This grid represents approximately 200 square kilometer of bathymetric data that were collected in 2003, 2006 and 2007. This is a merged grid 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 grid 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.
Are there legal restrictions on access or use of the data?
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.
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 ARC/INFO ASCII GRID of swath bathymetric data from the Duxbury to Hull survey area. in format AAIGrid (version 9.0) ESRI Raster GRID format Size: 15|
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This zip file contains an ARC/INFO ASCII GRID in Environmental Systems Research Institute (ESRI) format. To utilize this data, the user must have a GIS software package capable of importing or converting the ARC/INFO ASCII GRID. A depth-colored hillshade GeoTIFF image of this dataset is also on this report (DH_bathyhlshd_wgaps.tif). The GeoTIFF image version can be viewed with any software capable of opening a TIFF image or in ArcExplorer, a free GIS viewer capable of displaying the GeoTIFF image data (available from ESRI at www.esri.com).