[gradsusr] ECMWF Data

[Netanel_H]

Can be done by Curl, for example:
curl --range $startoffset-$endoffset
https://data.ecmwf.int/forecasts/20200202/00z/0p4-beta/oper/20200202000000-0h-oper-fc.grib2
--output <path/to/folder>

$startoffset and $endoffset are easy to be greped from index file

ב־ 02/02/22 17:43, ‏CW Weather כתב\ה:
>
> Hi Bill,
>
> Yes i've scrolled through the page and that's where I found out you
> can call for single parameters but through the bytes in the idx file,
> which is useless unless you use python i suspect.
>
>
> Thanks all the same,
>
>
> Stu
>
>
>
>
> On 02-02-2022 15:19, Bill Reilly wrote:
>
>> Hello:
>>
>> I had a look and tried using the data as well but had problems, so I
>> checked out the User Documentation page for this data:
>>
>> https://confluence.ecmwf.int/display/UDOC/ECMWF+Open+Data+-+Real+Time
>>
>> Maybe something on that page is useful to you.
>>
>> Bill
>>
>> --
>>
>> Bill Reilly
>>
>> (+34) 686-110-748
>>
>> bill at passageweather.com <mailto:bill at passageweather.com>
>> www.passageweather.com <http://www.passageweather.com>
>>
>> On 02/02/2022 11:49, CW Weather wrote:
>>>
>>> Hello all,
>>>
>>>
>>> ECMWF have made some data freely available on top of the WMO data
>>> sets. The link is here https://data.ecmwf.int/forecasts/. I have
>>> downloaded via wget for exmaple -
>>> https://data.ecmwf.int/forecasts/20220202/00z/0p4-beta/oper/20220202000000-6h-oper-fc.grib2
>>> and then run a simple perl command as follows;
>>>
>>> @ECHO Please wait, concetenating grb files...
>>> cat *.grb > ecmwf_grib.grib2
>>> @ECHO Please wait, creating ctl file...
>>> perl g2ctl.pl -verf ecmwf_grib.grib2 > ecmwf_grib.ctl
>>> @ECHO Please wait, creating idx file...
>>> gribmap -i ecmwf_grib.ctl -e
>>>
>>>
>>> but as you can see on the attached image the control file hasn't got
>>> the variable names or values correct and TP (total precip) isn't
>>> possible to fathom on the file. Ive managed to guess most variable
>>> like pressure, t2m wind ect.
>>>
>>>
>>> There is a way to download single variable per time step but you
>>> would have to input the length and/or bytes from the idx file for
>>> example - |wget https://data.ecmwf.int/forecasts
>>> <https://data.ecmwf.int/forecasts/20220202/00z/0p4-beta/oper/20220202000000-6h-oper-fc.grib2>/||20220125||/00z/0p4-beta/oper/||20220125000000||-24h-oper-fc.grib2
>>> --header=||"Range: bytes=17459800-18068845"|
>>>
>>> However the range values will change on every time step and every
>>> forecast and as such wont be viable to run automatically. I know its
>>> possible in python but like others I dont use python so my question
>>> is, is there a way to use wgrib or maybe .inv to breakdown the gribs
>>> into readable format using a perl code?
>>>
>>>
>>> -- Kind regards,
>>>
>>> *Stuart Markham*
>>>
>>> //
>>>
>>> /Founder of CW Weather/
>>>
>>> /Website: chorleyweather.com <https://www.chorleyweather.com/>/
>>>
>>>
>>> _______________________________________________
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>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>
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>
>
> --
>
> Kind regards,
>
> *Stuart Markham*
>
> //
>
> /Founder of CW Weather/
>
> /Website: chorleyweather.com <https://www.chorleyweather.com/>/
>
>
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