5 meter ArcRaster grid of multibeam bathymetry of the offshore area of Cape Ann - Salisbury Beach Massachusetts Survey Area (BATH_OS5m, UTM Zone 19, WGS84)

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Frequently anticipated questions:

What does this data set describe?

Title:
5 meter ArcRaster grid of multibeam bathymetry of the offshore area of Cape Ann - Salisbury Beach Massachusetts Survey Area (BATH_OS5m, UTM Zone 19, WGS84)
Abstract:
These data were collected under a cooperative agreement with the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center. Initiated in 2003, the primary objective of this program is to develop regional geologic framework information for the management of coastal and marine resources. Accurate data and maps of sea-floor geology are important first steps toward protecting fish habitat, delineating marine reserves, and assessing environmental changes due to natural or human impacts. The project is focused on the inshore waters (5-30m deep) of Massachusetts between the New Hampshire border and Cape Cod Bay. Data collected for the mapping cooperative have been released in a series of USGS Open-File Reports<http://woodshole.er.usgs.gov/project-pages/coastal_mass/html/current_map.html>. This spatial dataset is from the Cape Ann and Salisbury Beach Massachusetts project area. They were collected in two separate surveys in 2004 and 2005 and cover approximately 325 square kilometers of the inner continental shelf. High resolution bathymetry and backscatter intensity were collected in 2004 and 2005. Seismic profile data, sediment samples and bottom photography were also collected in 2005.
  1. How might this data set be cited?
    U.S. Geological Survey, 2008, 5 meter ArcRaster grid of multibeam bathymetry of the offshore area of Cape Ann - Salisbury Beach Massachusetts Survey Area (BATH_OS5m, UTM Zone 19, WGS84): Open-File Report 2007-1373, 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.

    Barnhardt, Walter A., Andrews, Brian D., Ackerman, Seth D., Baldwin, Wayne E., and Hein, Christopher J., 2008, High-Resolution Geological Mapping of the Inner Continental Shelf: Cape Ann to Salisbury Beach, Massachusetts.: Open-File Report 2007-1373, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -70.823419
    East_Bounding_Coordinate: -70.544192
    North_Bounding_Coordinate: 42.900113
    South_Bounding_Coordinate: 42.666644
  3. What does it look like?
    http://pubs.usgs.gov/of/2007/1373/GIS/browse_jpg/bath_os5m.jpg (JPEG)
    black and white thumbnail image of bathymetry
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 23-Feb-2004
    Ending_Date: 16-Mar-2004
    Currentness_Reference:
    ground condition
  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 5097 x 4467 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: 19
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -69.000000
      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 5.001120
      Ordinates (y-coordinates) are specified to the nearest 5.001120
      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: mean lower low water
      Depth_Resolution: 0.1
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    Value
    Depth in meters below mean lower low water (Source: ESRI)
    Information unavailable from original metadata.
    Information unavailable from original metadata. (Source: Information unavailable from original metadata.)
    Range of values
    Minimum:-7.88
    Maximum:-91.41
    Units:meters
    Entity_and_Attribute_Overview:
    Multibeam bathymetry in ESRI ArcRaster form. Data values represent depth in meters referenced to mean lower low water (MLLW).
    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?
    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2348 (voice)
    508-457-2310 (FAX)
    bandrews@usgs.gov

Why was the data set created?

The purpose of these data is to establish high-resolution acoustic depth measurements of the seafloor for regional geologic framework investigations. These data cover 257 square kilometers of the offshore survey area between Cape Ann and Salisbury Beach, Massachusetts, in depths between 7 m and 91m. The data were collected by Science Applications International Corporation (SAIC), in 2004 for the USGS, under contract to the University of New Hampshire.

How was the data set created?

  1. From what previous works were the data drawn?
    SAIC data (source 1 of 1)
    SAIC, unpublished material, Original data acquisition.

