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NGDC/MGG-Announcements: Bathymetry of Lake Michigan
LAKE MICHIGAN BATHYMETRY Bathymetry has been compiled using the entire array of good-quality historical hydrographic soundings collected in support of nautical charting over a 120 year period by the NOAA National Ocean ... about 2000m for the open lake and ranges from 200m to 600m for nearshore areas. Soundings collected since 1903 were already reduced to the Lake Michigan mean low water datum; these ...
www.ngdc.noaa.gov

NGDC/MGG-Announcements: US Coastal Relief Data on CD-ROM, DVD-ROM, or free for download
US Geological Survey 3-arc-second DEMs with a vast compilation of hydrographic soundings collected by the National Ocean Service and various academic institutions. Eight CD-ROMs are available ... product also includes auxiliary grids for non-land areas: a set containing the number of soundings encompassed by each cell and a set containing distances to the nearest original data for ...
www.ngdc.noaa.gov More from this site

Deepest Ocean - Challenger Deep
They Know? In 1984 the Japanese sent a highly specialized survey vessel out to the Marianas Trench and collected some data using a piece of equipment called a narrow, multi-beam echo sounder. What an echo sounder ... waves to be returned to the surface and determines the depth based on the rate of return. These soundings are plotted on a graph by a computer to make an "echo map" of the ocean bottom. ...
extremescience.com

Oceans Alive! | The Scientist at Sea | Remote Sensing
New satellites and new programs mean vast amounts of new data being collected. These data and their interpretation will help us to find important pieces of the puzzle that ... objects to track schools of fish, locate submerged submarines and map the ocean floor. Try taking ocean soundings yourself!
mos.org

ENN: Robot vehicle surveys deep sea off Pacific Northwest
On this first cruise, Sentry collected as many as 60 million individual soundings of seafloor depth in a single dive. Powered by more than 1,000 lithium-ion batteries-similar to those used in laptop computers, though adapted for extreme pressures, Sentry dove for as ...
enn.com