Data Centres and Networks

GTN-H is a gateway to a great number of global observing systems for hydrological data. You can find descriptions and links to all network partners of GTN-H and the hydrological data products developed under the cooperation of the network.



The global information system on water and agriculture of the United Nations‘ Food and Agricultural Organisation (FAO).

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The Global Groundwater Monitoring Network Portal gives insights into the availability of groundwater monitoring data across space and time.

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The Global Network of Isotopes in Precipitation and Rivers is a systematic collection of basic spatial data on the isotope content of precipitation across global scales.


Established in 1989, the Global Precipitation Climatology Center has been assigned by WMO to collect, quality assure, process and grid world-wide in-situ data of rain and snowfall measurements, collected by rain gauges.

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The Global Runoff Data Centre provides a unique collection of river discharge data collected at daily or monthly intervals from nearly 9000 stations in 157 countries.

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Within the framework of GEMS/Water (UNEP) the GEMS/Water Data Centre hosts the global water quality database GEMStat with monitoring data of more than 4000 stations in 75 countries.

Sustainable Development Goals:


The International Data Centre on Hydrology of Lakes and Reservoirs develops and updates an international database on hydrological regime of lakes and reservoirs.

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The International Soil Moisture Network is an international cooperation to establish and maintain a global in-situ soil moisture database.

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The member of the CNES/LEGOS have been involved in the development and design of space altimetry applications for around 20 years, as PI of Topex/Poseidon, ERS-1/2, Jason-1/2, Envisat, and the future Altika/Saral and SWOT missions.

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The National Snow and Ice Data Centre manages and distributes scientific data, creates tools for data access, supports data users, performs scientific research, and educates the public about the cryosphere.

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The World Glacier Monitoring Service (WGMS) collects standardized observations on changes in mass, volume, area and length of glaciers with time (glacier fluctuations), and space (glacier inventories).

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