This shapefile includes trackline navigation from all the interferometric sonar data that was collected within the survey area; however only quality bathymetric soundings along the main survey lines were included in the final bathymetry grid included on this report. Bathymetric and backscatter data along the tielines were not included in the final bathymetry grid and backscatter image.
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The SWATHplus transducers were mounted on a rigid, vertical pole, at the bow of the R/V Rafael, approximately 0.5 meters below the water line. Navigation antennas (one Differential Global Positioning System (DGPS) antenna and two Real-Time Kinematic (RTK) GPS antennas) were mounted on a horizontal crossbar atop the vertical transducer mount pole. The horizontal positions for soundings were acquired with an Octopus F180 Attitude and Positioning System integrated with a Novatel DGPS. Horizontal sounding positions were recorded to raw sonar data files (SXR) via SWATHplus acquisition software (version 3.06.05.00). Position data from an Ashtech Surveyor RTK GPS, a Novatel DL-V3 RTK GPS, and an CSI LGBX Pro DGP were recorded by HYPACK survey software to HYPACK raw files. A conservative estimate of the positional accuracy of the CSI LGBX Pro DGPS unit is ± 2 meters.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
The source information was incomplete and had to be modified to meet the standard. Assumed to be USGS.
Publication_Date: unknown
Title: Information unavailable from original metadata.
Type_of_Source_Media: Information unavailable from original metadata.
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20090928
Ending_Date: 20091023
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: Information unavailable from original metadata.
Source_Contribution:
Bathymetric and backscatter data were collected using a Systems Engineering and Assessment, Ltd. SWATHplus (234 kHz) interferometric sonar system. The SWATHplus transducers were mounted on a rigid pole, approximately 0.5 m below the water line, from the bow of the of the R/V Rafael of Woods Hole, MA. A CodaOctopus F-180 Attitude and Positioning System, mounted directly above the SWATHplus transducers, measured vertical displacement (heave) and attitude (pitch and roll) of the vessel during data acquisition. An Applied Microsystems Ltd. Micro SV sound velocimeter, mounted adjacent to the SWATHplus transducers, continually measured changes in sound-velocity near the sea surface, and a hand-casted, Applied MicroSystems SV Plus sound velocimeter was used to collect sound-velocity profiles of the entire water column at least once each survey day. SWATHplus acquisition software was used to control the transducers and digitally log sonar data across an 80 m swath in the SWATHplus SXR format. An RTK-corrected GPS signal was transmitted to a beacon aboard the survey vessel once every second from a base station established by USGS personnel in the inner harbor. RTK vertical heights were used to correct tidal offsets during post-processing. To obtain 100 percent coverage of the seafloor, survey lines were spaced approximately 30 m apart. The R/V Rafael maintained an average speed of 5 knots during survey operations. The trackline for survey line l147f1 shows a loop during which interferometric data was still collected. Interferometric sounding and backscatter data for this loop was excluded from bathymetry and backscatter datasets.
Process_Step:
Process_Description:
Raw to Processed Conversion: Survey navigation information is stored within each raw (SXR) data file. Each raw SWATHplus bathymetric sonar file (SXR) was converted to a SWATHplus processed file (SXP) using SEA SWATHplus Swath Processor (ver. 3.06.05.00).
Process_Date: 2009
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Aaron Turecek
Contact_Organization: U.S. Geological Survey
Contact_Position: Geographer
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2230
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: aturecek@usgs.gov
Process_Step:
Process_Description:
CARIS Processing: A new Computer Aided Resource Information System (CARIS) Hydrographic Information Processing System (HIPS) project (ver. 6.1) was created with projection information set to Universal Transverse Mercator (UTM) Zone 19, WGS84. Each SWATHplus processed file (SXP) was imported to the new CARIS project using the Import/Conversion Wizard. Navigation was checked and edited as needed using the Navigation Editor tool.
