NOAA's NOS/NCCOS/CCMA Biogeography Branch, in collaboration with NOAA's Chesapeake Bay Office and other territory and federal partners, acquired interferometric backscatter and bathymetry data in Puerto Rico from 04/07/2009 to 04/21/2009. Data were acquired with a pole-mounted Teledyne Benthos C3D-LPM interferometric SoNAR (200 kHz) and processed using CARIS HIPS and SIPS v7.0 software. The backscatter data were geometrically and radiometrically corrected using the Geocoder module in Hypack 2009. Acoustic backscatter mosaics are an important piece of information when characterizing surficial seafloor features and delineating benthic habitats.
These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data have been used by NOAA, no warranty, expressed or implied, is made by NOAA as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by NOAA in the use of these data or related materials.
RMB 1 41815.565 2 4 1881 200 1500.00 18490
The correct sound velocity values at the sonar head were located in the look up server log text file for each day. An example of a server log is shown below:
Tue Apr 07 15:53:40 2009:Ping# 48889 S/ch 1902 Rng(m)49.9 Lty 592.017889 SpeedSound=1540.562256 Tue Apr 07 15:53:40 2009:Ping# 48890 S/ch 1902 Rng(m)49.9 Lty 650.454044 SpeedSound=1540.562256 Tue Apr 07 15:53:40 2009:Ping# 48891 S/ch 1902 Rng(m)49.9 Lty 599.314928 SpeedSound=1540.562256
The SV values in the server log, however, were 1 m/s too slow (due to a calibration issue). Consequently, a value of 1 m/s was added to each SV value in the server log files before they were used to replace the SV values in the HSX files (using a custom script built by NOAA's Biogeography Bracnch). In all, SV values in 662 HSX lines were replaced using SV values from 12 separate server log files. These adjusted lines were then imported into CARIS v7.0.