When I was at the Dam I recorded the gauge (water elevation) every hour into a weather book. When I was in the Navy I dropped a heavy weighted rocket over the side of the ship twice a day to record the water temperature at particular depths at a particular places in the ocean (Latitude and Longitude). The rocket had a crank and cable to bring it back up.
Sometime during the 1980's the government hired college students to enter all the data into computers from the oceans; from all the ships traveling over the seas. They also entered all the data into computers from the weather books from all the lock and dams times.
Today we have satellites and GPS to record all the data.
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