European Directory of Marine Environmental Data (EDMED)

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Data set name

Permanent Service for Mean Sea Level (PSMSL) Dataset (1807-)

Data holding centrePermanent Service for Mean Sea Level
CountryUnited Kingdom  United Kingdom
ProjectPermanent Service for Mean Sea Level (PSMSL)(PSMSL)
Time periodFrom 1807 onwards
Geographical area



Sea level


Sea level recorders


The database of the Permanent Service for Mean Sea Level (PSMSL) contains over 50000 station-years of monthly and annual mean values of sea level from over 1800 tide gauge stations around the world. The PSMSL receives monthly and annual values of sea level from almost 200 national authorities responsible for sea level monitoring in each country or region. Data from each station are entered directly as received from the authority into the PSMSL raw data file for that station (usually called the 'METRIC' file in PSMSL publications). The monthly and annual means so entered for any one year are necessarily required to be measured to a common datum, although, at this stage, datum continuity between years is not essential. While PSMSL makes every attempt to spot inconsistent or erroneous data, the responsibility for the monthly and annual means entered into the METRIC files in this way is entirely that of the supplying authority. In order to construct time series of sea level measurements at each station, the monthly and annual means have to be reduced to a common datum. This reduction is performed by the PSMSL making use of the tide gauge datum history provided by the supplying authority. To date, approximately two thirds of the stations in the PSMSL database have had their data adjusted in this way, forming the 'REVISED LOCAL REFERENCE' (or 'RLR') data set. For scientific purposes, the RLR data set is normally superior to the METRIC, although the latter, which contains the total PSMSL data holdings, can also be analysed bearing in mind the above datum continuity considerations. The contents of the PSMSL data set are described in its web site ( Copies of its data set can be obtained from this web site and on CD. The PSMSL will be pleased to provide data, information and advice to all organisations and individuals interested in measuring and analyzing sea level changes.

OriginatorsPermanent Service for Mean Sea Level

Woodworth, P.L., and Player, R. (2003) The Permanent Service for Mean Sea Level: an update to the 21st century., Journal of Coastal Research, 19(2): 287-295.

Data web site
OrganisationPermanent Service for Mean Sea Level
AvailabilityUnrestricted; academic
ContactThe Director

Permanent Service for Mean Sea Level
National Oceanography Centre, Joseph Proudman Building
L3 5DA
United Kingdom

Telephone+44 151 7954800
Collating centreBritish Oceanographic Data Centre
Local identifier1052001
Global identifier681
Last revised2009-10-15