U.S. Geological Survey U.S. Army Corps of Engineers 2017 1.0 vector digital data data release DOI:10.5066/F74B2ZGX Woods Hole Coastal and Marine Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program https://doi.org/10.5066/F74B2ZGX https://www.sciencebase.gov/catalog/item/5882629ae4b0dc04318b6de2 Bradford Butman William W. Danforth John E. Hughes Clarke Richard P. Signell 2017 1.0 data release DOI:10.5066/F74B2ZGX Reston, VA U.S. Geological Survey Suggested citation: Butman, Bradford, Danforth, W.W., Clarke, J.E.H., and Signell, R.P., 2017, Bathymetry and backscatter intensity of the sea floor of the Historic Area Remediation Site in 1996, 1998, and 2000: U.S. Geological Survey data release, https://doi.org/10.5066/F74B2ZGX. https://doi.org/10.5066/F74B2ZGX Surveys of the bathymetry and backscatter intensity of the sea floor of the Historic Area Remediation Site (HARS), offshore of New York and New Jersey, were carried out in 1996, 1998, and 2000 using a Simrad EM1000 multibeam echosounder mounted on the Canadian Coast Guard ship Frederick G. Creed. The objective of the multiple echosounder surveys was to map the bathymetry and surficial sediments over time as dredged material was placed in the HARS to remediate contaminated sediments. Maps derived from the multibeam surveys show sea-floor bathymetry, shaded-relief bathymetry, and backscatter intensity (a measure of sea-floor texture and roughness) at a spatial resolution of 3 meters. The area was mapped by the U.S. Geological Survey in cooperation with the U.S. Army Corps of Engineers and with support from the Canadian Hydrographic Service and the University of New Brunswick. The navigation polyline shapefile records the trackline followed by the Canadian Coast Guard ship Frederick G. Creed in the 1998 survey of the Historic Area Remediation Site. The tracklines can be used to identify line spacing, trackline orientation, and the location of data collection. The 1998 survey was carried out along tracklines running north-south and spaced about 100 m apart. The attributes record the latitude, longitude, date, and time at the start of each line. These tracklines were not included with the original release of the HARS data. Maps and interpretations of these data are available in Butman and others (2002), Butman (2002), and Butman and others (2003) (citations in cross references). Other datasets from the 1996 HARS survey, as well as datasets from surveys of the HARS in 1998 and 2000, may be found in Butman and others (2017) (see larger work citation). 19981030 19981104 ground condition Complete None planned -73.900092 -73.816550 40.435920 40.345650 USGS Metadata Identifier USGS:5882629ae4b0dc04318b6de2 none tracklines navigation polyline shapefile multibeam sea floor sea floor mapping Simrad EM1000 Canadian Coast Guard ship (CCGS) Frederick G. Creed WHCMSC field activity 1998-015-FA Woods Hole Coastal and Marine Science Center (WHCMSC) Coastal and Marine Geology Program (CMGP) U.S. Geological Survey (USGS) Canadian Hydrographic Service (CHS) University of New Brunswick (UNB) U.S. Army Corps of Engineers (USACE) Open-File Report 00-503 ISO 19115 Topic Category oceans location USGS Thesaurus navigational data marine geophysics geospatial datasets none Historic Area Remediation Site (HARS) Hudson Shelf Valley New York Bight Middle Atlantic Bight New York New Jersey North Atlantic Ocean none 1998 none none U.S. Geological Survey Bradford Butman mailing and physical address

Woods Hole Coastal and Marine Science Center

384 Woods Hole Road

Woods Hole MA 02543 USA 508-548-8700 x2212 bbutman@usgs.gov https://www.sciencebase.gov/catalog/file/get/5882629ae4b0dc04318b6de2/?name=Hars1998Nav_browse.jpg Browse graphic of the tracklines of the multibeam survey. JPEG Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4095 Butman, Bradford Danforth, W.W. Knowles, S.C. May, Brian Serrett, Laurie 2002 Open-File Report 00-503 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/of/2000/of00-503/ Bradford Butman 2002 Fact Sheet FS-001-02 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/fs/2002/fs001-02/ Butman, Bradford Middleton, T.J. Thieler, E.R. Schwab, W.C. 2003 Open-File Report 03-372 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/of/2003/of03-372/ Butman, Bradford Alexander, P. Soupy Harris, C.K. Traykovski, P.A. ten Brink, M.B. Lightsom, F.S. Martini, M.A. 2003 Open-File Report 02-217 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/of/2002/of02-217/ Clarke, J.H. 1998 New Brunswick, Canada Ocean Mapping Group, University of New Brunswick http://www.omg.unb.ca/~jhc/SwathEd.html All navigation data were processed in the same manner. This shapefile contains edited tracklines for the 1998 multibeam survey of the Historic Area Remediation Site. Other datasets from the 1998 HARS survey may be found in Butman and others (2017) (see larger work citation). These data were navigated with a Differential Global Positioning System (DGPS) which is typically accurate to +/- 3 meters, horizontally. To qualitatively assess the horizontal accuracy of the three HARS surveys, the locations of 23 distinct features on the sea floor identified in the 1996, 1998, and 2000 shaded-relief images were compared. Offsets of features in the 1996 survey compared to the 1998 survey were typically 5 m or less, as expected when navigating with DGPS. Offsets of features in the 2000 survey compared to the 1998 survey were 10-20 m and to the north or south, the along-track direction of the survey. For 18 of the 23 features in the 2000 survey, offsets were to the north compared to the 1998 survey when the track in 2000 was to the south, and offsets were to the south compared to the 1998 survey when the track in 2000 was to the north. The offsets of the remaining 5 features, all surveyed on Julian Day 115, were in the direction of the survey track in 2000. The HARS surveys were run in a Zamboni pattern which resulted in blocks of adjacent survey lines running in the same direction; thus consistent offsets appear to shift these blocks north or south depending on the direction the lines were run. The cause of the offsets in the 2000 survey is unknown and no correction has been made for them. Canadian Hydrographic Service William W. Danforth John E. Hughes Clarke Unpublished Material disc 19981030 19981104 ground condition none The multibeam data were collected with a Simrad EM1000 multibeam echosounder mounted on the Canadian Coast Guard ship Frederick G. Creed. The multibeam system utilizes 60 electronically-aimed receive beams spaced at intervals of 2.5 degrees that insonify a strip of sea floor up to 7.5 times the water depth. The horizontal resolution of the beam on the sea floor is approximately 10 % of the water depth. Vertical resolution is approximately 1 % of the water depth. Data were collected along tracklines spaced 5-7 times the water depth apart at a speed of 10-14 knots. The HARS was surveyed in a Zamboni pattern (for efficient turns at high speed) with lines running north-south. The Zamboni pattern yields blocks of southward-run lines adjacent to blocks of northward-run lines. The frequency of the sonar was 95 kHz. Sound velocity profiles were obtained and input into the Simrad processing system to correct for refraction. Navigation was by means of differential GPS. Operation of the Simrad EM1000 was carried out by hydrographers of the Canadian Hydrographic Service. The data were collected on Woods Hole Coastal and Marine Science Center field activity 1998-015-FA (https://cmgds.marine.usgs.gov/fan_info.php?fa=1998-015-FA). A suite of processing software (called SwathEd) (Clarke, 1998; see cross reference), developed by the Ocean Mapping Group at the University of New Brunswick, Canada, was used to process the multibeam and navigation data. Navigation data were edited on-screen using the SwathEd routine jview to remove undesirable points, including turns at the ends of survey lines. Jview also rejects stray GPS fixes outside of the survey area, as set by the operator (see process steps for bathymetry in larger work citation). 1998 U.S. Geological Survey William W. Danforth mailing and physical address

