Coastal Bathymetry Data Collected in 2016 nearshore from West Ship Island to Horn Island, Gulf Islands National Seashore, Mississippi, U.S. Geological Survey (USGS).

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Frequently anticipated questions:


What does this data set describe?

Title:
Coastal Bathymetry Data Collected in 2016 nearshore from West Ship Island to Horn Island, Gulf Islands National Seashore, Mississippi, U.S. Geological Survey (USGS).
Abstract:
The United States Geological Survey Saint Petersburg Coastal and Marine Science Center (USGS SPCMSC), in cooperation with the United States Army Corps of Engineers (USACE) conducted bathymetric surveys of the nearshore waters surrounding Ship and Horn Islands, Gulf Islands National Seashore, Mississippi (GUIS). Camille Cut separates Ship Island into East Ship Island and West Ship Island. The objective of this study was to establish base-level elevation conditions around West Ship Island, East Ship Island, Horn Island and their associated active littoral system prior to restoration activities. These activities include the closure of Camille Cut and the placement of sediment in the littoral zone of West Ship Island. This survey will be used to verify sediment migration patterns by monitoring elevation change over time. The dataset produced by this survey will also be compared with historic bathymetric datasets to help further understand island elevation over time. This data release provides 667-line kilometers (km) of processed Single-Beam Bathymetry (SBB) data and 773-line km of processed Interferometric Bathymetry (IFB) collected by the USGS SPCMSC in July 2016 (field activity number [FAN] 2016-347-FA). The IFB data were acquired aboard the Research Vessel (RV) Sallenger (subFAN, 16BIM04), and the SBB data were acquired aboard the RV Jabba Jaw (subFAN, 16BIM05) and the RV Mako (subFAN, 16BIM06). The IFB and SBB point data are provided in three datums: 1) the International Terrestrial Reference Frame of 2000 (ITRF00), ellipsoid height (-49.70 meters [m] to -28.87 m); 2) the North American Datum of 1983 (NAD83) CORS96 realization and the North American Vertical Datum 1988 (NAVD88) with respect to the GEOID12B model (-0.07 m to -20.69 m); and 3) NAD83 (CORS96) and Mean Lower Low Water (MLLW) (-0.04 m to -20.60 m). This metadata record describes the comprehensive, 50-meter (m) Digital Elevation Model (DEM) created from the IFB and SBB point data and provided in NAD83 NAVD88 GEOID12B. For additional information regarding data collection and processing, please refer to the field logs and formal Federal Geographic Data Committee (FGDC) metadata for the individual XYZ point data files and survey trackline shapefiles also included within this data release (https://doi.org/10.5066/F7B8571Q).
Supplemental_Information:
The swath bathymetry data were collected and processed in the World Geodetic System of 1984 (WGS84 [G1762]), which is equivalent to the International Terrestrial Reference Frame of 2008 (ITRF08). The processed IFB data (Ship_ Horn_Island_2016_IFB_ITRF00_5m_xyz.txt) values are not the individual soundings but are the exported BASE (Bathymetry with Associated Statistical Error) surface at 5-m spatial distances with associated CUBE (Combined Uncertainty and Bathymetry Estimator) sample surface created from the edited soundings dataset using CARIS HIPS and SIPS version 9.1. These are considered interpolated samples in which one value represents all soundings within a 5-m node, weighted by uncertainty and proximity, giving the final value as a data sample within the specific grid cell. This 5-m BASE surface was exported as x,y,z point data in comma delimited ASCII format then converted to ITRF00 for merging with the single-beam datasets.
Using the National Oceanic and Atmospheric Administration (NOAA) VDatum version 3.6 transformation software (http://vdatum.noaa.gov/) the IFB dataset was subsequently transformed to the North American Datum of 1983 (NAD83) and North American Vertical Datum of 1988 (NAVD88) with respect to the GEOID12B model and finally into NAD83 and Mean Lower Low Water (MLLW), for inclusion in this data release.
  1. How might this data set be cited?
    DeWitt, Nancy T., Stalk, Chelsea A., Fredericks, Jake J., Flocks, James G., Kelso, Kyle W., Farmer, Andrew S., Tuten, Thomas M., and Buster, Noreen A., 20170930, Coastal Bathymetry Data Collected in 2016 nearshore from West Ship Island to Horn Island, Gulf Islands National Seashore, Mississippi, U.S. Geological Survey (USGS).: U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -89.003523
    East_Bounding_Coordinate: -88.500240
    North_Bounding_Coordinate: 30.266183
    South_Bounding_Coordinate: 30.187717
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 13-Jul-2016
    Ending_Date: 19-Jul-2016
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Series_Information Series_Name
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set.
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 16
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -87.000000
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000.0
