Sea Floor Image Maps Showing Topography, Sun-Illuminated Topography, Backscatter Intensity, Ruggedness, Slope, and the Distribution of Boulder Ridges and Bedrock Outcrops in the Stellwagen Bank National Marine Sanctuary Region off Boston, Massachusetts
Sea floor mapping in the Stellwagen Bank National Marine Sanctuary (NMS) is a cooperative effort of the U.S. Geological Survey (USGS) and the National Oceanic and Atmospheric Administration, with technical support from the University of New Brunswick and the Canadian Hydrographic Service. The maps generated from this undertaking are based on a 1994–96 survey that used a multibeam echo sounder to map 1,100 square nautical miles of the sea floor (fig. 1).
Using this DVD-ROM and System Requirements
This DVD-ROM was produced in accordance with the UDF standards. Contents are intended for use on UNIX, Macintosh, or Windows platforms. However, GIS data are viewable on Windows and UNIX platforms.
This DVD-ROM publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark , manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data published on the disc have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data, software, or related materials. The maps are not to be used for navigational purposes.
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File Formats and Directories
The maps and their components are included in this DVD-ROM in six different formats:
Directory CSS: This directory includes the style sheet used for HTML formatting on this disc.
Directory DATA: This directory has the data files used to compile the maps, including ESRI-formatted GIS files, PDF map files, TIF images, and metadata.
Directory ESRI GIS: This directory has the ESRI-formatted winzip files of features and surfaces, as well as their associated metadata. Projection information for each file is noted in the individual metadata.
Directory HTML: This directory has HTML files used for documentation on this DVD-ROM including: map sheet discussions and figures; geographic names; references list; citation formats for maps on this disc; methods; and metadata. See Contents section of this disc.
Directory IMAGES: This directory has JPG and GIF images of: location maps (figs. 1, 2); backscatter, ruggedness, and slope indices; and other graphics associated with some of the HTML files.
Directory TIF: This directory has winzip files of TIFs, associated TIF World Files (TWF), and associated metadata that can be incorporated into a GIS database for use with ArcGIS. The TIF World Files project the TIFs in a Mercator projection, with Geodetic Reference System 1980 and North American Datum 1983. See Contents section of this disc.
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