engineering (2014). Shallow geologic framework and surficial geology were interpreted from EG&G Uniboom seismic-reflection profiles.
    USGS (1974) (source 2 of 2)
    U.S. Geological Survey, Woods Hole Coastal and Marine Science Center, Data Library, 1974, Loran C navigation paper printout for field activity 1974-004-FA: U.S. Geological Survey, Woods Hole, MA.

    Online Links:

    Other_Citation_Details:
    Copies of navigation data can be requested from the U.S. Geological Survey, Woods Hole Coastal and Marine Science Center, Data Library.
    Type_of_Source_Media: Paper printout
    Source_Contribution:
    These data were used to extend seismic stratigraphic interpretations beyond the extents of USGS field activities 2014-002-FA and 2015-001-FA and Coastal Planning & Engineering (2014). Shallow geologic framework and surficial geology were interpreted from EG&G Uniboom seismic-reflection profiles.
  2. How were the data generated, processed, and modified?
    Date: 2018 (process 1 of 4)
    A scanned image of the Loran C navigation data table printouts for 1974-004-FA were obtained from the U.S. Geological Survey, Woods Hole Coastal and Marine Science Center, Data Library.
    Loran C navigation for 1975-003-FA were downloaded using the National Centers for Environmental Information, Trackline Geophysical Data Viewer in M77T format.
    The contact person for this and all subsequent processing steps below is David S. Foster. Person who carried out this activity:
    David S Foster
    U.S. Geological Survey, Northeast Region
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-4548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@usgs.gov
    Data sources used in this process:
    • USGS (1974) NCEI (1982)
    Date: 2018 (process 2 of 4)
    The 1974-004-FA columns (fields) included Date, Time of Day, Latitude Degrees, Latitude Decimal Minutes, Longitude Degrees, and Longitude Decimal Minutes were manually entered into a Microsoft Excel spreadsheet. New latitude and longitude fields for decimal degrees were calculated. The spreadsheet was saved as a CSV file.
    The 1975-003-FA M77T format file was opened with Microsoft Excel and the fields Date, Time of Day, Latitude Decimal Degrees, and Longitude Decimal Degrees were saved to a spreadsheet in CSV format.
    The following process steps in Excel were the same for 1974-004-FA and 1975-003-FA data:
    1) A field named File was added to the spreadsheets. The field name File relates to the name of the SEG-Y files generated from the scanned TIFF images of the seismic data and is in the format YEAR_FIELD ACTIVITY NUMBER_START JULIAN DAY_START TIME OF DAY_END TIME OF DAY (e.g., 1974_004_135_1810_2210).
    2) A field Shot was created and a shot number that starts at 1 for each file name was created based on the time of day and the known shot rate of 0.5 seconds for the seismic data (1 minute = 120 shots).
    3) New CSV files were saved with the added fields File and Shot.
    Date: 2018 (process 3 of 4)
    The CSV files from the previous step were used to create point shapefiles with ArcCatalog 10.7.1, Create Feature Class From XY Table. The coordinate system was identified as Geographic WGS 72.
    The ArcGIS Tool, Project, was used to transform the shapefiles coordinate systems from Geographic WGS 72 to UTM Zone 18 North WGS 84 and saved as a point feature class.
    XTools Pro, Add XYZ Coordinates added the UTM coordinate pairs.
    XTools Pro, Table to File, created CSV files with UTM coordinate pairs, file name, and shot number. These navigation files were used to load SEG-Y files into Kingdom Suite and were also used in the next process step to interpret the data in Kingdom Suite.
    Date: 2023 (process 4 of 4)
    1) The CSV files created in the previous step was added as a standalone table to an ArcGIS Pro 2.4.1 project map.
    2) Point feature classes were created from these tables using the Geoprocessing Tool, XY Table To Point. The coordinate system was defined as WGS 84 UTM Zone 18 North.
    3) Polyline feature classes were created from the point feature classes using the Geoprocessing Tool, Points To Line. The unique features used the attribute File in the Line Field and in the Sort Field.
    4) The Geoprocessing Tool Feature Class To Shapefile created polyline shapefiles.
    5) The shapefiles names were changed to USGS_1974-004-FA_tracklines.shp and USGS_1975-003-FA_tracklines.shp.
    6) Both shapefiles were reprojected to a Geographic coordinates system to WGS 84 using the ArcMap 10.8.1 Project tool. No datum transformation was needed. Providing the data in a geographic coordinates system simplifies the integration of the dataset with other vector datasets.
    These are the two shapefiles included with this data release: USGS_1974-004-FA_tracklines.shp and USGS_1975-003-FA_tracklines.shp.
  3. What similar or related data should the user be aware of?
    Brothers, Laura L., Foster, David S., Pendleton, Elizabeth A., and Baldwin, Wayne E., 2020, Seismic Stratigraphic Framework of the Continental Shelf Offshore Delmarva, U.S.A.: Implications for Mid-Atlantic Bight Evolution since the Pliocene: Marine Geology Volume 428, October 2020.