      False_Northing: 0.0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 5.00000
      Ordinates (y-coordinates) are specified to the nearest 5.00000
      Planar coordinates are specified in meters
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: International Reference Frame 2000 (ITRF00)
      Depth_Resolution: 0.01
      Depth_Distance_Units: meter
      Depth_Encoding_Method: Implicit coordinate
  7. How does the data set describe geographic features?
    Ship_Horn_Island_2016_IFB_ITRF00_5m_xyz.txt
    ASCII text file containing the processed interferometric bathymetry x,y,z point data in the International Terrestrial Reference Frame of 2000 (ITRF00). (Source: USGS)
    ITRF00_X
    ITRF00 X-coordinate (easting) of sample point, in meters (Source: VDatum version 3.6)
    Range of values
    Minimum:307249.9992
    Maximum:355579.9993
    ITRF00_Y
    ITRF00 Y-coordinate (northing) of sample point, in meters (Source: VDatum version 3.6)
    Range of values
    Minimum:3341279.9645
    Maximum:3349234.9645
    Ellipsoid
    ITRF00 ellipsoid height of sample point, in meters (Source: VDatum version 3.6)
    Range of values
    Minimum:-48.1905
    Maximum:-29.5335
    DataType
    The data type of the xyz point - IFB (Interferometric Bathymetry) (Source: USGS) IFB
    Year
    The year the data were collected (Source: USGS) 2016
    Ship_Horn_Island_2016_IFB_NAD83_NAVD88_GEOID12B_5m_xyz.txt
    ASCII text file containing the processed interferometric bathymetry x,y,z point data in the NAD83 and the NAVD88 with respect to the GEOID12B model. (Source: VDatum version 3.6)
    NAD83_X
    NAD83 X-coordinate (easting) of sample point, in meters (Source: VDatum version 3.6)
    Range of values
    Minimum:307250.778
    Maximum:355580.7673
    NAD83_Y
    NAD83 Y-coordinate (easting) of sample point, in meters (Source: VDatum version 3.6)
    Range of values
    Minimum:3341279.3725
    Maximum:3349234.3724
    NAVD88_G12B
    The Z-coordinate in NAVD88 (orthometric height) of sample point, in meters (Source: VDatum version 3.6)
    Range of values
    Minimum:-19.180
    Maximum:-0.683
    NAD83_Long
    NAD83 Longitude-coordinate of sample point, in decimal degrees (Source: VDatum version 3.6)
    Range of values
    Minimum:-89.002563
    Maximum:-88.500687
    NAD83_Lat
    NAD83 Latitude-coordinate of sample point, in decimal degrees (Source: VDatum version 3.6)
    Range of values
    Minimum:30.193266
    Maximum:30.262108
    Year
    The year the data were collected (Source: USGS) 2016
    DataType
    The data type of the xyz point - IFB (Interferometric Bathymetry) (Source: USGS) IFB
    Ship_Horn_Island_2016_IFB_NAD83_MLLW_5m_xyz.txt
    ASCII text file containing the processed interferometric bathymetry x,y,z point data in NAD83 and MLLLW. (Source: VDatum version 3.6)
    NAD83_X
    NAD83 X-coordinate (easting) of sample point, in meters (Source: VDatum version 3.6)
    Range of values
    Minimum:307250.778
    Maximum:355580.7673
    NAD83_Y
    NAD83 Y-coordinate (easting) of sample point, in meters (Source: VDatum version 3.6)
    Range of values
    Minimum:3341279.3725
    Maximum:3349234.3724
    MLLW
    The Z-coordinate in MLLW of sample point, in meters (Source: VDatum version 3.6)
    Range of values
    Minimum:-19.098
    Maximum:-0.6059
    NAD83_Long
    NAD83 Longitude-coordinate of sample point, in decimal degrees. (Source: VDatum version 3.6)
    Range of values
    Minimum:-89.002563
    Maximum:-88.500687
    NAD83_Lat
    NAD83 Latitude-coordinate of sample point, in decimal degrees (Source: VDatum version 3.6)
    Range of values
    Minimum:30.193266
    Maximum:30.262108
    DataType
    The data type of the xyz point - IFB (Interferometric Bathymetry) (Source: USGS) IFB
    Year
    The year the data were collected (Source: USGS) 2016
    Ship_Horn_Island_2016_IFB_ITRF00_tracklines.shp and Ship_Horn_Island_2016_IFB_NAD83_tracklines.shp
    Esri shapefile containing the survey tracklines for the interferometric bathymetry data collected in July 2016, during USGS FAN 2015-347-FA (subFAN 16BIM04), nearhore Ship and Horn Island, Mississippi. (Source: USGS)
    FID
    Internal feature number. (Source: Esri) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry (Source: Esri) Polyline is the geometry type defining the features.
    HYPACKLine
    Trackline name assigned by HYPACK-A Xylem Brand acquisition software version 16.1.1.0 with the subFAN 16BIM04_L as the prefix. For example 16BIM04_L001, 16BIM04 denotes the USGS subFAN number, L denotes line, 001 denotes the line number. If a survey line had to be split into segments, the example would be 16BIM04_L001_f1 where f1, f2, f# equals the segment. If a survey line was considered a crossing the example would be 16BIM04_crossing. (Source: HYPACK)
    Range of values
    Minimum:16BIM04_L001
    Maximum:16BIM14_L186
    Year
    The year the data were collected (Source: USGS) 2016
    Lenth_m
    Length of survey line, in meters (Source: Esri)
    Range of values
    Minimum:19.79
    Maximum:15,882.53
    Units:meters
    Resolution:0.01

