U.S. Geological Survey, 2010, DH_bathyhlshd_wgaps: Depth-colored hillshade image of bathymetry data collected by the U.S. Geological Survey and the National Oceanic and Atmospheric Administration offshore of Massachusetts between Duxbury and Hull with data gaps (Depth-colored Hillshade GeoTIFF): Open-File Report 2009-1072, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, Massachusetts.This is part of the following larger work.Online Links:
- <https://pubs.usgs.gov/of/2009/1072/GIS/raster/bathy/DH_bathyhlshd_wgaps.zip>
- <https://pubs.usgs.gov/of/2009/1072/html/appendix1.html>
Barnhardt, Walter A. , Ackerman, Seth D. , Andrews, Brian D. , and Baldwin, Wayne E. , 2010, Geophysical and Sampling Data from the Inner Continental Shelf: Duxbury to Hull, Massachusetts.: Open-File Report 2009-1072, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, Massachusetts.Online Links:
This is a Raster data set. It contains the following raster data types:
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.
This GeoTIFF image shows approximately 200 square kilometer of bathymetric data that were collected in 2003, 2006 and 2007. This image was created from merged grids of interferometric (Systems Engineering and Assessment Ltd. SWATHPlus-M) and multibeam (RESON SeaBat 8101 and 8125) bathymetric sonar data that were collected by the U.S. Geological Survey and the National Oceanic and Atmospheric Administration, respectively, during three surveys (NOAA survey H10993 and USGS surveys 06012 and 07001) offshore of Massachusetts, between Duxbury and Hull. These data are used to define the sea-floor morphology as part of the Massachusetts Sea-floor Mapping Project. This image shows the extent of data collected along each swath with no interpolation, therefore it demonstrates the data gaps where adjacent swaths did not meet and where gaps exist because the bathymetric data along a particular track were deemed usable in the final grid.
U.S. Geological Survey.
Person who carried out this activity:
508-548-8700 x2315 (voice)
508-457-2310 (FAX)
sackerman@usgs.gov
Person who carried out this activity:
508-548-8700 x2315 (voice)
508-457-2310 (FAX)
sackerman@usgs.gov
CARIS processing for NOAA hydrographic survey H10993: The CARIS HIPS directory was received from the National Oceanic and Atmospheric Administration - National Geophysical Data Center (NOAA-NGDC). The multibeam bathymetric data from NOAA was delivered fully processed and tide-corrected by NOAA Hydrographers. The CARIS HIPS project was reviewed and checked for any inconsistencies. Survey lines outside of the Duxbury to Hull survey area were removed from the project.
Person who carried out this activity:
508-548-8700 x2315 (voice)
508-457-2310 (FAX)
sackerman@usgs.gov
Person who carried out this activity:
508-548-8700 x2315 (voice)
508-457-2310 (FAX)
sackerman@usgs.gov
Person who carried out this activity:
508-548-8700 x2315 (voice)
508-457-2310 (FAX)
sackerman@usgs.gov
Person who carried out this activity:
508-548-8700 x2315 (voice)
508-457-2310 (FAX)
sackerman@usgs.gov
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, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.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, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
Barnhardt, Walter A. , Andrews, Brian D. , Ackerman, Seth D. , Baldwin, Wayne E. , and Hein, Christopher J. , 2009, High-Resolution Geological Mapping of the Inner Continental Shelf: Cape Ann to Salisbury Beach, Massachusetts: Open-File Report 2007-1373, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
National Oceanic and Atmospheric Administration, 2003, Data Acquisition and Process Report - NOAA Ship Thomas Jefferson (August - November 2003): Data Acquisition and Process Report (DAPR) NOAA Ship Thomas Jefferson (August - November 2003), National Oceanic and Atmospheric Administration, National Geophysical Data Center (NGDC), National Geophysical Data Center, Boulder, CO.Online Links:
NOAA (National Oceanic and Atmospheric Administration), 2003, Descriptive Report, Basic Hydrographic Survey H10993, Approaches to Boston Harbor, Massachusetts Bay, Massachusetts: Descriptive Report (DR) H10993, National Oceanic and Atmospheric Administration, National Geophysical Data Center (NGDC), National Geophysical Data Center, Boulder, CO.Online Links:
Hydrographic survey H10993: Horizontal sounding positional control for the NOAA H10993 survey was determined using the Global Positioning System (GPS) corrected by U.S. Coast Guard differential GPS (DGPS) beacon stations. The primary and only DGPS beacon used for survey H10993 was Portsmouth Harbor, NH (Beacon No. 771). No horizontal control stations were established for the NOAA survey. Additional information may be found in the NOAA Descriptive Report for survey H10993, the Data Acquisition and Processing Report, and the Horizontal and Vertical Control Report. Field activity 06012: The SWATHPlus transducers were mounted on a rigid pole, approximately 2.6 m below the water line, along the starboard side of the R/V Megan T. Miller. Position data were provided by the Z-Surveyor Extreme for real-time kinematic (RTK) navigation (the Ashtech BR2G Differential Global Positioning System (DGPS) was used as a backup navigation system) and recorded to the raw data files (SXR) via SWATHPlus (version 2.07) on the acquisition computer. During some portions of the survey, technical difficulties caused the GPS systems to malfunction; in some instances the acquisition systems fell back on the DGPS navigation; but in some cases surveying was halted until a reliable GPS signal could be achieved. A conservative estimate of positional accuracy is estimated to be 10 m although when the system was recording RTK navigation the positional accuracy may be <1 m as RTK-GPS provides horizontal positional accuracies on the decimeter scale (<http://www.noaa.gov>; <http://www.nos.noaa.gov>; <http://www.ngs.noaa.gov>). Field activity 07001: The SWATHPlus transducers were mounted on a rigid pole, approximately 0.5 m below the water line, from the bow of the of the R/V Rafael of Woods Hole, MA. Position data were provided by the Ashtech Extreme for real-time kinematic (RTK) navigation (the Ashtech BR2G Differential Global Positioning System (DGPS) was used as a backup navigation system) and recorded to the raw data files (SXR) via SWATHPlus (version 3.X) on the acquisition computer. A conservative estimate of positional accuracy is estimated to be 10 m although when the system was recording RTK navigation the positional accuracy may be <1 m as RTK-GPS provides horizontal positional accuracies on the decimeter scale (<http://www.noaa.gov>; <http://www.nos.noaa.gov>; <http://www.ngs.noaa.gov>).
