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Layer represents any geographic location at which tidal (water level)
observations have been collected and verified, including stations presently collecting observations. "Tide" is defined as the periodic rise and fall of a body of water resulting from gravitational interactions between Sun, Moon, and Earth. "Water level" is defined as the height of the water surface relative to a specific datum (reference elevation). Most stations with water level observations provide readings every 6 minutes. CO-OPS measures water levels at over 200 stations along the coast of the United States and its territories and around the Great Lakes. More information can be found at http://tidesandcurrents.noaa.gov/stations.html?type=Historic+Water+Levels |