Best practise to iterate over all hindcastDates of several hindcastYears for CMA
Info |
---|
|
Info |
---|
for hindcastYear in hindcastYears |
Web-API examples:
A CMA reforecast request for all the available hindcastDates
Info |
---|
Please note:
|
Code Block | ||
---|---|---|
| ||
#!/usr/bin/env python
import calendar
from ecmwfapi import ECMWFDataServer
server = ECMWFDataServer()
origin = "babj"
modelVersionDate = "2014-05-01"
def retrieve_cma_reforecast():
"""
A function to demonstrate how to iterate efficiently over all hindcastYears, hindcastMonths etc
for a particular cma_reforecast_request.
Change the variables below to adapt the iteration to your needs
"""
hindcastYearStart = 1994
hindcastYearEnd = 2014
hindcastMonthStart = 1
hindcastMonthEnd = 12
for hindcastYear in list(range(hindcastYearStart, hindcastYearEnd + 1)):
|
Table of Contents
*******************************************This page is under construction!*****************
...
Info | ||
---|---|---|
| ||
To help users to improve S2S CMA MARS requests performance via the WebAPI
|
How the S2S data is organised in general in MARS?
...
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)
- levels (for pl or pt)
- parameters
- levels (for pl or pt)
- members (for perturbed forecast)
- time-steps
- HindcastDates (2014-01-01 or 2014-01-02 or 2014-01-03, ...)
- type of level (single level or pressure level or potential temperature)
- type of data (control forecast or perturbed forecast)
- realtime or reforecast
...
What would be the natural way to group requests?
Info |
---|
Following the previous paragraph, the natural way to group requests would be:
|
What is the best approach to loop over several HindcastDates for a CMA request?
...
title | The main idea in brief: |
---|
...
What is the best approach to get all HindcastDays for several HindcastYears ?
The best approach is to iterate over the Hyears you wish. For each Hyear iterate over all Hmonths and for each Hmonth iterate over all its Hdays.
Info | ||
---|---|---|
| ||
for HindcastYear in HindcastYears |
An example to request Control forecast, sfc, for HindcastYears 2010 to 2014 for 2 HindcastMonths (eg April and June)
Info | ||
---|---|---|
| ||
for HindcastYear from 2010 to 2014 |
A Control forecast, sfc, S2S-request example
Code Block | ||
---|---|---|
| ||
#!/usr/bin/env python from ecmwfapi import ECMWFDataServer server = ECMWFDataServer() hindcastDate, target) def cma_reforecast_request(hindcastDate, target): """ A CMA reforecast request. Change the keywords below to adapt it to your needs. """ server.retrieve({ "class": "s2", "dataset": "s2s", "date": "2014-05-01"modelVersionDate, "expver": "prod", "hdate": HindcastDatehindcastDate, (ie the selected HindcastDate eg "2014-04-01"), "levtype": "sfc", "origin": "babj"origin, "param": "165/166", "step": "024/to/1440/by/24", "stream": "enfh", "target": target, "time": "CHANGEME00", "timenumber": "001/2/3", "type": "cfpf", }) if __name__ == '__main__': retrieve_cma_reforecast() |
...
Useful links
Info |
---|
...