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Table of Contents

How is the UERRA  data organised in MARS?

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In general it is organised, as a huge tree, with the indentation below, showing different levels down that tree:

  • origin and model (eg SHMI, Atmospheric model etc)
    • type of data (analysis, forecast, etc)
      • year
        • month
          • type of level (model level, pressure level, surface etc) 
            • dates, times, steps (for forecast type), levels (for non surface levels), parameters, members (for ensembles) (same tape file)(star)

What would be the natural way to group requests?

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The idea is to request as much data as possible from the same tape file (star) . The natural way to group requests would be:
all parameters, all levels, all time-steps for all dates of a month

(warning) Note: 'all' means 'all' that the user wants. It doesn't have to be all parameters.

Web-API examples:

Example 1: A UERRA SHMI pressure level request

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  • The objective of this example is to demonstrate how to iterate efficiently over some years, for a particular ERA interim, daily, pressure level request.
  • At this point you may wish to have a look on the  UERRA SHMI availability
  • The request below can be used as a starting point, however you need to keep in mind that you have to adapt it to your needseg to set the keyword, values according to your requirements (eg add or remove 'param', 'levtype', 'step' etc).
  • In this way you can extend this example to download a longer period or even the whole ERA interim dataset.

(smile) You can use the variable 'target' to organise the requested data in separate files if you wish.

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