5-meter swath bathymetric grid collected by Alpine Ocean Seismic Survey, Inc., offshore of The Rockaways to Jones Inlet, NY in 2014, as part of a collaborative U.S. Army Corp of Engineers and U.S. Geological Survey mapping effort (UTM zone 18N, WGS 84, Esri binary grid file format)

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Frequently anticipated questions:


What does this data set describe?

Title:
5-meter swath bathymetric grid collected by Alpine Ocean Seismic Survey, Inc., offshore of The Rockaways to Jones Inlet, NY in 2014, as part of a collaborative U.S. Army Corp of Engineers and U.S. Geological Survey mapping effort (UTM zone 18N, WGS 84, Esri binary grid file format)
Abstract:
Hurricane Sandy, the largest storm of historical record in the Atlantic basin, severely impacted southern Long Island, New York in October 2012. In 2014, the U.S. Geological Survey (USGS), in cooperation with the U.S. Army Corps of Engineers (USACE), conducted a high-resolution multibeam echosounder survey with Alpine Ocean Seismic Survey, Inc., offshore of Fire Island and western Long Island, New York to document the post-storm conditions of the inner continental shelf. The objectives of the survey were to determine the impact of Hurricane Sandy on the inner continental shelf morphology and modern sediment distribution, and provide additional geospatial data for sediment transport studies and coastal change model development. For more information about the WHCMSC Field Activity, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2014-072-FA.
  1. How might this data set be cited?
    U.S. Geological Survey, 2015, 5-meter swath bathymetric grid collected by Alpine Ocean Seismic Survey, Inc., offshore of The Rockaways to Jones Inlet, NY in 2014, as part of a collaborative U.S. Army Corp of Engineers and U.S. Geological Survey mapping effort (UTM zone 18N, WGS 84, Esri binary grid file format): data release DOI:10.5066/F7C827BX, 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.

    Denny, J.F., Danforth, W.W., Couch, S., and Schwab, W.C., 2015, Swath bathymetry collected offshore of Fire Island and western Long Island, New York in 2014, U.S. Geological Field Activity 2014-072-FA: data release DOI:10.5066/F7C827BX, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -73.864295
    East_Bounding_Coordinate: -73.568685
    North_Bounding_Coordinate: 40.586682
    South_Bounding_Coordinate: 40.518519
  3. What does it look like?
    https://cmgds.marine.usgs.gov/data/field-activity-data/2014-072-FA/data/bathymetry/NYB_MB5m_2014.jpg (JPG)
    Depth-colored image of bathymetry on the inner continental shelf offshore of The Rockaways to Jones Inlet, NY
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 11-Jan-2014
    Ending_Date: 25-Feb-2014
    Currentness_Reference:
    ground condition during 20140111, 20140114, 20140118, 20140120 - 20140114, 20140130 - 20140201, 20140225
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: raster digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 1441 x 4986 x 1, type Grid Cell
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 18
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -75.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 5.000000
      Ordinates (y-coordinates) are specified to the nearest 5.000000
      Planar coordinates are specified in meters
      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.
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: NAVD88
      Depth_Resolution: 0.1
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    Value
    Depth in meters relative to NAVD88 (Source: Esri)
    Entity_and_Attribute_Overview:
    Swath bathymetry in Esri ArcRaster format. Data values represent depth in meters referenced to North American Vertical Datum of 1988 (NAVD88).
    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?
  3. To whom should users address questions about the data?
    Jane F. Denny
    U. S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, Massachusetts
    USA

    508-548-8700 x2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov

Why was the data set created?

This bathymetric grid represents approximately 1170 kilometers of bathymetric data collected in 2014. These data were collected using a dual-head R2Sonic 2024 multibeam echosounder (MBES) by Alpine Ocean Seismic Survey, Inc., during USGS field activity 2014-072-FA. These bathymetric data were used to determine the impact of Hurricane Sandy on the inner continental shelf morphology and sediment distribution.

How was the data set created?

  1. From what previous works were the data drawn?
    Raw Bathymetric Data (source 1 of 1)
    U.S. Geological Survey, Unpublished Material, Raw Bathymetric Data.

