The geophysical mapping utilized a suite of high-resolution instrumentation to map the surficial sediment distribution, depth and sub-surface geology: dual-frequency 100/500 KHz sidescan-sonar system, 234-KHz interferometric sonar, and 500 Hz -12 KHz chirp sub-bottom profiler. The survey was conducted aboard the M/V Megan Miller August 9-13, 2007. The study area covers 35 square kilometers from about 0.2 km to 5-km offshore of the south shore of Martha's Vineyard, and ranges in depth from ~ 5 to 20 meters.
U.S. Geological Survey, 2009, BATHY_10SEC.SHP: Navigation at 10 second interval of swath bathymetry collected by the U.S. Geological Survey off the southern shore of Martha's Vineyard, 2007 (ESRI POINT SHAPEFILE): Open-File Report 2008-1288, U.S. Geological Survey, Woods Hole.This is part of the following larger work.Online Links:
- <https://pubs.usgs.gov/of/2008/1288/GIS_catalog/Tracklines/bathy_10sec.zip>
- <https://pubs.usgs.gov/of/2008/1288/html/gis.html>
Denny, J.F., Danforth, W.W., Foster, D.S., and Sherwood, C.R., 2009, Geophysical Data Collected off the South Shore of Martha's Vineyard, Massachusetts: Open-File Report 2008-1288, U.S. Geological Survey, Woods Hole.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.
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.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
Range of values | |
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Minimum: | 366077.72 |
Maximum: | 373559.87 |
Units: | meters |
Range of values | |
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Minimum: | 4573440.03 |
Maximum: | 4578553.06 |
Units: | meters |
USGS naming classification for collected lines of data. The format is: L1F1, where L=line, 1= Number, F=File, and 1=File number
Range of values | |
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Minimum: | 221 |
Maximum: | 225 |
Units: | Julian Day (Year 2007) |
Range of values | |
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Minimum: | 0 |
Maximum: | 23 |
Units: | hours (24-hour clock) |
Range of values | |
---|---|
Minimum: | 0 |
Maximum: | 59 |
Units: | minutes |
Range of values | |
---|---|
Minimum: | 0 |
Maximum: | 59 |
Units: | seconds |
Range of values | |
---|---|
Minimum: | -70.600116 |
Maximum: | -70.511202 |
Units: | decimal degrees |
Range of values | |
---|---|
Minimum: | 41.301543 |
Maximum: | 41.347505 |
Units: | decimal degrees |
Value | Definition |
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07011 | USGS Cruise Identification Number where the first two numbers indicate the year, and the last three indicate the cruise within that year |
U.S. Geological Survey
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov
This data set contains 10 second navigation fixes for approximately 1010 km of swath bathymetric data collected by the U.S. Geological Survey during a Woods Hole Science Center cruise 07011 off the southern shore of Martha's Vineyard, 2007.
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Data files were recorded by SEA software SWATHplus in the SWATHplus SXR format. Data collection parameters are saved into a SWATHplus session file in SEA's sxs format that can be later used for data replay.
Pitch, roll, heading, and heave information were recorded using a Coda Octopus F180R motion reference unit (MRU) (see: <http://www.codaoctopus.com/motion/f180/index.asp>) and transmitted via network connection to the SWATHplus data collection software. The MRU sensor was mounted directly above the SWATHplus transducers, thereby minimizing "lever arm" offsets which can lead to positioning and depth errors in the bathymetric data. The F180R series MRU uses two L1 antennas for position and heading accuracy. These were mounted directly above the MRU with an offset of 6.76 meters. The antennas are mounted on a rigid horizontal pole with a separation of 1 meter and are offset from the MRU in a forward/aft configuration. The forward offset of the primary antenna from the MRU is 0.5 meters, with no port/starboard offset.
Sound Velocity Profiles (SVP): Fourteen sound velocity casts were collected at various intervals during the USGS cruise 07011 using an Applied Microsystems SV Plus v2 instrument (see <http://www.appliedmicrosystems.com/products/productDetails.aspx?id=1> for details). Sound velocity profiles (SVP) were generally collected at the eastern and western ends of the survey area, corresponding to the start and/or end of geophysical line data collection. This procedure was primarily followed to coordinate collection of SVP casts with the beginning or end of trackline. This was acceptable because only small variations in the speed of sound were noted throughout the survey area and negligible refraction artifacts were visible within the swath bathymetric data.
Person who carried out this activity:
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov
Beaudoin, Jonathan, 2002, Hitchhiker's Guide to Swathed...: University of New Brunswick Ocean Mapping Group, Fredericton, New Brunswick.Online Links:
Differential Global Positioning System (DGPS) navigation data were acquired with the forward, or primary, F180R DGPS antenna and transmitted via a network connection to the SWATHplus data collection software. The F180R motion reference unit consists of 2 L1 antennas used for position and heading. The antennas are mounted on a rigid horizontal pole and are offset from the MRU in a forward/aft configuration (see full description of F180R under motion below). DGPS accuracy is 1 to 3 meters, depending on the distance from a US Coast Guard coastal repeater station (<http://www.navcen.uscg.gov/>).
All bathymetric data collected during USGS cruise 07011 off of the south shore of Martha's Vineyard were used to generate the bathymetric 10 second navigation shapefile.
All data were evaluated during processing as a standard quality control procedure. Any spurious navigation fixes were flagged and filtered during processing of the raw bathymetric data, thus not included in this dataset.
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. 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) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@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 swath bathymetric trackline navigation data collected by the U.S. Geological Survey off the southern shore of Martha's Vineyard, 2007 and associated metadata. in format WinZip (version 9.0) Size: 1.2 MB |
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Network links: |
<https://pubs.usgs.gov/of/2008/1288/GIS_catalog/Tracklines/bathy_10sec.zip> |
This zip file contains data available in Environmental Systems Research Institute (ESRI) point shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com.
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov