2009-002-FA: <http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=2009-002-FA>
2010-004-FA: <http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=2010-004-FA>
2011-004-FA: <http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=2011-004-FA>
U.S. Geological Survey, 2014, VS_BATH5M_V2: Revised 5 meter ArcRaster grid of bathymetry acquired using a SEA Ltd. SWATHplus-M interferometric sonar offshore of Massachusetts within Vineyard Sound by the U.S. Geological Survey in 2009, 2010, and 2011 (Esri BINARY GRID, UTM 19N, WGS84).: Open-File Report 2012-1006, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts.This is part of the following larger work.Online Links:
- <http://pubs.usgs.gov/of/2012/1006/GIS/raster/bathymetry/vs_bathv5m_v2.zip>
- <http://pubs.usgs.gov/of/2012/1006/appendix.html>
Andrews, Brian D. , Ackerman, Seth D. , Baldwin, Wayne E. , Foster, David S. , and Schwab, William C. , 2014, High-Resolution Geophysical Data from the Inner Continental Shelf: Vineyard Sound, Massachusetts: Open-File Report 2012-1006, U.S. Geological Survey, Reston, VA.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.
| Range of values | |
|---|---|
| Minimum: | -37.9 |
| Maximum: | -3.61 |
| Units: | meters |
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This composite bathymetric grid is used to define the morphology of the seafloor for regional geological analysis. This grid includes the bathymetry collected by the USGS during surveys 2009-002-FA, 2010-004-FA, and 2011-004-FA in Vineyard Sound Massachusetts at 5 meter resolution.
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
The RTK signal from repeater station located at Gay Head was not received by the survey vessel for several hours on several days between May 22 and May 29 2010 during USGS Field Activity 2010-004-FA aboard the M/V Megan T. Miller. Earlier attempts to interpolate tide values for missing times were not effective. Instead, USGS requested and received a zone tidal model from the National Oceanic and Atmospheric Administration in December of 2013. Tides were delivered to USGS on 10 Feb and applied only to lines L114F1-L200f1 and including Tie1-Tie10f2 (JD141-JD149). The zone tidal model used verified tides at six minute intervals from three NOAA Tide stations Newport, RI (#84526600), Woods Hole, MA (#8447930), and Nantucket MA, (#8449130). The NOAA Zone Definition File was loaded into HIPS (ver 8.1.6) and merged with Lines L114f1-L200f1.
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Differential Global Positioning System (DGPS) navigation was used to determine the horizontal position (x, and y coordinates) of the GPS antenna mounted above the SWATHplus-M transducers with sub-meter accuracy. A motion reference unit (Coda Octopus F180) was mounted directly above the sonar transducers and continuously measured vertical displacement (heave) and attitude (pitch and roll) of the vessel during data acquisition. Horizontal offsets between navigation and attitude antennas and the SWATHplus-M transducers were applied during acquisition in the configuration files for the SWATHplus-M and Coda Octopus F180 software. Differential corrections were transmitted to the survey vessel by cellular modem and VHF radio from the base station established at the USGS Marine Operations Facility in Falmouth, MA.
A motion reference unit (Coda Octopus F180) was mounted directly above the sonar transducers and continuously measured vertical displacement (heave) and attitude (pitch and roll) of the vessel during data acquisition. Vertical offsets between navigation and attitude antennas and the SWATHplus-M transducers were applied during acquisition in the configuration files for the SWATHplus-M and Coda Octopus F180 software. Vertical accuracy of the raw data may approximate 1 percent of water depth, based on SWATHplus interferometric sonar system specifications, which translates to 0.1 to 0.37 meters within the Vineyard Sound survey area. Real Time Kinematic (RTK)-GPS was used to continuously measure changes in sea-surface elevations relative to the Mean Lower Low Water (MLLW)datum with decimeter-scale accuracies. Tide-correction was applied during post-processing (see process steps). Tide corrections using zone tidal model offsets were applied to portions of 2010-004-FA because the RTK signal was interrupted from 22 to 29 May, 2010. The vertical accuracy of these lines is dependent on the observed data from the three tide stations which NOAA publishes as +/- 1.6 cm from Massachusetts to the Gulf of Maine. See Table 3 at NOAA VDatum website <http://vdatum.noaa.gov/docs/est_uncertainties.html#estData>
Refraction artifacts were minimized by sound velocity profiles throughout the survey area to model the spatial and temporal variability of sound velocity structure of the water column. Changes in vessel draft due to fuel and water usage were not considered.
This grid does not include all bathymetric data collected in the Vineyard Sound survey area. Bathymetry data collected along transit lines, seismic-reflection tie lines and other sections of lines of poor quality were excluded from this grid. Survey lines not included in this grid are: 2009-002-FA L63f1, L64f1, L74f1 2010-004-FA Patch2_1- Patch2_7, TIE8F1-TIE20F1, L286F1 2011-004-FA: Patch1-Patch7, L130F1, TIE1, TIE8-TIE15.
Any spurious data points were removed during processing. Portions of this grid were interpolated to fill small gaps that occurred between adjacent bathymetric survey lines; although interpolation did not fill all gaps. Tide corrections using a zone tide model were applied to the following lines from 2010-004-FA and supersede the previous RTK tide corrections (ver 1.0) L114f1- L200F1, between julian day 141 and julian day 149.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- These data are not 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.
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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: | This WinZip (v. 14.0) file contains the Esri 32-bit floating point ArcRaster Grid, accessory info folder, and associated metadata for the swath bathymetry collected within the Vineyard Sound, Massachusetts survey area. in format AIG (version ArcGIS 9.3) Esri Raster GRID format Size: 37.3 Mb |
|---|---|
| Network links: |
<http://pubs.usgs.gov/of/2012/1006/GIS/raster/bathymetry/vs_bath5m_v2.zip> <http://pubs.usgs.gov/of/2012/1006/appendix.html> |
| Media you can order: |
DVD-ROM
(Density 4.75
Gbytes)
(format UDF)
|
These data are available as an 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. 14.0) 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 because the same info folder is included in the other gridded datasets.
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