    Type_of_Source_Media: disc
    Source_Contribution:
    The specific details of the survey operation and system preparation and calibration are listed in: 1714_USGS_SOP.pdf stored in https://cmgds.marine.usgs.gov/data/field-activity-data/2014-072-FA/data/logs/2014-072-FA_Alpine_logs.zip. A summary of the operation and systems used is given below. The multibeam echosounder (MBES) survey was conducted aboard the R/V Shearwater, a 110 aluminum tri-maran research vessel owned and operated by Alpine Ocean Seismic Survey, Inc. The R2Sonic 2024 dual-head MBES was mounted in the port side moon pool. The Applanix PosMV 320 MRU was mounted on the top moon pool plate and was used for positioning and attitude. Two GPS antennas were installed on a custom designed support system on the second deck. An AML Minos-X SVP was used to acquire sound velocity profiles during survey operations and a Valeport mini SVS was used to acquire speed of sound measurements at the R2Sonic 2024 transducer face. Survey lines were spaced at 100-m in order to image 100% of the seafloor within the survey areas. The survey areas were focused offshore of Fire Island, and offshore of the Rockaways and Long Beach, NY. (The survey areas were: 1) Rockaways and Long Beach (NYB = NY Block); 2) Fire Island to Watch Hill up to 5 km offshore (FI = Fire Island) , Watch Hill to Moriches Inlet, up to 8 km offshore (OWH = Optional Watch Hill) and Fire Island to Watch Inlet, extended from 5 km to 8 km offshore (OFI = Optional Fire Island). All survey areas were completely mapped during 2014-072-FA).
  2. How were the data generated, processed, and modified?
    Date: 2015 (process 1 of 5)
    Alpine Ocean Seismic Survey, Inc. processing routines and flow are described in detailed in 1714MBEProcessing_HOWTO.docx, stored in https://cmgds.marine.usgs.gov/data/field-activity-data/2014-072-FA/data/logs/2014-072-FA_Alpine_logs.zip. An overview is presented below: R2Sonic 2024 Multibeam Echosounder (MBES) data were acquired using QPS (Quality Positioning Services) QINSy (Quality Integrated Navigation System; version 8.10.2013.10.10.1) hydrographic data acquisition software. Raw XTF multibeam echo sounder data, attribute and navigation data were imported in CARIS 8.1.4 for data processing. GPS Tides (RTK navigation) was computed within CARIS 8.1.4. Sound velocity profiles were used to account for changes in the speed of sound within the water column during the survey. The multibeam echosounder data were then cleaned using the swath and subset editors to remove spurious points. Refraction artifacts were present in the data and were resolved using the Refraction Editor within CARIS. Additional filters were applied to the data to eliminate noise in the outer beams. A final 5 meter bathymetric grid was computed. An interpolation matrix (5 x 5 and neighbors of 6) was used to fill small gaps in the bathymetric grid. The final grid was exported to an xyz ASCII file using Base Surface to ASCII. The ASCII file was then imported to ArcGIS (version unspecified) using the ASCII to Feature Class tool, converted to a raster using the Point to Raster Tool, and then converted back to an ASCII Raster using the Raster to ASCII Tool. Person who carried out this activity:
    Jane F. Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov
    Date: 2015 (process 2 of 5)
    The depth values within the bathymetric grid were converted from positive values to negative values using the Raster Calculator in ArcGIS 9.3. The input grid was multiplied by a value of -1 and a new output grid was generated with negative depth values. Person who carried out this activity:
    Jane F. Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 X2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov
    Date: 19-Apr-2017 (process 3 of 5)
    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 4 of 5)
    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 5 of 5)
    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?
    Schwab, William C., Baldwin, Wayne E., Hapke, Cheryl J., Lentz, Erika E., Gayes, Paul T., Denny, Jane F., List, Jeffrey H., and Warner, John C., 2013, Geologic Evidence for Onshore Sediment Transport from the Inner Continental Shelf: Fire Island, New York: Journal of Coastal Research Volume 29, Issue 3, pp. 526-544., Coastal Education and Research Foundation, Inc., Florida, USA.

    Online Links:

    Foster, David S., Swift, Ann B., and Schwab, William C., 1999, Stratigraphic Framework Maps of the nearshore area of southern Long Island from Fire Island to Montauk Point, NY: Open-File Report 99-559, U.S. Geological Survey, Reston, VA.

    Online Links:

    Schwab, William C., Thieler, E. Robert, Denny, Jane F., Danforth, William W., and Hill, Jenna C., 2000, Seafloor sediment distribution off southern Long Island, New York: Open-File Report 00-243, U.S. Geological Survey, Reston, VA.

