[Wrf-users] How to crop a wrfout file

[M Mortezapour]

Thank you all for your reply. I've got a script which includes ncks
commands from Tanya and that works great.

Cheers,
Mari

On Tue, Jun 12, 2018 at 11:41 AM, Alex Fierro <alexandre.o.fierro at gmail.com>
wrote:

> Hello:
>
> Given that NCL is notoriously slow at handling large IO files, you can
> also pre-process the wrfout files with a Fortran program using the NETCDF
> built-in functions ("use netcdf" and compile with appropriate netcdf
> libs/include files) such as:
>
> ! get v ID
>       status = NF90_INQ_VARID(ncid,'V',variddat)
>       if (status /= nf90_noerr) call handle_err(status)
> ! get v array
>       status = NF90_GET_VAR(ncid,variddat,vv,start=(/nxstart,nystart,1/),
> stride=(/xstride,ystride,zstride/))
>       if (status /= nf90_noerr) call handle_err(status)
>
> In NF90_GET_VAR() you can either specify a start-end point for each
> dimension and/or use striding. Another way of reducing the IO size at
> runtime is to remove unwanted variables in the namelist (function of
> maxdom) via the flag:
>
> &time_control
> ...
> iofields_filename                   = "my_iofields_list.txt",
> "my_iofields_list.txt"
>
>
> where:
>
> > cat my_iofields_list.txt
>
> -:h:0:glw,pot,vt_dbz_wt,rainsh,tlwdn,tlwup,slwdn,
> slwup,tswdn,tswup,sswdn,sswup,p_hyd,sciona,sh2o,smcrel,tke_
> pbl,tslb,cldfra,el_pbl,qnccn,qncloud,qnrain,qnhail,
> qngraupel,qnice,qvgraupel,qnsnow,smois,acgrdflx,achfx,
> aclhf,albbck,albedo,avg_fuel_frac,canwat
> -:h:0:cosalpha,e,emiss,f,graupelnc,grdflx,hailnc,hml,
> huml,hvml,isltyp,ivgtyp,lai,lu_index,mapfac_m,mapfac_mx,
> mapfac_my,mapfac_u,mapfac_ux,mapfac_uy,mapfac_v,mapfac_vx,
> mapfac_vy,mf_vx_inv,nest_pos,noahres,mu,mub,olr,pblh,q2,
> seaice,sfroff,sinalpha,snopcx
> -:h:0:snow,snowc,snowh,snownc,soiltb,sr,sstsk,swdown,swnorm,
> t0ml,t2,th2,tml,tmn,tmoml,tsk,uah,udroff,up_heli_max,ust,
> vah,vegfra,xicem,xland,xlat_u,xlat_v,xlong_u,xlong_v,h0ml,clnox
>
> Cheers and hope this helps,
>
> Alex-
>
>
> -------------------------------------------------------------
> Alexandre Fierro, PhD
> Research Scientist-
> National Severe Storms Laboratory (NSSL/NOAA)
> *The Cooperative Institute for Mesoscale Meteorological Studies* (OU/NOAA)
>
> "Yesterday is History, Tomorrow is a Mystery and Today is a Gift; That is
> why it is called the Present"
>
> "There are only 10 types of people in the world:
> Those who understand binary, and those who don't"
>
> "My opinions are my own and not representative of OU, NSSL,
> AOML, HRD, LANL or any affiliates."
>          ^.^
>        (o  o)
>      /(   V   )\
>    ---m---m----
>
> On 12 June 2018 at 12:56, Barry Lynn <barry.h.lynn at gmail.com> wrote:
>
>> Hi:
>>
>> Are you aware that you can write some of the wrf output variables to an
>> external file?
>>
>> ;---Write variables to file
>>
>>
>> Note, the names on the right are obtained with wrf_user..., for example:
>>
>>
>> slp = wrf_user_getvar(a,"slp",it)
>>
>>
>> (remove the ;)
>>
>> ;     system("rm -f file_for_you.nc")
>>
>> ;     fout = addfile("file_for_you.nc","c")
>>
>> ;     fout->pett_fgen = pett_fgen
>>
>> ;     fout->z_plane   = z_plane
>>
>> ;     fout->xlat      = xlat
>>
>> ;     fout->xlong     = xlong
>>
>>
>> On Tue, Jun 12, 2018 at 5:37 PM M Mortezapour <mortezapour88 at gmail.com>
>> wrote:
>>
>>> Hello,
>>>
>>> I have some wrfout files that I should use them in another program, but
>>> they are too large. I need to crop a small part of them. I've searched a
>>> lot, but I couldn't find an efficient way. Any help would be appreciated.
>>>
>>> Thanks,
>>> Mari
>>> _______________________________________________
>>> Wrf-users mailing list
>>> Wrf-users at ucar.edu
>>> http://mailman.ucar.edu/mailman/listinfo/wrf-users
>>>
>>
>>
>> --
>> Barry H. Lynn, Ph.D
>> Senior Lecturer,
>> The Institute of the Earth Science,
>> The Hebrew University of Jerusalem,
>> Givat Ram, Jerusalem 91904, Israel
>> Tel: 972 547 231 170
>> Fax: (972)-25662581
>>
>> C.E.O, Weather It Is, LTD
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>>
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>>
>
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