How Do We Map the Sea Floor?
It is easy to see what is on land.
It is much harder to look at the bottoms of lakes, rivers, canals, and oceans.
To make a map of the sea floor, a ship goes out and does a special survey called a hydrographic survey.
Did you know?
NOAA operates four full-time hydrographic survey ships and several smaller boats.
The NOAA ships Rainier and Fairweather survey in Alaska and the Pacific Ocean, and the ships Rude (say Rudy) and Thomas Jefferson survey in the Atlantic Ocean on the East Coast.