    Online Links:

    Schwab, W.C., Denny, J.F., and Baldwin, W.E., 2014, Maps Showing Bathymetry and Modern Sediment Thickness on the Inner Continental Shelf Offshore of Fire Island, New York, Pre-Hurricane Sandy: Open File Report 2014-1203, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    This publication contains the backscatter image generated from data collected during WHCMSC field activity 2011-005-FA.
    Schwab, W.C., Baldwin, W.E., and Denny, J.F., 2014, Maps Showing the Change in Modern Sediment Thickness on the Inner Continental Shelf Offshore of Fire Island, New York, Between 1996-97 and 2011: Open File Report 2014-1238, U.S. Geological Survey, Reston, VA.

    Online Links:

    Schwab, William C., Baldwin, Wayne E., Denny, Jane F., Hapke, Cheryl J., Gayes, Paul T., List, Jeffrey H., and Warner, John C., 2014, Modification of the Quaternary stratigraphic framework of the inner-continental shelf by Holocene marine transgression: An example offshore of Fire Island, New York: Marine Geology Volume 355, Elsevier B.V., Amsterdam, Netherlands.

    Online Links:

    Goff, J.A., Flood, R.D., Austin, J.A., Schwab, W.C., Christensen, B., Browne, C.M., Denny, J.F., and Baldwin, W.E., 2015, The impact of Hurricane Sandy on the shoreface and inner shelf of Fire Island, New York: Large bedform migration and limited erosion: Continental Shelf Research v. 98, pp. 13-25, Elsevier B.V., Amsterdam, Netherlands.

    Online Links:


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 and attitude (heave, pitch, roll and yaw) were acquired with an Applanix PosMV 320 Motion Reference Unit (MRU) using Differential Global Positioning System (DGPS), which is accurate to + or - 1 to 2 meters, horizontally. The configuration of the primary and secondary GPS antennas used for positioning and attitude aboard the R/V Shearwater are outlined in '1716Offset_Form.pdf', stored in https://cmgds.marine.usgs.gov/data/field-activity-data/2014-072-FA/data/logs/2014-072-FA_Alpine_logs.zip.
  3. How accurate are the heights or depths?
    Vertical accuracy of the raw data based on system specifications may approximate 1% of water depth, approximately 0.1 to 0.3 meters within the survey area. The Applanix PosMV 320 MRU used to correct ship motion (heave, pitch, roll and yaw) has a theoretical vertical accuracy of a few mm. Real Time Kinematic (RTK) GPS height corrections were post processed and used to reference soundings to the North American Vertical Datum of 1988 (NAVD88) and remove water depth variations caused by tides. Refraction artifacts were minimized by acquiring sound velocity profiles throughout the survey area using an AML Minos-X SVP. (See: 1724_USGS_SOP.pdf stored in https://cmgds.marine.usgs.gov/data/field-activity-data/2014-072-FA/data/logs/2014-072-FA_Alpine_logs.zip).
  4. Where are the gaps in the data? What is missing?
    All collected survey line data were incorporated into the final bathymetric grid.
  5. How consistent are the relationships among the observations, including topology?
    This file represents gridded bathymetric data; an interpolation matrix (5 x 5 pixels and 6 neighbors) was used to remove holidays in the data. (See https://cmgds.marine.usgs.gov/data/field-activity-data/2014-072-FA/data/logs/2014-072-FA_Alpine_logs.zip).

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:
These data are NOT to be used for navigation. Mariners should refer to the appropriate nautical chart. 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)
    Jane F. Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, Massachusetts
    USA

    508-548-8700 x2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable Data
  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. Is there some other way to get the data?
    none
  6. What hardware or software do I need in order to use the data set?
    These data are available as an ArcInfo 32-bit floating point binary grid in Esri format. The floating point binary grid and associated 'info' folder are stored in one folder 'bathy' that has been compressed using WinZip (ver.14.0) software. To utilize these data, the user must have software capable of uncompressing the zip file and importing and viewing an Esri ArcRaster grid. The zip file also contains associated metadata.

Who wrote the metadata?

Dates:
Last modified: 08-Sep-2020
Metadata author:
Jane F. Denny
U.S. Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, Massachusetts
USA

508-548-8700 x2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
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_072_fa/nyb_mb5m_2014.faq.html>
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