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We are pleased to announce that the new MARS client with MIR, the new interpolation library replacing EMOSLIB, is now considered ready to become the default at ECMWF. This new version has endured months of extensive tests by many users to ensure a smooth transition. This change of the default MARS client is planned for 29 January 2019.

The old MARS/EMOSLIB would still be accessible with:

mars -e

or, if using the WebAPI, with the keyword:


You can find some more information about this in our User Documentation wiki space, including the main differences and known issues:

This page will be updated to reflect any updates relevant to this update and the new MARS/MIR client. You may want to "watch" this page to be notified about those updates.

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