    Online Links:

    Other_Citation_Details:
    Use this citation to refer to the seismic stratigraphic units and unconformities represented in the structure surfaces and sediment thickness maps presented in this data release.

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 scanned TIFF images of Uniboom seismic-reflection profiles from USGS field activities 1974-004-FA and 1975-003-FA had a resolution of 300 dpi. The TIFF images were downsampled, before converting to SEG-Y format, to reflect a shot rate of 0.5 seconds. This resulted in one-pixel length in the X dimension per SEG-Y trace. Navigation was with Loran-C, which has an accuracy of 0.1 to 0.25 nautical miles. Navigation fix points were at 10-minute intervals for 1974-004-FA and 5 minute intervals for 1975-003-FA, or at a ship speed of 5 knots, 772 meter and 1543 meter intervals. The datum of WGS 1972 for geographic coordinate pairs were transformed to WGS 84.
  3. How accurate are the heights or depths?
    There are no vertical attributes for the seismic navigation data.
  4. Where are the gaps in the data? What is missing?
    A select portion of USGS seismic-reflection profiles from field activities 1974-004-FA (Julian days 135, 136, 148, and 149) and 1975-003-FA (Julian days 132 to 135) were used to interpret the subsurface geologic units.
  5. How consistent are the relationships among the observations, including topology?
    A select portion of USGS seismic-reflection profiles from field activities 1974-004-FA and 1975-003-FA were used to interpret the subsurface geologic units. All seismic reflection data used in this data release were interpreted by Laura L. Brothers and David S. Foster. David S. Foster conducted the processing steps. Unless stated otherwise, all interpretations, two-way travel time conversions to depth, and horizon gridding were conducted in Kingdom Suite 2017 software.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints None
Use_Constraints Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO
    United States

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? USGS_1974-004-FA_tracklines.shp and USGS_1975-003-FA_tracklines.shp are shapefiles representing the geospatial distribution of EG&G Uniboom seismic-reflection profiles offshore of the Delmarva Peninsula. The dataset also includes a browse graphic file showing the 1974 (yellow) and 1975 (green) tracklines and the associated CSDGM metadata in XML format.
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    To utilize these shapefiles, a GIS software package capable of importing shapefiles is needed.

Who wrote the metadata?

Dates:
Last modified: 19-May-2023
Metadata author:
David S. Foster
U.S. Geological Survey
Geologist
384 Woods Hole Rd.
Woods Hole, MA
USA

508-548-8700 x2271 (voice)
508-457-2310 (FAX)
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:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/SB_data_release/DR_P9GQY0ZN/USGS_1974-004-FA_1975-003-FA_tracklines_meta.faq.html>
Generated by mp version 2.9.51 on Mon May 22 10:21:46 2023