Trackline navigation for Swath interferometric data collected by the U.S. Geological Survey along the Delmarva Peninsula, MD and VA, 2014 (Esri polyline shapefile, GCS WGS 84)

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Frequently anticipated questions:

What does this data set describe?

Title:
Trackline navigation for Swath interferometric data collected by the U.S. Geological Survey along the Delmarva Peninsula, MD and VA, 2014 (Esri polyline shapefile, GCS WGS 84)
Abstract:
The Delmarva Peninsula is a 220-kilometer-long headland, spit, and barrier island complex that was significantly affected by Hurricane Sandy. A U.S. Geological Survey cruise was conducted in the summer of 2014 to map the inner continental shelf of the Delmarva Peninsula using geophysical and sampling techniques to define the geologic framework that governs coastal system evolution at storm-event and longer timescales. Data collected during the 2014 cruise include swath bathymetry, sidescan sonar, chirp and boomer seismic-reflection profiles, acoustic Doppler current profiler, and sample and bottom photograph data. Processed data in raster and vector format are released here for the swath bathymetry, sidescan sonar, and seismic-reflection profiles. More information about the USGS survey conducted as part of the Hurricane Sandy Response-- Geologic Framework and Coastal Vulnerability Study can be found at the project website or on the WHCMSC Field Activity Web pages: https://woodshole.er.usgs.gov/project-pages/delmarva/ and https://cmgds.marine.usgs.gov/fan_info.php?fan=2014-002-FA
  1. How might this data set be cited?
    U.S. Geological Survey, 2015, Trackline navigation for Swath interferometric data collected by the U.S. Geological Survey along the Delmarva Peninsula, MD and VA, 2014 (Esri polyline shapefile, GCS WGS 84): data release DOI:10.5066/F7MW2F60, 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.

    Pendleton, Elizabeth A., Ackerman, S.D., Baldwin, W.E., Danforth, W.W., Foster, D.S., Thieler, E.R., and Brothers, L.L., 2015, High-resolution geophysical data collected along the Delmarva Peninsula 2014, U.S. Geological Survey Field Activity 2014-002-FA: data release DOI:10.5066/F7MW2F60, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -75.567695
    East_Bounding_Coordinate: -74.687529
    North_Bounding_Coordinate: 38.430403
    South_Bounding_Coordinate: 37.538209
  3. What does it look like?
    https://cmgds.marine.usgs.gov/data/field-activity-data/2014-002-FA/data/bathymetry/Swath_tracks.png (PNG)
    Woods Hole Coastal and Marine Science Center Swath Bathymetry tracklines along the Delmarva Peninsula
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 18-Jun-2014
    Ending_Date: 22-Jul-2014
    Currentness_Reference:
    ground condition; data were not collected on 20140702-20140704; 20140709; and 20140714-20140715 due to weather.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector digital data
  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):
      • Entity point (39)
    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 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?
    2014_002_FA_Swath_Tracklines
    Swath tracklines for survey 2014-002-FA along the Delmarva Peninsula (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 swath bathymetric data was collected (Source: U.S. Geological Survey) String up to 254 characters
    yrjd
    Year and julian date that data were collected in format: YYYY-JD; where 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 string
    jd_time
    julian day and UTC time of data collection in 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) String up to 254 characters
    vessel
    Survey vessel name (Source: U.S. Geological Survey) String up to 254 characters
    uniqueline
    Unique filename; in the format YYYY_SSS_TTTTTT where YYYY is the year of the survey, SSS is the survey id number and TTTTTT is the name of the trackline along which swath bathymetric data were collected (Source: U.S. Geological Survey) String up to 254 characters
    jd_tim_end
    JulianDay:HH:MM:SS of the end of line (Source: U.S. Geological Survey) String up to 254 characters
    length_km
    Length of swath data line in kilometers (UTM Zone 18N, WGS84) (Source: U.S. Geological Survey)
    Range of values
    Minimum:0.07
    Maximum:28.8144
    Units:kilometers
    Resolution:0.001
    DeviceID
    Sonar device used to collect swath bathymetry (Source: U.S. Geological Survey) String up to 254 characters
    VehicleID
    Survey vessel name (Source: U.S. Geological Survey) String up to 254 characters
    SurveyID
    WHCMSC field activity identifier (e.g. "2014-002-FA" where 2014 is the survey year, 002 is survey number of that year, and FA is Field Activity) (Source: U.S. Geological Survey) String up to 254 characters

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?
    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2259 (voice)
    508-457-2310 (FAX)
    ependleton@usgs.gov

Why was the data set created?