    Other_Citation_Details:
    The source citation information is inferred from other information in the metadata and was not part of the original metadata file. Source time period of content was inferred from the time period of the dataset.
    Type_of_Source_Media: Information unavailable from original metadata.
    Source_Contribution:
    System Setup and Operation. The offshore bathymetric data were collected in 2004 using a hull-mounted RESON 8101 multibeam echo sounder operating at a frequency of 240 kHz. A cutoff angle of 57 degrees (114 degrees total swath width) was used for data collection. A TSS POS/MV Model 329 Position and Orientation System was used as the vessel's motion sensor. Sound velocity casts were taken every 2-4 hours with a Brooke Ocean Technology MVP 30 System and Applied Microsystems Smart Sound Velocity Sensor. The SAIC ISS2000 Integrated Survey System Software was used to monitor real-time data during the survey. A Trimble 4000 DGPS receiver was used for all navigation (SAIC, 2004). A patch test was conducted at the beginning of the survey in order to measure roll angle offsets. Roll angle offsets can have a strong effect on the accuracy of depth measurements. The roll angle offset is the difference between the motion sensor vertical measurement and the nominal mount angle of the transducers. The calculated roll angle offsets were stored within the SABER acquisition software.
  2. How were the data generated, processed, and modified?
    Date: Mar-2004 (process 1 of 8)
    The majority of the multibeam data were initially edited onboard the survey vessel, using SAIC's Multi View Editor (MVE) program. This tool is a geo-referenced editor, which allows for both plan and profile views with each beam in its true geographic position and depth. Each data file was edited to remove noise, fish, etc. At the end of each leg, both the raw and processed data were backed up onto 4mm tapes and shipped to the Data Processing Center in Newport, RI. Once the data were in Newport and had been extracted to local machines, track lines were created by extracting the sounder position from the multibeam data. The tracks were reviewed to confirm that no errors in navigation existed and that the tracks extended to the outermost bounds of the survey area. After the application of preliminary tides and interpolated draft, multibeam binned-depth grids were generated. A 5-meter Pure File Magic (PFM) grid was generated and edited in area based mode using MVE. The 5-meter projected PFM allowed multiple line editing which enhances visualization and proves efficient in the MVE process to ensure data quality. If any anomalies were found in the sounding bins, the edited multibeam files were re-examined and re-edited as necessary. When all multibeam files were determined to be satisfactory, the data were binned to a 5-meter and 2-meter cell size, populating the bin with the average of all soundings in the bin and maintaining the position of the center of the bin. Person who carried out this activity:
    Science Applications International Corporation (SAIC)
    221 Third St.
    Newport, RI
    USA

    401-847-4210 (voice)
    401-849-1585 (FAX)
    Date: 30-Apr-2004 (process 2 of 8)
    Processed and edited multibeam line files were delivered to USGS by SAIC on 300 Gb external hard drive. SAIC delivered both the raw line files in GSF format, the processed line files in eXtended Triton Format (XTF) and the final grids in ASCII Raster format. Person who carried out this activity:
    Bradford Butman
    U.S. Geological Survey
    Oceanographer
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2212 (voice)
    505-457-2310 (FAX)
    bbutman@usgs.gov
    Date: Sep-2007 (process 3 of 8)
    USGS Grid Generation: The ASCII Raster file delivered by SAIC was produced with all survey lines including the main scheme, gap fill, and cross lines used for junction analysis. These cross lines are oriented at right angles to the main scheme (north-south) survey lines and extended shoreward into the nearshore survey area. These cross lines were not required for the final bathymetric grid. A new CARIS HIPS project (ver 6.1) was created with the projection information set to Universal Transverse Mercator (UTM) Zone 19, WGS84. The Processed GSF files for all main scheme lines were imported to CARIS using the import/conversion wizard A 5 meter Bathymetry and Statistical Error (BASE) surface was built from the line files. All previous edit flags were imported and no further editing was done in CARIS. Person who carried out this activity:
    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd
    Woods Hole, MA
    USA

    508-548-8700 x2348 (voice)
    508-457-2310 (FAX)
    bandrews@usgs.gov
    Date: Nov-2007 (process 4 of 8)
    CARIS to ESRI Conversion: The CARIS HIPS BASE surface was converted to an ArcGIS 32-bit floating point raster grid in a three step process. First, the CARIS BASE surface was imported to Interactive Visualizations Systems (IVS) Data Magician (DMagic ver. 6.5.1) .dtm and .geo format. Second, the DMagic file was exported to an ASCII Raster format with ESRI header. Finally the third step imported the ASCII raster file into an ArcGIS 32-bit floating point raster grid (bath_os5m) using the ArcToolbox (ArcGIS ver. 9.2) Conversion Tools-"ASCII to Raster Tool". Person who carried out this activity:
    Brian Andrews
    U.S. Geological Survey
    Geographer
    384 Woods Hole Rd
    Woods Hole, MA
    USA

    508-548-8700 x2348 (voice)
    508-457-2310 (FAX)
    bandrews@usgs.gov
    Date: 05-Nov-2015 (process 5 of 8)
    Edits to the metadata were made to fix any errors that MP v 2.9.30 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. file had a source contribution, but no source citation information. This information was populated based on information in the source contribution. The distribution format was edited to AIG, based on information contained in the last original process step. AIG indicates Arc/Info Binary Grid. Other minor edits were probably performed (title, publisher, publication place, etc.). The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 20-Jul-2018 (process 6 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: 18-Nov-2019 (process 7 of 8)
    Crossref DOI link was added as the first link in the metadata. 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?
    Barnhardt, Walter A., Andrews, Brian D., and Butman, Bradford, 2006, High-Resolution Mapping of the Inner Continental Shelf: Nahant to Gloucester, Massachusetts: Open-File Report 2005-1293, U.S. Geological Survey, Reston, VA.

