How is sea level measured?

In the UK, the National Tidal and Sea Level Facility (NTSLF), based at the Proudman Oceanographic Laboratory in Liverpool, is responsible for predicting tides and measuring changes in sea level. They are also responsible for calculating the heights of possible storm surges around the UK.

http://www.pol.ac.uk/ntslf/

Satellites are now helping to map changes in global sea level more accurately:

http://news.bbc.co.uk/1/hi/sci/tech/7533921.stm

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