http://www.dosits.org/gallery/tech/osf/es1.htm

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http//www.dosits.org/gallery/tech/osf/es1.htm
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in each picture, the boat (in blue) is using an
echo sounder to image the ocean floor. On the
left is a single beam echo sounder, which only
images a circle of the seafloor (in red). On the
right is a multibeam echo sounder that observes a
much larger portion of the seafloor (line in
red). Photo Courtesy of NOAA Ocean Explorer.
http//www.dosits.org/gallery/tech/osf/es1.htm
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Multibeam bathymetric image of western Browns
Bank, western Scotian Shelf. Photo Courtesy of
Gordon Fader, Geological Survey of Canada
(Atlantic) and the Canadian Hydrographic Service.
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Seafloor Mapping - Sidescan Sonar
http//woodshole.er.usgs.gov/operations/sfmapping/
hydrophone.htm
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http//woodshole.er.usgs.gov/operations/sfmapping/
hydrophone.htm
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Seismic Reflection Profiles
Fig. 3.3a
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