Versions Compared

Old Version 18

changes.mady.by.user Manuel Fuentes

Saved on

compared with

New Version 19

changes.mady.by.user Manuel Fuentes

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

Info

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


(lightbulb) 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

What would be the natural way to group requests?

Info

Following the previous paragraph,  the natural way to group requests would be:
all parameters, all levels, all members, all time-steps for 1 HindcastDate.

(warning) Note the following:

  1. 'all' means 'all' that the user wants. It doesn't have to be all parameters.
  2. If a user is interested only on z500,  he may request more HindcastDates in one go, since the overall request will not be so big.

...

Info
titleThe main idea in brief:
for HindcastDate in HindcastDate-list (eg, 2010-03-01 to 2010-03-31)
     S2S-request(HindcastDate)


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
titleThe main idea in brief:
for HindcastYear in HindcastYears 
    for HindcastMonth in HindcastYear
        for HindcastDay in HindcastMonth
             HindcastDate = HindcastYear-HindcastMonth-HindcastDays
                 s2SS2S-request(HindcastDate)

An example to request Control forecast, single level, for HindcastYears 2010 to 2014 for 2 HindcastMonths  (eg April and June)

Info
titleThe main idea in brief:
for each HindcastYear from 2010 to 2014
    for HindcastMonth in 04, 06
        for HindcastDay in HindcastMonth
             HindcastDate = HindcastYear-HindcastMonth-HindcastDay
             s2SS2S-request(HindcastDate)