Title :
Improvement of the legibility of bathymetric pictures with a monodimensional wavelet packet filter
Author :
Quivouron, C. ; Quinquis, A. ; Voisset, M.
Author_Institution :
ENSIETA, Brest, France
Abstract :
The French Institute of Research for the Sea Exploitation (IFREMER) uses the multibeam sounder SIMRAD EM12 to build a morphological and sedimentary cartography of seafloors. Produced maps help geologists to understand the various processes that formed the lithosphere. A method to filter bathymetric data is given to improve the legibility of morphological maps of the seabed made from information collected by the sounder. After a pre-processing that eliminates unknown or unrealistic soundings, data are filtered to remove the artefacts brought about by incorrectly appreciated ship motion and also to minimize the noise effects, with a monodimensional wavelet packet filter
Keywords :
bathymetry; digital filters; oceanographic techniques; sonar imaging; Dual Multibeam Echo Sounder; IFREMER; SIMRAD EM12; bathymetric data filter; bathymetric picture improvements; monodimensional wavelet packet filter; morphological maps; multibeam sounder; noise effects; pre-processing; seabed; seafloor; sedimentary cartography; ship motion; Acoustic beams; Acoustic noise; Geology; Information filtering; Information filters; Interference; Marine vehicles; Sea floor; Signal processing; Wavelet packets;
Conference_Titel :
OCEANS, 2001. MTS/IEEE Conference and Exhibition
Conference_Location :
Honolulu, HI
Print_ISBN :
0-933957-28-9
DOI :
10.1109/OCEANS.2001.968079
