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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:
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Best practise to iterate over all hindcastDates of several hindcastYears for ECMWF
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for hindcastYear in hindcastYears |
Web-API examples:
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To start writing your request you firstly need to know the model version date and the corresponding Hindcast Days you wish to retrieve. |
An ECMWF reforecast request for all the available hindcastDates
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#!/usr/bin/env python from ecmwfapi import ECMWFDataServer server = ECMWFDataServer() origin = "ecmf" modelVersionDate = "2015-12-03" hindcastDates = ["1995-12-03", "1996-12-03", "1997-12-03", "1998-12-03", "1999-12-03", "2000-12-03", "2001-12-03", "2002-12-03", "2003-12-03", "2004-12-03", "2005-12-03", "2006-12-03", "2007-12-03", "2008-12-03", "2009-12-03", "2010-12-03", "2011-12-03", "2012-12-03", "2013-12-03", "2014-12-03"] def retrieve_ECMWF_reforecast(): """ A function to demonstrate how to iterate efficiently over all hindcastDays hindcastDates for a particular ECMWF reforecast model version. Change the variables below to adapt the iteration to your needs """ #Please note that the "sfc" and "pl" requests below could run in parallel #Step 1: Get pressure level data pfplTarget = "%s_%s_%_%s.grb" % (origin, "pfpl", modelVersionDate) ECMWF_reforecast_pf_pl_request("/".join(hindcastDates), pfplTarget) #Step 2: Get surface data pfsfcTarget = "%s_%s_%s.grb" % (origin, "pfsfc", modelVersionDate) ECMWF_reforecast_pf_sfc_request("/".join(hindcastDates), pfsfcTarget) def ECMWF_reforecast_pf_pl_request(hindcastDate, target): """ A ECMWF reforecast, perturbed forecast, pressure level, request. The cost of this request is fields and Gbytes Change the keywords below to adapt it to your needs. """ server.retrieve({ "class": "s2", "dataset": "s2s", "date": modelVersionDate, "expver": "prod", "hdate": hindcastDates, "levtype": "pl", "levelist": "10/50/100/200/300/500/700/850/925/1000", "origin": origin, "param": "130/131/132/133/135/156", "step": "24/to/768/by/24", "stream": "enfh", "target": target, "time": "00", "number": "1/2/3/4", "type": "pf", }) def ECMWF_reforecast_pf_sfc_request(hindcastDate, target): """ A ECMWFreforecast, perturbed forecast, sfc request. The cost of this request is 383,040 fields and 7.1 GB Change the keywords below to adapt it to your needs. """ server.retrieve({ "class": "s2", "dataset": "s2s", "date": modelVersionDate, "expver": "prod", "hdate": hindcastDate, "levtype": "sfc", "origin": origin, "param": "1/33/34/59/121/122/134/136/146/147/151/165/166/167/168/169/175/176/177/179/180/181/235", "step": "24/to/744/by/24", "stream": "enfh", "target": target, "time": "00", "number": "1/2/3/4", "type": "pf", }) if __name__ == '__main__': retrieve_ECMWF_reforecast() |
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