Page C. Valentine Jessica L. Baker Tanya S. Unger 2005 1.0 vector digital data Scientific Investigations Map 2840 Woods Hole Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program http://pubs.usgs.gov/sim/2005/2840/data/bathy/bathy.zip Page C. Valentine, editor 2005 1.0 Scientific Investigations Map 2840 Woods Hole Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program scale 1:60,000, 6 maps, 12 sheets http://pubs.usgs.gov/sim/2005/2840/ bathy This data set contains the sea floor topographic contours generated from a multibeam sonar survey of the Stellwagen Bank National Marine Sanctuary region off Boston, Massachusetts, an area of approximately 1100 square nautical miles. The Stellwagen Bank NMS Mapping Project is designed to provide detailed maps of the Stellwagen Bank region's environments and habitats and the first complete multibeam topographic and sea floor characterization maps of a significant region of the shallow EEZ. Data were collected on four cruises over a two year period from the fall of 1994 to the fall of 1996. The surveys were conducted aboard the Canadian Hydrographic Service vessel Frederick G. Creed, a SWATH (Small Waterplane Twin Hull) ship that surveys at speeds of up to 16 knots. The multibeam data were collected utilizing a Simrad Subsea EM 1000 Multibeam Echo Sounder (95 kHz) that is permanently installed in the hull of the Creed. Development of interpretive seabed maps, sea floor imagery, and a GIS database that are accessible to scientists, policymakers, managers, and the general public. en 1994 1998 ground condition Complete As needed -71.021510 -69.816685 42.851518 41.666379 -58715.740636 41650.111188 3803530.371472 3936439.003296 General Topographic data Sea Floor Topography Bathymetry Geographic Information Systems GIS U.S. Geological Survey USGS Coastal and Marine Geology Program CMGP Woods Hole Science Center WHSC Frederick G. Creed Swath Bathymetry bathymetric contours polyline shapefile Stellwagen Bank National Marine Sanctuary SBNMS Massachusetts Gulf of Maine Atlantic Ocean General Massachusetts Bay Cape Cod Bay oceans and estuaries ISO 19115 Topic Category elevation None 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. Bathymetry is not to be used for navigational purposes. Page C. Valentine U.S. Geological Survey Research Geologist mailing and physical address