This dataset contains trackline navigation for approximately 4500 km of Swath interferometric bathymetry data collected by the U.S. Geological Survey during cruise 2014-002-FA along the Delmarva Peninsula, MD and VA. This information can help spatially correlate the bathymetric data with other data in the GIS.

How was the data set created?

  1. From what previous works were the data drawn?
    raw bathymetry (source 1 of 1)
    U.S. Geological Survey, Unpublished Material, raw swath navigation.

    Type_of_Source_Media: disc
    Source_Contribution:
    USGS used a 234 kHz Systems Engineering and Assessment Ltd. (SEA) SWATHplus interferometric sonar mounted on the port side of the M/V Scarlett Isabella. Survey lines were run at an average speed of 5 knots and were spaced 200 m apart in the nearshore to approximately 3-km apart in the offshore. Full data coverage was obtained for sidescan sonar data, but not for bathymetric data. The SEA SWATHplus-M operates at a frequency of 234 kHz and a variable range (increased or decreased manually depending on water depth, but generally 85 m on both sides). The system was operated with a transmit power of 80 percent, a transmit length of 43 cycles, and 4096 samples per channel. Sound-velocity profiles were collected continuously with an ODIM MVP30 moving vessel profiler. Tides were corrected using a zone tidal model with observed tides from gauges in Atlantic City, NJ; Lewes, DE; Chesapeake Bay-Bridge-Tunnel, VA; and Duck, NC.
  2. How were the data generated, processed, and modified?
    Date: 2014 (process 1 of 8)
    2014-002-FA: Raw to Processed Conversion: Survey navigation information is stored within each raw (sxr) data file. Each raw SWATHPlus bathymetric sonar file (sxr) was converted to a SWATHPlus processed file (sxp) using SEA SWATHPlus Swath Processor (ver. 3.10.04). Person who carried out this activity:
    Elizabeth Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2259 (voice)
    (508) 457-2310 (FAX)
    ependleton@usgs.gov
    Date: 2014 (process 2 of 8)
    CARIS Processing: A new Computer Aided Resource Information System (CARIS) Hydrographic Information Processing System (HIPS) project (ver. 9.0) was created with projection information set to Universal Transverse Mercator (UTM) Zone 18, WGS84. Each SWATHPlus processed file (sxp) was imported to the new CARIS project using the Import/Conversion Wizard. Navigation was checked and edited as needed using the Navigation Editor tool. Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2315 (voice)
    (508) 457-2310 (FAX)
    sackerman@usgs.gov
    Date: 2014 (process 3 of 8)
    Perl and AWK (no version) programming scripts were used to extract and subsample the navigation fixes stored in the CARIS HIPS database. The processing flow for this step follows: A. Extract navigation for each line in CARIS HDCS directory using Perl script do_CARIS_nav3.pl (which runs the CARIS program printfnav for all the lines in the HDCS dir). (Extracted navigation file is tab-delimited in format YYYY-JD HH:MM:SS:FFF DD.LAT DD.LONG SSSSS_VVVVV_YYYY-JD_LLLL AR where YYYY=year, JD=Julian Day, HH=hour, MM=minute, SS=seconds, FFF=fractions of a second, DD.LAT=latitude in decimal degrees, DD.LONG=longitude in decimal degrees, SSSSS=survey name, VVVVV=vessel name, LLLL=linename, AR=accepted or rejected navigation fix) This step creates the file combined.txt B. The navigation files extracted from CARIS HIPS contained 4-5 navigation fixes per second. These files were subsampled to produce files containing 1 fix per second using AWK to remove the fractions-of-a-second from the time column then grabbing the first occurrence of each second. AWK was also used to eliminate spurious fixes outside the survey area and reformat the navigation for conversion from comma separated value (CSV) data to Esri point feature class Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700 x2315 (voice)
    (508) 457-2310 (FAX)
    sackerman@usgs.gov
    Date: 2014 (process 4 of 8)
    In ArcCatalog (version 10.2), navigation text in CSV format was converted to a point feature class by right-clicking on the comma separated value text file -- Create Feature Class -- from XY table using the defined projection Geographic (Decimal_Degrees_WGS84.prj). Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov
    Date: 2014 (process 5 of 8)
    VAC Extras tool (version: 4.1 FeatConv - Points to Line v2; USGS in-house software) was then used within ArcMap (version 10.2) to convert the navigation points to a trackline shapefile. The 'uniqueline' field was used to define which points were used to generate each polyline feature, and the first occurrence of fields 'linename', 'yrjd', 'jd_time', 'vessel', and the last occurrence of 'jd_tim_end' were chosen to be included as attributes in the output shapefile. The trackline shapefile was checked to ensure there were no severely spurious navigation fixes. XTools Pro (version 10.2.1257) for ArcGIS desktop was used (Table Operations - Table Restructure) to reorganize and add fields to the polyline shapefile's attribute table. The length field ('Length_km') was also added and then populated using 'Calculate Geometry' (Property = Length, Use coordinate system of the data frame = WGS 1984 UTM Zone 18N, Unit = Kilometers), which can be accessed by right clicking on the attribute field name in the table view. Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508) 548-8700 x2315 (voice)
    (508) 457-2310 (FAX)
    Date: 18-Apr-2017 (process 6 of 8)
    The online links to the data were updated to reflect the new server hosting the data. Additionally, other small edits could be made to the metadata, such as modifying http to https where appropriate. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. 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
    Date: 20-Jul-2018 (process 7 of 8)
    USGS Thesaurus keywords added to the keyword section. 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
    Date: 08-Sep-2020 (process 8 of 8)
    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?

