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This documentation starts with an overview of ECMWF's activity, as it is necessary to know the kind of data available from a meteorological archive. In section MARS content the most common products are listed, followed by details on the data formats used.
Section Web-MARS gives an overview on Web-MARS, the Web interface to MARS, which is not only the best documentation of the archive content but also a useful tool when retrieving data.
Section MARS command and request syntax follows with a description of the MARS command and explains the pseudo-meteorological vocabulary, i.e. the MARS language. It introduces the MARS request format and syntax. Then, it focuses on the structure of retrieve requests. MARS keywords lists keywords relevant to data retrieval and the most common products are reviewed, providing the MARS terms needed to name each data set.
Later on, the MARS architecture is described: what are the clients and servers. This enables users to understand the request execution of a MARS request: what is happening behind the scenes from the user's point of view.
Within all the above concepts, section Retrieve focuses on aspects to bear in mind while retrieving data from MARS, e.g. request scheduling in the main archive, post-processing capabilities available, hints to maximise retrieval efficiency and trouble shooting guidelines.
The following sections explain how to list archived data (section List) and how to carry out computations in MARS.
The remaining part presents a selection of example requests and answers to some Frequently Asked Questions (FAQ)
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