U.S. Geological Survey

384 Woods Hole Rd.

Woods Hole MA 02543-1598 USA (508) 548-8700 x2239 (508) 457-2310 pvalentine@usgs.gov Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535 Page C. Valentine Tammie J. Middleton Sarah J. Fuller 2001 1.01 Open-File Report 00-410 http://pubs.usgs.gov/of/of00-410/ Woods Hole Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program Page C. Valentine Jessica L. Baker Tanya S. Unger 2003 1.0 map Geologic Investigations Map I-2676-A U.S. Geological Survey, Coastal and Marine Geology Program Woods Hole Science Center, Woods Hole, MA Page C. Valentine Tanya S. Unger Jessica L. Baker 2003 1.0 map Geologic Investigations Map I-2676-B U.S. Geological Survey, Coastal and Marine Geology Program Woods Hole Science Center, Woods Hole, MA Page C. Valentine Tanya S. Unger Jessica L. Baker 2003 1.0 map Geologic Investigations Map I-2676-C U.S. Geological Survey, Coastal and Marine Geology Program Woods Hole Science Center, Woods Hole, MA Shapefile http://pubs.usgs.gov/sim/2005/2840/data/bathy/bathy-thumb.gif Thumbnail image showing extent and location of bathymetric contours in the Stellwagen Bank National Marine Sanctuary region. GIF Browse image showing extent and location of bathymetric contours in the Stellwagen Bank National Marine Sanctuary region. GIF http://pubs.usgs.gov/sim/2005/2840/data/bathy/bathy-browse.gif The ship's position was determined with an accuracy of 10 m or better using a Magnavox 4200 geographic positioning system (GPS) receiver in conjunction with differential GPS corrections transmitted by U.S. Coast Guard radio beacons. Sound velocity information was updated during the day whenever the survey moved from one area to another. Tidal corrections based on NOAA's Boston tide gauge were used to reference depth data to mean lower low water. Sounding rates depend on water depth but vary from 2 to 4 per second in water depths less than 100 meters. Horizontal spatial resolution at these sounding rates is on the order of 10% of the water depth at 16 knots; however, vertical resolution is approximately 1% or better in the same depth range. The bathymetric data are displayed in real time on the Sun workstation using software designed and written by the Ocean Mapping Group, University of New Brunswick. This display allows data gaps to be identified during the survey and also gives a measure of the data quality. Sounding rates depend on water depth but vary from 2 to 4 per second in water depths less than 100 meters. Horizontal spatial resolution at these sounding rates is on the order of 10% of the water depth at 16 knots; however, vertical resolution is approximately 1% or better in the same depth range. Sounding rates depend on water depth but vary from 2 to 4 per second in water depths less than 100 meters. Horizontal spatial resolution at these sounding rates is on the order of 10% of the water depth at 16 knots; however, vertical resolution is approximately 1% or better in the same depth range. The navigation and topographic data were both processed using SwathEd, a suite of bathymetric and multibeam software editing and display tools developed by Dr. John Hughes Clarke of the Ocean Mapping Group, University of New Brunswick (UNB). Tidal corrections were obtained from NOAA's Boston Tide Gauge (Station 8443970) and merged into the data set using UNB's tidal routines. The topographic information was converted into an ASCII text file containing lat, long, and depth fields, using a script created by Bill Danforth at the U.S. Geological Survey. The ASCII file was brought into Arc/Info, and a grid was generated and processed using ESRI's Arc/Info version 7.0.4 software. A point coverage containing depth values was created using the routine point-generate. The grid was created based on the depth values for each of the points using the command pointgrid. The grid was filtered with a 9 by 9 focalmedian filter. Contours were generated using latticecontour. All editing and edgematching was done by hand using arcedit. No additional checks for topological consistency were performed on the data. Vector String 2335 Simple Polyline FALSE 2335 TRUE FALSE coordinate pair 0.000256 0.000256 meters Mercator41.650000-70.3166670.0000000.000000 North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983 NAD_1983_Mercator bathy Shapefile Attribute Table Feature Class 2335 ESRI FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. FNODE_ From-node identifier of linear feature carried over from Arc/Info processing and the Arc/Info attribute FNODE_. It is an ArcInfo internal control parameter and has no applicable relevance to the use of the data. Software Computed 10 2633 integer count 1 Number 9 TNODE_ To-node identifier of linear feature carried over from Arc/Info processing and the Arc/Info attribute TNODE_. It is an ArcInfo internal control parameter and has no applicable relevance to the use of the data Software Computed 1 2634 integer count 1 Number 9 LPOLY_ Internal number of polygon to left of arc carried over from Arc/Info processing and the Arc/Info attribute LPOLY_. It is an ArcInfo internal control parameter and has no applicable relevance to the use of the data Software Computed -1 -1 integer count 1 Number 9 RPOLY_ Internal number of polygon to right of arc carried over from Arc/Info processing and the Arc/Info attribute RPOLY_. It is an ArcInfo internal control parameter and has no applicable relevance to the use of the data. Software Computed -1 -1 integer count 1 Number 9 LENGTH Length of the line in native units User defined 35.215 116472.308 meters .001 Number 19 3 BATHYMER_ Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Number 9 CONTOUR Depth of bathymetric contour. Values are in meters above sea level, so all values are negative. Double of width 13, but values are integer. Another attribute "INTERVAL" contains the same data stored as an integer. -270 -5 meters .000 5 m Number 9 3 USGS INTERVAL Depth of bathymetric contour, in meters above sea level. -270 -5 meters 5 5 m Number 9 USGS Page C. Valentine U.S. Geological Survey Research Geologist mailing and physical address

U.S. Geological Survey

384 Woods Hole Rd.

Woods Hole MA 02543-1598 USA (508) 548-8700 x2239 (508) 457-2310 pvalentine@usgs.gov Downloadable Data Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. SHP 1.985 1.985 3.3 ESRI shapefile The SHP file contains the geospatial data. The SHX file contains the index of the geospatial data. The DBF file contains the attribute data in dBASE format. The PRJ file contains the coordinate system information (optional). The AVL file contains the legend information (optional). The SBN and SBX files contain the spatial index of the geospatial data (optional). The XML file contains the metadata describing the data set <data set name>.shp.xml. An ASCII version of the metadata file. A browse graphic showing the data layer coverage and extent (optional). zip DVD-ROM UDF 4.75 Gbytes http://pubs.usgs.gov/sim/2005/2840/data/bathy/bathy.zip None These data are available in Environmental Systems Research Institute (ESRI) 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 the importing data. A free data viewer, arcexplorer, capable of displaying the data is available from ESRI at www.esri.com. 20050909 U.S. Geological Survey Page C. Valentine Research Geologist mailing and physical address

U.S. Geological Survey

384 Woods Hole Rd.

Woods Hole MA 02543-1598 USA (508) 548-8700 x2239 (508) 457-2310 pvalentine@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time None None en 20050822 http://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile 20050909 09573700 {073120AE-D459-4845-A40A-C2CA432BD30F} 20050815 11355900 FALSE 20050909 09573700 20050909 Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535 bathy -58715.740636 41650.111188 3936439.003296 3803530.371472 1 -71.02151 -69.816685 42.851518 41.666379 1 ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset 002 file://\\ERIHEFDTXP\dataforCD_081505\bathy\bathy.shp Local Area Network 1.985 Shapefile NAD_1983_Mercator 2335