NOAA Hydrographic survey H10993: NOAA's National Ocean Service Hydrographic Surveys Specifications and Deliverables closely follow the International Hydrographic Organizations Standards for Hydrographic Surveys, Special Publication 44, Fifth Edition, February 2008, specifically for Order 1 surveys. Positioning and attitude on Launch 1005 were determined with a TSS POS/MV 320 (version 2) GPS aided inertial navigation system. Positioning and attitudes on Launch 1014 were determined with a TSS POS/MV 320 (version 3) GPS-aided inertial navigation system. Launch 1014 also used a Digibar Pro to measure surface sound velocity and achieve continuous refraction correctors at the transducer. The tidal datum for survey H10993 is Mean Lower Low Water (MLLW). The operating tide station at Boston, MA(844-3970) served as control for datum determination. Observed tide files were e-mailed by TideBot daily during acquisition and applied to all sounding data using preliminary zoning. Final zoning was received and applied with observed water levels. The verified water level data was received and was compared to the observed data. No difference between these verified and observed water level data were notice. Verified tides using final tide zoning were re-applied by NOAA's Atlantic Hydrographic Branch during post-processing. Refer to the Fall Data Acquisition and Processing Report (DAPR) and the Horizontal and Vertical Control Report, for detailed equipment, vessel configuration and setting information. USGS field activities 06012 and 07001: Vertical accuracy of the raw data based on system specifications may approximate 1% of water depth, 0.10.4 meters within the survey area. However, overall vertical accuracies on the order of 0.5 m or more are assumed based on the following considerations. In 2006, ship motion was recorded with a TSS DMS 2-05, used to correct for vessel roll, pitch, heave, and yaw. In 2007, the Octopus F180 Attitude and Positioning system was used to correct ship motion. RTK-GPS was used to establish water-level heights relative to Mean Lower Low Water (MLLW), providing decimeter-scale accuracies. Tide-correction was done in post-processing (see process steps). Refraction artifacts were minimized by acquiring a range of sound velocity profiles throughout the survey area to model the sound velocity structure of the water column. Changes in vessel draft due to fuel and water usage were not considered.
All quality main survey line bathymetric data (generally shore parallel for the USGS surveys) that were collected within the Duxbury to Hull survey area were incorporated in this grid. Approximately 125 square-km of additional bathymetric data were collected south of Brant Rock, Massachusetts during these field activities will be published in a subsequent data release focused on Cape Cod Bay. Soundings from the USGS surveys were processed and edited using Computer Aided Resource Information System (CARIS) Hydrographic Information Processing System (HIPS; ver. 6.1). Although the soundings were manually edited, small data spikes may exist at outer edges of some swaths. In addition, small gaps between adjacent survey lines may exist in depth less than 14 meters. Tielines (generally shore perpendicular) were not used in grid generation but used to verify tide corrections during post-processing. NOAA's CARIS directory for survey H10993 was provided to the USGS. No additional swath processing or navigation editing was performed to the NOAA data in CARIS. The GPS navigation and bathymetric attitude data were significantly hindered by interference during the first leg of survey 06012 (lines l1f1 - l99f2, 4-14 Aug 2006). Frequent navigation dropouts halted data collection for extended periods during the survey and problems with the ADU2 compass resulted in un-usable bathymetric data along survey tracklines that have valid navigation.
This image represents the un-interpolated data; gaps occurred along-track and between adjacent lines.
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.
508-548-8700 x2315 (voice)
508-457-2310 (FAX)
sackerman@usgs.gov
Downloadable Data
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.
| Data format: | WinZip file containing the GeoTIFF image (including world file) of swath bathymetric data from the Duxbury to Hull survey area. in format WinZip (version 9.0) ESRI Raster GRID format Size: 24 MB |
|---|---|
| Network links: |
<https://pubs.usgs.gov/of/2009/1072/GIS/raster/bathy/DH_bathyhlshd_wgaps.zip> |
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DVD-ROM
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This zip file contains a GeoTIFF image with an accompanying world file in Environmental Systems Research Institute (ESRI) format. To utilize this data, the user must have an image viewer, image processing or GIS software package capable of importing a GeoTIFF image. A free spatial data viewer, ArcExplorer, capable of displaying the GeoTIFF image data is available from ESRI at www.esri.com.
508-548-8700 x2315 (voice)
508-457-2310 (FAX)
sackerman@usgs.gov
