Page C. Valentine Tanya S. Unger Jessica L. Baker 2005 1.0 remote-sensing image Scientific Investigations Map2840 Woods Hole Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program http://pubs.usgs.gov/sim/2005/2840/data/sunillum/sunillum.zip Page C. Valentine 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/ sunillum.tif The sun-illuminated topographic imagery of the Stellwagen Bank National Marine Sanctuary region off Boston, Massachusetts covers 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. 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 -70.6 -70.0333 42.8 42.0833 -23598.54000023581.4600003850013.7200003930613.720000 General 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 topographic data sea floor topography bathymetry sun-illuminated imagery gray scale image GeoTIFF image General Massachusetts MA Stellwagen Bank National Marine Sanctuary SBNMS Shallow EEZ EEZ Gulf of Maine Atlantic Ocean Boston oceans and estuariesimageryBaseMapsEarthCoverISO 19115 Topic Categoryelevation 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. 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 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, MAU.S. Geological Survey, Coastal and Marine Geology Program 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, MAU.S. Geological Survey, Coastal and Marine Geology Program Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535Raster Datasethttp://pubs.usgs.gov/sim/2005/2840/data/sunillum/sunillum-thumb.gifGIFThumbnail image showing overview of the sun-illuminated topographic imager of the seafloor in the Stellwagen Bank National Marine Sanctuary region.http://pubs.usgs.gov/sim/2005/2840/data/sunillum/sunillum-browse.gifGIFImage showing overview of the sun-illuminated topographic imager of the seafloor in the Stellwagen Bank National Marine Sanctuary region. 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. At the start of each day, casts were made to record the sound velocity profile of the water column in the area to be surveyed. 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 edited using SwathEd, a suite of 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. The shaded relief images shown here were created using a light source that is 45 degrees above the horizon from an azimuth of 350 degrees. The vertical exaggeration in the images is four times. In effect, topographic relief is enhanced by illuminating the sea floor from a position 10 degrees west of north so that shadows are cast on the southern flanks of seabed features. Some features in the images are artifacts of data collection. They are especially noticeable where the seabed is smooth and include small highs and lows and unnatural-looking features and patterns that are oriented parallel or perpendicular to survey tracklines. Raster Pixel 8060 4718 1 10.00000010.0000008Upper LeftFALSENone1pixel codesTRUETIFF Mercator 41.65 -70.3167 0 0 row and column 10.000000 10.000000 meters North American Datum of 1983 Geodetic Reference System 80 Sun-illuminated topographic imagery combines contoured topography and sun-illuminated topographic imagery. The image shown here uses a sun elevation angle of 45 degrees above the horizon from an azimuth of 350 degrees and a vertical exaggeration of four times. In effect, topographic relief is enhanced by having the sun illuminate the sea floor from a position 10 degrees west of north so that shadows are cast on the southern flanks of seabed features. Unnatural-looking stripes and patterns oriented parallel or perpendicular to survey track lines are artifacts of data collection. Blank areas represent places where no data exists. The topographic imagery is identical to that shown on Sheet 3 of this report. 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. TIFF 0.000 0.000GeoTIFFA zip archive containing the GeoTIFF image, associated world file, and metadata.zip DVD-ROM UDF 4.75Gbytes http://pubs.usgs.gov/sim/2005/2840/data/sunillum/sunillum.zip None This image is available as a GEOTIFF image with an accompanying world file. To utilize this data, the user must have an image viewer, image processing or GIS software package capable of importing a GeoTIFF image. 20050823 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 USA (508) 548-8700 x2239 (508) 457-2310 pvalentine@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time en20050822NoneNonehttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile 2005082306455500{B38EF526-D2FD-4A02-BDB0-D401F3E7FD2C}2005080915532900FALSE200508230645550020050823Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535sunillum.tif-23598.5423581.463930613.723850013.721ISO 19115 Geographic Information - MetadataDIS_ESRI1.0dataset002file://\\Erihefdtxp\G_DATA\SBNMSI-maps\dataforCD_081505\sunillum\sunillum.tifLocal Area Network0.000Raster Dataset21471810unknown806010unknown