Process_Date: 2009
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Aaron Turecek
Contact_Organization: U.S. Geological Survey
Contact_Position: Geographer
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2230
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: aturecek@usgs.gov
Process_Step:
Process_Description:
A series of Perl and AWK programming scripts were used to extract and subsample the navigation fixes stored in the CARIS HIPS database. The processing flow for this step follows:
A.) Extract navigation for each line in CARIS HDCS directory using Perl script do_CARIS_nav2.pl (which runs the CARIS program printfnav for all the lines in the HDCS dir) and the grep statement below. (Extracted navigation file is tab-delimited in format YYYY-JD HH:MM:SS:FFF DD.LAT DD.LONG SSSSS_VVVVV_YYYY-JD_LLLL AR where YYYY=year, JD=Julian Day, HH=hour, MM=minute, SS=seconds, FFF=fractions of a second, DD.LAT=latitude in decimal degrees, DD.LONG=longitude in decimal degrees, SSSSS=survey name, VVVVV=vessel name, LLLL=linename, AR=accepted or rejected navigation fix) > grep Accepted combined.txt > outputfile
B.) The files extracted from CARIS HIPS have 4-5 navigation fixes per second. Each file was subsampled to 1 fix per second by using AWK (see code below) to remove the fractions-of-a-second from the time column then grabbing the first occurrence of each second. > awk '{print $1" "substr($2,1,8)" "$3" "$4" "$5}' 2.ss_combined_grep.txt | awk '$2 != prev { print; prev = $2 }' > 3.ss_nav_awked.txt.
C.) Checked that there were no additional spurious fixes outside the survey area using another series of AWK code (see code below), and reformatted for conversion from comma separated value (CSV) data to ESRI point feature class > awk -F" " '{if(substr($4,1,3)!="-70") print $0}' 3.ss_nav_awked.txt > awk -F" " '{if(substr($3,1,1)!="4") print $0}' 3.ss_nav_awked.txt > awk -f reformat_CARIS2Arc_SS.awk 3.ss_nav_awked.txt > SS_bathyNAV_ofr.csv
Process_Date: 2009
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Aaron Turecek
Contact_Organization: U.S. Geological Survey
Contact_Position: Geographer
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2230
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: aturecek@usgs.gov
Process_Step:
Process_Description:
In ArcMap (version 9.3), navigation text file was added as an event theme (Tools/AddXY) with a defined coordinate system of UTM, Zone 19, WGS84, and then converted to a point shapefile.
Process_Date: 2009
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Aaron Turecek
Contact_Organization: U.S. Geological Survey
Contact_Position: Geographer
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2230
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: aturecek@usgs.gov
Process_Step:
Process_Description:
Within ArcMap (version 9.3) XToolsPro (version 5.3.0) was used to convert the navigation point file to a trackline polyline shapefile. The trackline shapefile was checked for spurious fixes. The following fields were added to the polyline shapefile using XToolsPro: FILENAME, YEAR, JULDAY, SURVEYID, DEVICEID, VEHICLEID, LENGTH. Fields were populated as: FILENAME = linename, YEAR = year of survey, JULDAY = Julian day surveyed (via tabular join with nav point shapefile), SURVEYID = USGS survey number, DEVICEID = device used for collection, VEHICLEID = survey vessel, LENGTH = length of each survey line calculated in kilometers (Calculate geometry at attribute table).
Process_Date: 2009
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Aaron Turecek
Contact_Organization: U.S. Geological Survey
Contact_Position: Geographer
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2230
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: aturecek@usgs.gov
Process_Step:
Process_Description:
Tracklines were converted from UTM projection to Geographic (WGS 1984) within Arcmap (version 9.3) using ArcToolBox/Data Management Tools/Projections and Transformations/Feature/Project.
Process_Date: 2010
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Aaron Turecek
Contact_Organization: U.S. Geological Survey
Contact_Position: Geographer
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: (508) 548-8700 x2230
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: aturecek@usgs.gov
Process_Step:
Process_Description:
Edits to the metadata were made to fix any errors that MP v 2.9.32 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). Fixed URL in abstract. The source information was incomplete and had to be modified to meet the standard. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent.
Process_Date: 20160414
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description: USGS Thesaurus keywords added to the keyword section.
Process_Date: 20180720
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description: Crossref DOI link was added as the first link in the metadata.
Process_Date: 20191118
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description:
Added keywords section with USGS persistent identifier as theme keyword.
Process_Date: 20200908
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
