This data set contains a grid representing hillshaded relief derived from elevations (NAVD88) of the Holocene transgressive unconformity (Ut) beneath the Massachusetts inner shelf between Nahant and northern Cape Cod Bay. These data are useful for assessing relations between geologic framework, sea-bed morphology, and sediment textural trends.
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 (USGS) as the source of this information. Additionally, there are limitations associated with eologic mapping interpretations. Because of the scale and line spacing of the source seismic profiles, not all changes in seafloor geology are captured. Horizons are inferred between seismic lines, and unit exents and thicknesses should be considered an approximation of the location of a change in geology. Further, a constant seismic velocity of 1,500 m/s was assumed for all profiles in all sediment types, which may result in inaccurate depths of stratigraphic units.
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 U.S. Geological Survey 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 contains a GeoTIFF image with a world file (and associated metadata) that illustrates hillshaded reilef derived from elevations of the Holocene transgressive unconformity beneath the Massachusetts inner shelf between Nahant and northern Cape Cod Bay. in format GeoTIFF (version ArcGIS 9.3.1) GeoTIFF Size: 0.34|
The image contained in the zip file is available as a GeoTIFF with a world file. To utilize this data, the user must have an image viewer, or an image processing or GIS software package capable of importing a TIFF image.