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To help users to improve S2S CMA MARS requests performance via the WebAPIIf a user is interested only on z500, he may request more HindcastDates in one go, since the overall request will not be so big. A good understanding of the MARS efficiency issues is essential especially for users that are interested in downloading large amounts of data.
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How the S2S data is organised in MARS?since the overall request will not be so big.
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In general it is organised, as a huge tree, with the indentation below, showing different levels down that tree: - centre (CMA, ECMWF, NCEP, JMA, ...)
- realtime or reforecast
- type of data (control forecast or perturbed forecast)
- type of level (single level or pressure level or potential temperature)
- HindcastDates (2014-01-01 or 2014-01-02 or 2014-01-03, ...)
- time-steps
- members (for perturbed forecast)
The idea is to request as much data as possible from the same tape file, all time-steps, all members, all parameters for a type of level, a type, a HindcastDate
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If the request is "small" you may request more HindcastDates in one go.
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