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Nancy T. DeWitt
    • Chelsea A. Stalk
    • Jake J. Fredericks
    • James G. Flocks
    • Kyle W. Kelso
    • Andrew S. Farmer
    • Thomas M. Tuten
    • Noreen A. Buster
  2. Who also contributed to the data set?
    U.S. Geological Survey, Coastal and Marine Geology Program, St. Petersburg Coastal and Marine Science Center
  3. To whom should users address questions about the data?
    Jake Fredericks
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Physical Scientist/Hydrographic Tech
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8033 (voice)
    jfredericks@usgs.gov

Why was the data set created?

This zip archive contains trackline shapefiles or processed x,y,z point data for the IFB collected in July 2016 (FAN = 2016-347-FA; subFAN = 16BIM04) nearshore from West Ship Island to Horn Island, GUIS, Mississippi. The processed interferometric soundings are provided in comma delimited American Standard Code for Information Interchange (ASCII) format.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2016 (process 1 of 4)
    Swath Bathymetry Acquisition: The interferometric swath bathymetry data were collected aboard the R/V Sallenger in July 2016, using the SEA SWATHplus-H 468 kHz interferometric sonar system. The transducer system was fastened to a static pole mount deployed over the starboard side gunnel. The Novatel GPS antennas were mounted atop the cabin. Boat position and motion data were recorded in real-time using a Coda Octopus F190R+ wetpod IMU. The IMU was mounted underwater between the transducer heads to minimize lever arm geometry errors between observed depths and vessel motion. Real-time corrected positions were acquired via Marinestar HP DGPS subscription service from Fugro, Inc. Marinestar HP position correction data and motion data from the IMU were integrated with interferometric soundings using Bathyswath software, version 3.10.2.0, with positional and calibration offsets pre-defined by a session file (.sxs), allowing for real-time-corrected depths. Before deployment, all equipment offsets were measured. During the survey, all swath tracklines were recorded in Bathyswath raw data format (.sxr). A Valeport Mini Sound Velocity Sensor (miniSVS) was attached to the transducer mount and collected continuous speed of sound (SOS) measurements at the depth of the transducers. These values were directly read and incorporated into the Bathyswath raw data format during acquisition, providing a real-time speed of sound at the transducer while underway. In addition, a separate YSI Castaway Conductivity, Temperature, and Depth (CTD) probe was used to collect speed of sound profiles (water surface to seafloor) throughout the survey. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Jake Fredericks
    Physical Scientist/Hydrographic Tech
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8033 (voice)
    jfredericks@usgs.gov
    Data sources produced in this process:
    • raw data files including: Bathyswath specific (*.sxs, *.sxr), F190R+ specific (*.csv, *.mcom), and Castaway CTD (*.ctd, *.svp, *.csv)
    Date: 2016 (process 2 of 4)
