[ncl-talk] _FillValue directly from a file variable

[Toni Klemm]

Hm, I’m not familiar with GRIB files. But generally, don’t you *have* to load the content from all files if you want to aggregate content from multiple files into one? Or are the files too large to load them all at once?

Toni


Toni Klemm, Ph.D.
Postdoctoral Research Associate
Department of Ecosystem Science and Management
College of Agriculture and Life Sciences
Texas A&M University, College Station, TX
Contributor to the Early Career Climate Forum <http://www.eccforum.org/>
www.toni-klemm.de <http://www.toni-klemm.de/> | @toniklemm <http://twitter.com/toniklemm>








> On Sep 10, 2018, at 4:01 PM, Mateus da Silva Teixeira <mateusstex at gmail.com> wrote:
> 
> Sorry about grammatical error: ... not be more specific.
> 
> Best regards,
> 
> Mateus
> 
> 
> Em seg, 10 de set de 2018 às 17:57, Mateus da Silva Teixeira <mateusstex at gmail.com <mailto:mateusstex at gmail.com>> escreveu:
> Hi Toni,
> 
> Thank you for your reply.
> 
> Sorry for not being more specific. Actually, I have more than 30 GRIB 1/2 files and I would like to define a single variable (with new function) to hold data from all files. Part of these files are in GRIB 1 format and other part is in GRIB 2. Also, variable name changes from GRIB 1 to GRIB 2 format, even the files coming from same source (GFS ANL). So, I want, after working with these differences, to put all data into the same array.
> 
> Thanks,
> 
> mateus
> 
> 
> Em seg, 10 de set de 2018 às 17:47, Toni Klemm <toni-klemm at tamu.edu <mailto:toni-klemm at tamu.edu>> escreveu:
> Hi Mateus,
> 
> I imagine there are more elegant ways, but if you don’t have too many files (or if they have the same variable type (int, float, …), you can run the command 
> 
> ncdump -h file/path/and/filename.nc <https://urldefense.proofpoint.com/v2/url?u=http-3A__filename.nc&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=QNHQY-Rg2SD7O4tjt83KFOLSP78h3Xsi7Gp8DZC4XjQ&s=nGgX5SBhjflILx1upQjtPTbXH-SW2BKF3RylaoX5oeM&e=>
> 
> which will give you the metadata to each variable, and copy-paste the _FillValue value of your variable directly into your NCL script. Another way is to view the file in a viewer like Panoply and get the _FillValue that way.
> 
> Hope that helps,
> Toni
> 
> 
> Toni Klemm, Ph.D.
> Postdoctoral Research Associate
> Department of Ecosystem Science and Management
> College of Agriculture and Life Sciences
> Texas A&M University, College Station, TX
> Contributor to the Early Career Climate Forum <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.eccforum.org&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=QNHQY-Rg2SD7O4tjt83KFOLSP78h3Xsi7Gp8DZC4XjQ&s=QUEh_u_3pzFgPJlCLTXhCDGj-D3g91zg-BqeSy81OCs&e=>
> www.toni-klemm.de <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.toni-2Dklemm.de&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=QNHQY-Rg2SD7O4tjt83KFOLSP78h3Xsi7Gp8DZC4XjQ&s=VU_wO4xhSNGiMrxkh2cdBDlVDCFdstJTeeISiPDr1zs&e=> | @toniklemm <https://urldefense.proofpoint.com/v2/url?u=http-3A__twitter.com_toniklemm&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=QNHQY-Rg2SD7O4tjt83KFOLSP78h3Xsi7Gp8DZC4XjQ&s=vCNxBBWrfi20WfSVT8WwtxB8Z5Y1OLH3Am8YgLAefPs&e=>
> 
> 
> 
> 
> 
> 
> 
> 
>> On Sep 10, 2018, at 3:34 PM, Mateus da Silva Teixeira <mateusstex at gmail.com <mailto:mateusstex at gmail.com>> wrote:
>> 
>> Hi,
>> 
>> Is there a way to get _FillValue attribute from a file variable without loading that variable?
>> 
>> I found getFillValue function, but I think it won't work like I expect. Also, function getfilevaratts only gives a list of the attributes. I would like to directly access the content of this attribute.
>> 
>> Thanks,
>> 
>> Mateus
>> 
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