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?
    Navigation was acquired with a Coda Octopus F185 Differential Global Positioning System + Wide Area Augmentation System (DGPS+WAAS), which is accurate to + or - 1 to 2 meters, horizontally and RTK positioning from an Ashtech Proflex 800, which is accurate to less than 1-meter, horizontally. X,Y data are referenced to WGS84. The SWATHPlus transducers were mounted on a rigid pole, approximately 4.195 m below the water line, along the port side of the M/V Scarlett Isabella. The DGPS antenna and an Ashtech ProFlex 800 RTK GPS were located on the same pole approximately 4.6m above the sea surface. RTCM corrections were being delivered via the web (ethernet) to the Ashtech ProFlex 800 from shore stations in MD and VA (ethernet satellite link is from a KVH Mini-VSAT Broadband receiver). The RTK corrections were passed through to the F185R giving the submetrix system kinematic (x,y) positioning accuracy from Julian Day 170 and later. Lines (l1f1-l7f1) collected prior to 20140719 at 12:40:00 UTC were recorded with WAAS-enabled DGPS because the F185 was not receiving RTCM corrections from the Ashtech ProFlex800. Positional offsets from antennae to MRU were corrected within the SWATHPlus acquisition software. WAAS enabled DGPS accuracy is estimated to be less than 3 m and the accuracy of RTK-GPS is estimated to be less than 1 m.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    This shapefile includes trackline navigation from all the swath bathymetric data that was collected within the survey area. However, only quality sonar data along the main survey lines were included in the final bathymetry grid. Noisy or poor quality data were not included in the grid, but the line navigation are included in this shapefile. Data from some survey lines were omitted where they overlapped with equal or better quality data (for example lines l148f2 and l19f3 are nearly collocated and only data from l148f2 are included in the grid because attitude positioning was not useable from l19f3). Data along tie and transit lines were not included in the final grid or in the navigation shapefile.
  5. How consistent are the relationships among the observations, including topology?
    Any spurious data points were removed during processing.

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 as the originator of the dataset.
  1. Who distributes the data set? (Distributor 1 of 1)
    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2259 (voice)
    (508) 457-2310 (FAX)
    ependleton@usgs.gov
  2. What's the catalog number I need to order this data set? USGS data release 2014-002-FA Swath tracklines from the Delmarva Peninsula area (2014-002-FA_Swathtracks.zip). The zip file contains a folder with the following a shapefile (2014_002_FA_Swath_Tracklines.shp), A browse graphic (Swath_tracks.png) and FGDC CSDGM metadata files (2014_002_FA_Swath_Tracklines.xml) in four standard formats are also included in the zip file.
  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?
    This zip file contains data available shapefile format. The user must have software capable of reading shapefile forrmat to use these data

Who wrote the metadata?

Dates:
Last modified: 18-Mar-2024
Metadata author:
Elizabeth Pendleton
U.S. Geological Survey
Geologist
384 Woods Hole Rd.
Woods Hole, MA

(508) 548-8700x2259 (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 USGS. (updated on 20240318)
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/field_activities/2014_002_fa/2014_002_FA_Swath_Tracklines.faq.html>
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