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 https://doi.org/10.3133/sim2840 http://pubs.usgs.gov/sim/2005/2840/DATA/bathy/bathy.zip Page C. Valentine (editor) 2005 1.0 Scientific Investigations Map 2840 Reston, VA U.S. Geological Survey scale 1:60,000, 6 maps, 12 sheets. Suggested citation: Valentine, P.C., Baker, J.L., Unger, T.S., Sculy, L.A., Fuller, S.J., 2005, 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: U.S. Geological Survey Scientific Investigations Map 2840, https://doi.org/10.3133/sim2840. https://doi.org/10.3133/sim2840 http://pubs.usgs.gov/sim/2005/2840/ 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. For additional information about the field activities associated with this dataset, see https://cmgds.marine.usgs.gov/fan_info.php?fan=1994-008-FA, https://cmgds.marine.usgs.gov/fan_info.php?fan=1995-013-FA, https://cmgds.marine.usgs.gov/fan_info.php?fan=1996-032-FA, https://cmgds.marine.usgs.gov/fan_info.php?fan=1996-043-FA. 1994 1998 ground condition Complete As needed -71.021510 -69.816685 42.851518 41.666379 USGS Metadata Identifier USGS:9bee7456-70e8-42c1-bd4f-84f48e02cbbe None 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 ISO 19115 Topic Category oceans elevation USGS Thesaurus marine geology bathymetry multibeam sonar sea-floor characteristics marine geophysics geospatial datasets None Stellwagen Bank National Marine Sanctuary SBNMS Massachusetts Gulf of Maine Atlantic Ocean Massachusetts Bay Cape Cod Bay 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 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 http://pubs.usgs.gov/sim/2005/2840/data/bathy/bathy-browse.gif Browse image showing extent and location of bathymetric contours in the Stellwagen Bank National Marine Sanctuary region. GIF 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 2000-410 Woods Hole Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program http://pubs.usgs.gov/of/of00-410/ https://doi.org/10.3133/ofr00410 Page C. Valentine Jessica L. Baker Tanya S. Unger 2003 1.0 map Geologic Investigations Map I-2676-A Woods Hole Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program https://doi.org/10.3133/i2676A Page C. Valentine Tanya S. Unger Jessica L. Baker 2003 1.0 map Geologic Investigations Map I-2676-B Woods Hole Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program https://doi.org/10.3133/i2676B Page C. Valentine Tanya S. Unger Jessica L. Baker 2003 1.0 map Geologic Investigations Map I-2676-C Woods Hole Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program https://doi.org/10.3133/i2676C 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. No additional checks for topological consistency were performed on the data. 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. unknown The metadata was edited to remove errors as well as update some information. Edits include modifying the title to move the dataset name to the end of the title, adding the DOI link in the identification section, added the suggested citation, added supplemental information with link to the related field activity pages on CMGDS, added the USGS Thesaurus keywords, added keywords section with USGS persistent identifier as theme keyword, added online links to cross-references, replaced distribution liability with FSP statement, used a generic email address in metadata. The metadata date (20050822), but not the contact (except email and contact instructions) was updated. The metadata available from a harvester may supersede metadata available from the publication. Compare the metadata dates to determine which metadata file is most recent. Original edits on 20210816. An additional author name fix on 20210908. Links to the data were fixed with respect to case-sensitivity issues. (20230427) 20230427 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Vector String 2335 Mercator 41.650000 -70.316667 0.000000 0.000000 coordinate pair 0.000256 0.000256 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 bathy Shapefile Attribute Table 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 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 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 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 LENGTH Length of the line in native units User defined 35.215 116472.308 meters .001 BATHYMER_ Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. 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. USGS -270 -5 meters 5 m INTERVAL Depth of bathymetric contour, in meters above sea level. USGS -270 -5 meters 5 5 m 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 Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. SHP 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 1.985 http://pubs.usgs.gov/sim/2005/2840/DATA/bathy/bathy.zip DVD-ROM 4.75 Gbytes UDF 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. 20230407 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 whsc_data_contact@usgs.gov The metadata contact email address is a generic address in the event the contact person is no longer with the USGS. FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time None None