    Online Links:

    Ackerman, Seth D., Butman, Bradford, Barnhardt, Walter A., Danforth, William W., and Crocker, James M., 2006, High-Resolution Geologic Mapping of the Inner Continental Shelf: Boston Harbor and Approaches, Massachusetts: Open-File Report 2006-1008, U.S. Geological Survey, Reston, VA.

    Online Links:

    Science Applications International Corporation (SAIC), 20040430, Southern Merrimack Embayment Multibeam Survey, Survey Report: SAIC, Newport, Rhode Island.

    Online Links:

    Other_Citation_Details: Survey Report

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?
    These data were navigated using data from U.S. Coast Guard Differential Global Positioning System (DGPS) network.
  3. How accurate are the heights or depths?
    Vertical accuracy of <= to 0.5 meters for 95.8 percent of the soundings in water depths between 7-91 meters. These data were quantitatively compared by cross line junction analysis. 95.8 percent of the comparisons were within 50 cm (vertical) of each other. Ship motion (heave, pitch, yaw, roll) was recorded with a TSS POS/MV 320 Position and Orientation System. The NOAA tide station in Portland, ME 8418150 was the source of preliminary water level heights for Cape Ann to Salisbury Beach offshore survey area. Preliminary tide data for this station were downloaded from the NOAA CO-OPS web page http://www.co-ops.nos.noaa.gov/ hydro.html). All tide data were annotated with Coordinated Universal Time (UTC). The zoning parameters SAIC created were: On Portland, ME (8418150) + 8 minutes ratio 0.964 On Boston Light, MA (8444162) +2 minutes ratio 0.972 All bathymetry data collected during the survey were corrected for water level variations using water level files. Water level files for each tide zone were created from downloaded preliminary NOAA tide data using the Survey Analysis and area Based Editor (SABER) Create Water Level Files tool. Water level files contain water level heights that are subtracted algebraically from depths to correct the sounding for tide and water level. These water level files were applied to the multibeam data using the Apply Tides tool within the SABER software. Comparison of the zoned 6-minute water level heights computed from Boston Light, MA (8444162) to those computed from Portland, ME (8418150) shows an average height difference of 0.009 meters and a standard deviation of 0.042 meters. The maximum and minimum differences were +0.125 meters and -0.078 meters. Because the Portland, ME (8418150) gauge is a NOAA Primary Control Tide Station water level zoned heights from that station were used to correct the soundings. Sound velocity casts were taken every 2-4 hours with a Brooke Ocean Technology MVP 30 System and Applied Microsystems Smart Sound Velocity Sensor.
  4. Where are the gaps in the data? What is missing?
    Survey lines run for cross line junction analysis are not included in this grid.
  5. How consistent are the relationships among the observations, including topology?
    Information unavailable from original metadata.

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:
The intended scale of these data is 1:25,000 Data are not intended for navigational use. 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)
    Brian Andrews
    U.S. Geological Survey, Woods Hole Science Center
    Geographer
    384 Woods Hole Rd.
    Woods Hole, MA
    USA

    508-548-8700 x2348 (voice)
    bandrews@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?
    • Availability in digital form:
      Data format: Grid containing high-resolution bathymetric data collected in the offshore survey area of the Cape Ann to Salisbury Beach Survey Area. in format AIG (version ArcGIS 9.2) ESRI Raster GRID format Size: 89.887
      Network links: http://pubs.usgs.gov/of/2007/1373/GIS/raster/bathymetry/bath_os5m.zip
      Media you can order: DVD-ROM (Density 4.75 Gbytes) (format UDF)
      Note: None
    • Cost to order the data: None

  5. What hardware or software do I need in order to use the data set?
    These data are available as a ArcInfo 32-bit floating point binary grid in Environmental Systems Research Institute (ESRI) format. The grid consists of two folders, one with the "grid name", and one "info" folder. The two folders for each grid are compressed into one file using WinZip (ver. 9.0) software. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing an ESRI ArcRaster grid. The two folders for each grid must be uncompressed to the same folder. If during the process of extracting multiple grids in WinZip format to the same folder, the user is prompted by WinZip software to "overwrite existing files" in the info folder select the "yes" option.

Who wrote the metadata?

Dates:
Last modified: 08-Sep-2020
Metadata author:
Brian Andrews
U.S. Geological Survey
Geographer
384 Woods Hole Rd.
Woods Hole, MA
USA

508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@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/open_file_report/ofr2007-1373/bath_os5m.grd.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:20:23 2021