Bathymetric sonar data acquisition H10993: Bathymetric sonar data were collected from launches 1005 and 1014 of the NOAA Ship Thomas Jefferson, S-222. Launch 1005 used a RESON SeaBat 8101 multibeam sonar system and Launch 1014 used a RESON SeaBat 8125 multibeam sonar system. Positioning and attitude information on both launches were determined using Applanix TSS POS/MV 320 (version 2) GPS aided inertial navigation systems. On Launch 1014, an Odom Hydrographic Digibar Pro sound velocimeter was used to continually measure changes in sound-velocity near the sea surface. Sonar data were collected along east-west oriented survey lines spaced between approximately 15 and 50 meters apart, providing 100 percent coverage of the seafloor. Data collected along several north-south oriented survey lines were used for survey line junction analyses subsequent to the application of tide corrections. To review more detailed information concerning data acquisition equipment, configuration, and settings on launches 1005 and 1014, please refer to the descriptive report for the survey H10993, which can be accessed online by visiting
http://www.ngdc.noaa.gov/mgg/bathymetry/hydro.html and entering "H10993" into the "Survey" section of the "Text search of NOS data and products" dialog. Bathymetric sonar data acquisition 06012: Bathymetric sonar data were collected using a Systems Engineering and Assessment (SEA), Ltd. SWATHPlus-M (234 kHz) interferometric sonar system. The SWATHPlus transducers were mounted on a rigid pole, approximately 2.6 m below the water line, along the starboard side of the R/V Megan T. Miller of Port Jefferson, NY. An International Industries, Inc. TSS DMS 2-05 inertial-motion unit, mounted directly above the SWATHPlus transducers, measured vertical displacement (heave) and attitude (pitch and roll) of the vessel during data acquisition. Heading was determined using an Ashtech ADU2 for lines l1f1-l99f1, and a KVH compass (with processor calculated declination +15.583 to be applied during post-processing) for lines l99f2-end of survey. 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 approximately every two hours. SWATHPlus acquisition software was used to control the transducers and digitally log sonar data across a 200 m swath in the SWATHPlus .SXR format. To obtain 100 percent coverage of the seafloor, sonar data were collected along northwest-southeast and north-south oriented survey lines that were spaced approximately 100 or 200 meters apart. Data collected along several northeast-southwest and east-west oriented survey lines were used for survey line junction analyses subsequent to the application of tide corrections. The R/V Megan T. Miller maintained an average speed of 5 knots during survey operations. Bathymetric sonar data acquisition 07001: Bathymetric sonar data were collected using a Systems Engineering and Assessment, Ltd. SWATHPlus-M (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 inertial-motion unit, 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 approximately every two hours. SWATHPlus acquisition software was used to control the transducers and digitally log sonar data across a 150 m swath in the SWATHPlus .SXR format. To obtain 100 percent coverage of the seafloor, sonar data were collected along northwest-southeast and north-south oriented survey lines that were spaced approximately 100 m apart. Data collected along several northeast-southwest and east-west oriented survey lines were used for survey line junction analyses subsequent to the application of tide corrections. The R/V Rafael maintained an average speed of 5 knots during survey operations.
