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In general it is organised, as a huge tree, with the indentation below, showing different levels down that tree:
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The idea is to request as much data as possible from the same tape file . The natural way to group requests would be: Note: 'all' means 'all' that the user wants. It doesn't have to be all parameters. |
Web-API examples:
Example 1: A UERRA
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SMHI pressure level request
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You can use the variable 'target' to organise the requested data in separate files if you wish. |
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#!/usr/bin/env python import calendar from ecmwfapi import ECMWFDataServer server = ECMWFDataServer() def retrieve_uerra_eswi(): """ A function to demonstrate how to iterate efficiently over several years and months etc for a particular UERRA request for origin SHMISMHI. Change the variables below to adapt the iteration to your needs. You can use the variable 'target' to organise the requested data in files as you wish. In the example below the data are organised in files per month. (eg "uerra_eswi_daily_201510.grb") """ yearStart = 2008 yearEnd = 2009 monthStart = 1 monthEnd = 12 for year in list(range(yearStart, yearEnd + 1)): for month in list(range(monthStart, monthEnd + 1)): startDate = '%04d%02d%02d' % (year, month, 1) numberOfDays = calendar.monthrange(year, month)[1] lastDate = '%04d%02d%02d' % (year, month, numberOfDays) target = "uerra_eswi_daily_%04d%02d.grb" % (year, month) requestDates = (startDate + "/TO/" + lastDate) uerra_eswi_request(requestDates, target) def uerra_eswi_request(requestDates, target): """ A UERRA request for origin SHMISMHI, for analysis pressure level data. Change the keywords below to adapt it to your needs. (eg to add or to remove levels, parameters, times etc) Request cost per day is XXXX fields, XXXX Mbytes """ server.retrieve({ "class": "ur", "stream": "oper", "type": "an", "dataset": "uerra", "origin" : "eswi", "date": requestDates, "expver": "prod", "levtype": "pl", "levelist": "1000", "param": "130.128", "target": target, "time": "00/06/12/18" }) if __name__ == '__main__': retrieve_uerra_eswi() |
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