NOAA Hydrographic Surveying (IMAGE) NOAA Headquarters Caption NOAA uses echo-sounding technologies to measure water depths, find underwater physical features, and gather data on the characteristics of the seafloor. Credit NOAA Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.