Woods Hole Coastal and Marine Science Center

384 Woods Hole Road

Woods Hole MA 02543 USA 508-548-8700 x2274 bdanforth@usgs.gov 1. ASCII navigation data collected by the DGPS receiver was reformatted to CSV (comma separated value) format using the UNIX awk utility. Point spacing along-track is defined by time. Navigation fixes are recorded at a 1-second interval for this trackline file. 2. Import the CSV file as points into ArcGIS using the Import XY data under the tools menu. 3. Export the point data to a shapefile by right clicking on the point data in the data view window and selecting the Export Data function. 4. Reformat the point shapefile into a line shapefile using the VAC Extras tool -> FeatConv -> Points to line v2 2010 U.S. Geological Survey William W. Danforth mailing and physical address

Woods Hole Coastal and Marine Science Center

384 Woods Hole Road

Woods Hole MA 02543 USA 508-548-8700 x2274 bdanforth@usgs.gov USGS Thesaurus keywords added to the keyword section. 20180720 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 Added keywords section with USGS persistent identifier as theme keyword. 20200807 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 85 0.000001 0.000001 Decimal degrees D_WGS_1984 WGS_1984 6378137.000000 298.257224 Hars1998Nav shapefile of tracklines for 1998 multibeam survey of the Historic Area Remediation Site USGS FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. LineNum Trackline number assigned by USGS USGS 250 2261 line number Lon Longitude at start of line USGS -73.899978 -73.816747 decimal degrees Lat Latitude at start of line USGS 40.434098 40.43592 decimal degrees Year Year at start of line USGS 1998 1998 calendar year JulianDay Julian Day, the integer number representing the interval of time in days since January 1 of the year of collection USGS 303 308 Julian day Hour Hour at the start of line (in GMT) USGS 0 23 hour Min Minute at the start of line (in GMT) USGS 0 59 minute Sec Second at the start of line (in GMT) USGS 0.01 59.7 second The navigation polyline shapefile records the trackline followed by the Canadian Coast Guard ship Frederick G. Creed in the 1998 survey of the Historic Area Remediation Site. The attributes are the USGS assigned line number and the latitude, longitude, and time (year, Julian day, hour, minute, second) at start of line. The 1998 HARS survey was assigned a block of line numbers beginning with 250 and another beginning with 2200. U.S. Geological Survey U.S. Geological Survey - ScienceBase mailing and physical address

Denver Federal Center

Building 810

Mail Stop 302

Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov Hars1998Nav.zip: contains Hars1998Nav.shp and other files associated with a shapefile, browse graphic, and the FGDC-compliant metadata (CSDGM format). Neither the U.S. Government, the Department of the Interior, nor the U.S. Geological Survey, nor the U.S. Army Corps of Engineers, 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 USGS 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. Shapefile ArcGIS 9.3 Esri shapefile Esri shapefile of navigation tracklines and associated metadata from a multibeam survey of the Historic Area Remediation Site carried out in 1998, compressed in a zip file zip 1 https://www.sciencebase.gov/catalog/file/get/5882629ae4b0dc04318b6de2/?name=Hars1998Nav.zip https://www.sciencebase.gov/catalog/file/get/5882629ae4b0dc04318b6de2 https://www.sciencebase.gov/catalog/item/5882629ae4b0dc04318b6de2 The network resources offer the options of downloading all the files, individual files, or accessing the landing page of the data. none The shapefile of navigation is compressed into a zip file (Hars1998Nav.zip). To use these data, the user must have software capable of uncompressing the zip file and ArcGIS or another GIS application package capable of viewing the data. 20200807 U.S. Geological Survey Bradford Butman mailing and physical address

Woods Hole Coastal and Marine Science Center

384 Woods Hole Road

Woods Hole MA 02543 USA 508-548-8700 x2212 bbutman@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time