In 2002 the CESAR consortium was founded by eight Dutch institutes that agreed to focus their atmospheric research at Cabauw. The Ruisdael observatory was established in 2018. Most CESAR partners now have joined the Ruisdael observatory.
The CESAR database portal ( and the CESAR Observatory website ( are no longer maintained. A static minimized version of the two websites can be viewed via the links below. Both URL’s are maintained and are directed now to this landing page on the Ruisdael Observatory webportal.
If you have any questions related to the CESAR database and/or the CESAR Observatory website please contact KNMI (

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