|Range of values|
The backscatter data collected along these tracklines were used to define the seafloor morphology as part of the Massachusetts Seafloor Mapping Project. This dataset contains approximately 1840 linear kilometers of trackline navigation for interferometric sonar (Systems Engineering and Assessment Ltd. SWATHPlus-M) backscatter data collected by the U.S. Geological Survey during USGS survey 2013-003-FA in 2013 offshore of Massachusetts, south of Martha's Vineyard and north of Nantucket.
JD143 15:20 - JD146 20:06 (no data were collected on JD144 or JD145) JD149 15:40 - JD151 18:59 (no data were collected on JD150) JD153 00:01 - JD153 14:32 JD155 18:16 - JD156 02:06 JD158 06:12 - JD160 19:15 (no data were collected on JD159)
Are there legal restrictions on access or use of the data?
Use_Constraints: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 source of this information.
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:||Trackline navigation for swath backscatter data (interferometric-sonar) collected by the U.S. Geological Survey offshore of Massachusetts south of Martha's Vineyard and north of Nantucket. This includes associated metadata. in format SHP (version SpatiaLite) polyline shapefile Size: 7.6|
|Media you can order:||DVD-ROM (Density 4.75 GB) (format UDF)|
This zip file contains data available in Esri shapefile format. The zip file also contains associated metadata. The user must have software to read and process the data file. A free data viewer, ArcExplorer, capable of displaying the data is available from Esri at www.esri.com.