Hierarchical clustering of historic sound speed profiles

Roger Meredith, Bryan Mensi, Marlin Gendron
2008 OCEANS 2008  
Categorizing historical sound speed profiles stems from the desire to map spatial and temporal variability. Sound speed variability correlates with environmental phenomena and is an indicator of changes in sonar performance. Sound speed maps will assist in planning more efficient environmental survey operations such as conductivity, temperature, depth (CTD) collections. Intrinsic profile attributes estimated directly from the profile, such as the mean, variance, and derivative values, are used
more » ... e values, are used in the clustering process separately or in conjunction with extrinsic attributes such as location and ocean floor depth. Examples are used to demonstrate that the underlying spatial boundaries of the cluster groupings identify regions where sound speed profiles are consistent. The process is easily tailored to multiple clustering based upon the spatial and temporal scales of interest or on generic properties of the individual profile. The sensitivity of the cluster boundaries and group statistics to the addition of new profiles, or to changes in temporal and spatial scale, defines a new environmental characterization. U.S. Government work not protected by U.S. copyright Report Documentation Page Form Approved OMB No. 0704-0188 Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.
doi:10.1109/oceans.2008.5151806 fatcat:gum5obodsnhrdo7yyprrne4sxq