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, CON_5M: 5-meter contours produced from bathymetric data collected by the U.S. Geological Survey off the southern shore of Martha's Vineyard, MA, 2007 (ESRI POLYLINE 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/Bathy/con_5m.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 | |
|---|---|
| Minimum: | 1 |
| Maximum: | 8 |
| Range of values | |
|---|---|
| Minimum: | -10 |
| Maximum: | -20 |
| Units: | meters |
U.S. Geological Survey
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov
This polyline shapefile represents 5-meter interval bathymetric contours generated from bathymetric data collected off the southern shore of Martha's Vineyard, MA, 2007. These data are used to define the regional seafloor morphology off the southern shore of Martha's Vineyard.
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.
Draft of the MRU below water line: 2.6 meters.
Offset of SWATHplus transducer 1 (port side) from the CRP: Height offset: 0.158 meters Forward offset: -0.019 meters Starboard offset: -0.11 meters
Offset of SWATHplus transducer 2 (starboard side) from the CRP: Height offset: 0.158 meters Forward offset: -0.019 meters Starboard offset: 0.11 meters
Software: SWATHplus 3.05.19
Person who carried out this activity:
(508) 548-8700x2274 (voice)
5084572310 (FAX)
bdanforth@usgs.gov
Person who carried out this activity:
(508) 548-8700x2274 (voice)
5084572310 (FAX)
bdanforth@usgs.gov
Person who carried out this activity:
(508) 548-8700x2274 (voice)
5084572310 (FAX)
bdanforth@usgs.gov
Software: SWATHplus 3.05.19
Person who carried out this activity:
(508) 548-8700x2274 (voice)
5084572310 (FAX)
bdanforth@usgs.gov
Person who carried out this activity:
(508) 548-8700x2274 (voice)
5084572310 (FAX)
bdanforth@usgs.gov
Person who carried out this activity:
(508) 548-8700x2274 (voice)
5084572310 (FAX)
bdanforth@usgs.gov
Person who carried out this activity:
(508) 548-8700x2274 (voice)
5084572310 (FAX)
bdanforth@usgs.gov
Person who carried out this activity:
(508) 548-8700x2274 (voice)
5084572310 (FAX)
bdanforth@usgs.gov
Software: CARIS HIPS/SIPS 6.1
Person who carried out this activity:
(508) 548-8700x2274 (voice)
5084572310 (FAX)
bdanforth@usgs.gov
Person who carried out this activity:
(508) 548-8700x2274 (voice)
5084572310 (FAX)
bdanforth@usgs.gov
Person who carried out this activity:
(508) 548-8700x2274 (voice)
5084572310 (FAX)
bdanforth@usgs.gov
Person who carried out this activity:
(508) 548-8700x2274 (voice)
5084572310 (FAX)
bdanforth@usgs.gov
Software: IVS DMagic 6.7.0
Person who carried out this activity:
(508) 548-8700x2274 (voice)
5084572310 (FAX)
bdanforth@usgs.gov
Software: ESRI ArcGIS 9.2
Person who carried out this activity:
(508) 548-8700x2311 (voice)
5084572310 (FAX)
jdenny@usgs.gov
Person who carried out this activity:
508-548-8700 x2311 (voice)
508-457-2310 (FAX)
jdenny@usgs.gov
Differential Global Positioning System (DGPS) navigation data were acquired with the forward, or primary, Coda Octopus F180R Motion Reference Unit (MRU) DGPS antenna and transmitted via a network connection to the SWATHplus data collection software. The F180R MRU is part of the rigid sidemount used to deploy the SWATHplus bathymetric system, and is mounted on the bracket holding the SWATHplus transducers. The F180R MRU consists of 2 L1 antennas used for position and heading. The antennas are mounted on a rigid horizontal pole, 6.76 meters above the F180R MRU, offset in a forward/aft configuration (see 'source contribution' for a full description of the F180R). DGPS accuracy is 1 to 3 meters, depending on the distance from a US Coast Guard coastal repeater station (<http://www.navcen.uscg.gov/>).
Bathymetric data were ultimately referenced to a local vertical datum. The Woods Hole Oceanographic Institution Martha's Vineyard Coastal Observatory (MVCO) maintains an instrumented node at a depth of 12 meters that records a variety of oceanographic data including water level heights above the node (<http://www.whoi.edu/mvco/description/description2.html>). Oscillation of the water level above the node is recorded in a file that was downloaded and parsed for these heights (OcnDat_s, see: <http://www.whoi.edu/mvco/data/oceandata.html>). These heights are referenced to a vertical datum of 11.68 meters, which represents a long term mean depth directly above the node (August 2006 - present). These data are not tied into any chart datum (i.e. Mean Lower Low Water). We chose to use the local water level heights because other oceanographic data from the 12-meter node will be used in conjunction with the bathymetric grid for oceanographic modeling. All data will be referenced to the local vertical datum at the 12-meter node.
All bathymetric data collected during USGS cruise 07011 off of the south shore of Martha's Vineyard were used to generate the bathymetric contours. Tie lines that fell close to areas of obstruction (e.g. MVCO 12-m node and tower), were not included in the final grid due to poor data quality.
All bathymetric data were collected during USGS cruise 07011 using a SWATHplus swath bathymetric system and a Coda Octopus F180R motion reference unit. Quality control was conducted during processing of the data. Any spurious data or artifacts were removed or minimized.
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 a shapefile with bathymetric contours off the southern shore of Martha's Vineyard, MA, and associated metadata in format WinZip (version 9.0) Size: 101 KB |
|---|---|
| Network links: |
<https://pubs.usgs.gov/of/2008/1288/GIS_catalog/Bathy/con_5m.zip> |
This zip file contains data available in Environmental Systems Research Institute (ESRI) polyline 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.
508-548-8700 x 2311 (voice)
508-457-2311 (FAX)
jdenny@usgs.gov