    Swath Bathymetry Processing: Data were collected with Bathyswath 3.10.2, an acquisition and initial processing program. Preliminary roll calibration trackline data were collected and processed using Bathyswath Swath Processor version 3.10.2.0 and Bathyswath Grid Processor software version 3.10.0.0. Instrument offsets and calibration values were input into the session file (.sxs) and the raw data files (.sxr) were then processed using the updated system configuration file containing roll calibration values, measured equipment offsets, acquisition parameters, navigation and motion from the F190R+, SOS at the sonar head, and SVP cast data. Any calibration offsets and acoustic filtering utilized in Bathyswath was then applied to each raw data file to create a processed data file (.sxp), and then imported into advanced sounding data processing software CARIS HIPS and SIPS (CARIS) version 9.1. The initial real-time processing datum for the swath and backscatter data was WGS84(G1762), which is the acquisition datum for Marinestar HP position and navigation data.
    Within CARIS, outliers for the navigation data and processed soundings were removed using program filters. Any remaining data outliers were then removed manually. A CARIS BASE surface with associated CUBE sample surface was created from the edited soundings. A CUBE hypothesis is the estimated value of a grid node representing all the soundings within a chosen resolution or grid-cell size (for example, 5 m) weighted by uncertainty and proximity, giving the final value as a "sample" of the data within the specific grid cell. This algorithm allows for multiple grid-node hypotheses to be verified or overridden by the user while maximizing processing efficiency. A final visual inspection of the dataset in addition to Quality Control and Quality Assurance (QA/QC) procedures were implemented to ensure all outliers and erroneous data points had been removed from the final BASE surface. In order to provide the dataset in a non-proprietary format, the final x,y,z data were exported as an ASCII comma-separated file. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Jake Fredericks
    Physical Scientist/Hydrographic Technician
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8033 (voice)
    jfredericks@usgs.gov
    Data sources used in this process:
    • raw data files including: Bathyswath specific (*.sxs, *.sxr), F190R+ specific (*.csv, *.mcom), and Castaway CTD (*.ctd, *.svp, *.csv)
    Data sources produced in this process:
    • 16BIM04_IFB_ITRF08_5m_xyz.txt
    Date: 2016 (process 3 of 4)
    Trackline file export: The interferometric swath trackline file was produced by creating an HOB file in CARIS version 10.2.1, which could then be exported as a shapefile. This shapefile was then imported into Arcmap version 10.4.1 and additional attributes were added for the data release. The resultant polyline shapefile was then projected in ITRF00 and NAD83, respectively. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Nancy T. DeWitt
    Geologist
    600 4th Street South
    St. Petersburg, FL
    U.S.

    (727) 502-8000 (voice)
    ndewitt@usgs.gov
    Data sources used in this process:
    • 16BIM04_Tracklines.hob 16BIM04_IFB_ITRF00_Level_004_tracklines.shp
    Data sources produced in this process:
    • Ship_Horn_Island_2016_IFB_ITRF00_tracklines.zip Ship_Horn_Island_2016_IFB_NAD83_tracklines.zip
    Date: 2016 (process 4 of 4)
    VDATUM Conversion: Using the National Oceanic and Atmospheric Administration (NOAA) VDatum version 3.6 transformation software (http://vdatum.noaa.gov/) the IFB dataset was transformed from ITRF08 to ITRF00 to match the SBB dataset. The dataset was then transformed from ITRF00 to NAD83 and NAVD88 with respect to the GEOID12B model and finally into NAD83 and MLLW, for inclusion in this data release. The datasets were renamed for this data release. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Nancy T. DeWitt
    Geologist
    600 4th Street South
    St. Petersburg, FL
    U.S.

    (727) 502-8058 (voice)
    ndewitt@usgs.gov
    Data sources used in this process:
    • 16IM04_IFB_ITRF08_5m_xyz.txt
    Data sources produced in this process:
    • Ship_Horn_Island_2016_IFB_ITRF00_5m_xyz.txt Ship_Horn_Island_2016_IFB_NAD83_MLLW_5m_xyz.txt Ship_Horn_Island_2016_IFB_NAD83_NAVD88_GEOID12B_5m_xyz.txt
  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?
    The accuracy of the data was determined during data collection. This dataset was from one research cruise and was therefore internally consistent. Methods were employed to maintain data collection consistency aboard the platform. During mobilization, each piece of equipment was isolated to obtain internal and external offset measurements with respect to the survey platform. All the critical measurements were recorded manually and digitally entered into their respective programs. For the interferometric swath bathymetry, offsets between the sonar head and the Differential Global Positioning System (DGPS) antennas were measured and entered into the Coda Octopus F190R+ internal setup program. The DGPS correction was obtained from Marinestar High-precision (HP) differential global navigation satellite system, a satellite positioning service, from Fugro, Incorporated (Inc.). This signal was received through the Coda Octopus F190R+ GPS antennas. These bathymetric data have not been independently verified for accuracy. The dataset was collected in the native format of WGS84 (G1762), which is equivalent to ITRF08.
  2. How accurate are the geographic locations?
    Navigation information was recorded in real-time kinematic mode via the Coda Octopus F190R+ Precision Attitude and Positioning System. Differential GPS correction was obtained through the Marinestar HP broadcast subscription from Fugro, Inc. The manufacturer's stated horizontal accuracy is 10 centimeters (cm) 95% of the time. The trackline position data were recorded using HYPACK version 16.1.1.0 hydrographic acquisition and processing software.
  3. How accurate are the heights or depths?
    The manufacturer's stated vertical accuracy of Marinestar GPS subscription is 15 cm, 95% of the time. The Coda Octopus F190R+ inertial measurement unit (IMU), which integrates the Marinestar position with motion, measures vessel velocity (+/- 0.014 meters/second [m/s]), roll and pitch (less than 0.025 degrees), heading (1 m baseline 0.1 degrees), and heave (5 cm per m of depth). The vertical accuracy for the SWATHplus-H system varies with depth and across track range. Vertical transformation error reported by VDatum version 3.6 is the following: Transformation from ITRF08 to ITRF00 (equivalent to WGS84 [G1150]) is 0.00 m or 0.00 cm for the vertical area named conus (Continental U.S.). Transformation from ITRF00 to NAD83, NAVD88 with respect to GEOID12B is 0.0762 m or 7.62 cm for the vertical area named GEOID12B. Transformation from NAD83, NAVD88 with respect to GEOID12B to NAD83, MLLW is 0.163 m or 16.30 cm for the vertical area named LAmobile02-8301.
  4. Where are the gaps in the data? What is missing?
    These are complete, post-processed xyz bathymetric data points from interferometric swath data collected in July 2016 from the nearshore areas of Ship and Horn Islands, Mississippi.
  5. How consistent are the relationships among the observations, including topology?
    This file includes the post-processed bathymetric data (x,y,z) collected during an interferometric swath bathymetry survey (2016-347-FA, subFAN 16BIM04) acquired from nearshore waters surrounding Ship Island and Horn Island, Mississippi. Refer to the supplemental information section of the data release for field logs, vessel platform descriptions, and other survey information.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints:
The U.S. Geological Survey requests that it be referenced as the originator of this dataset in any future products or research derived from these data.
Use_Constraints: These data should not be used for navigational purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    Nancy T. DeWitt
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8058 (voice)
    ndewitt@usgs.gov
  2. What's the catalog number I need to order this data set? Ship_Horn_Island_2016_IFB_ITRF00_5m_xyz.txt, Ship_Horn_Island_2016_IFB_NAD83_NAVD88_GEOID12B_xyz.txt, Ship_Horn_Island_2016_IFB_NAD83_MLLW_xyz.txt, Ship_Horn_Island_2016_IFB_ITRF00_tracklines.txt, Ship_Horn_Island_2016_IFB_NAD83_tracklines.txt
  3. What legal disclaimers am I supposed to read?
    This publication was prepared by an agency of the United States Government. Although these data were processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    The ASCII text files contained in the .zip archives can be accessed with any standard text file reader.

Who wrote the metadata?

Dates:
Last modified: 18-Mar-2019
Metadata author:
Nancy T. DeWitt
U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
Geologist
600 4th Street South
St. Petersburg, FL
USA

(727) 502-8058 (voice)
ndewitt@usgs.gov
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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