[ncl-talk] write variable attribute
Dennis Shea
shea at ucar.edu
Wed Sep 2 09:19:39 MDT 2015
if 'temp2' has lat, lon coordinate variables
printVarSummary(temp2)
delete( [/ temp2&lat, temp2&lon /] ) ; 6.3.0
delete(temp2&lat) ; previous versions of NCL
delete(temp2&lon)
printVarSummary(temp2)
ncdf->temp2 = temp2 ;***** NOT (/temp2/)
If you are writing TFLAG, you must do the same for that variable
On Fri, Aug 28, 2015 at 4:51 PM, Luo, Chao <chao.luo at eas.gatech.edu> wrote:
> Sorry, I made the mistake. It works. This write out metadata, including lat/lon. Is it possible to just write out variable value and attribute, not lat/lon data?
>
> Thanks much,
>
> Chao
>
> ----- Original Message -----
> From: "Dennis Shea" <shea at ucar.edu>
> To: "Chao Luo" <chao.luo at eas.gatech.edu>
> Cc: "Alan Brammer" <abrammer at albany.edu>, "ncl-talk Talk" <ncl-talk at ucar.edu>
> Sent: Friday, August 28, 2015 1:41:32 PM
> Subject: Re: [ncl-talk] write variable attribute
>
> Alan's script should work.
>
> system("/bin/rm -f test.nc")
> ncout = addfile("test.nc","c")
> x = 0
> x!0 = "test"
> x&test = 23
> x at Some_att = "First Att"
> x at Some_other_att = "Second Att"
> x at date = systemfunc("date")
> ncout->x = x
> quit
>
> If the above does not work ... something is wrong
>
> diro = "/data11/cluo/cmaq4.6/data/post/smk31_post/"
> filo = "out.nc" ; input file name
> fl_nm_out = diro+filo
> system ("/bin/rm -f "+fl_nm_out) ; Remove any pre-existing file
> ncdf = addfile(fl_nm_out,"c")
>
> [snip]
>
> temp2 = ESMF_regrid(temp2_36,Opt) ; Do the regridding
> printVarSummary(temp2) ; this has attributes and possiblt time/level
> ; coordinate information
>
> ; not sure why you are doing this
> temp2!0 = "time"
> temp2!1 = "lay"
> temp2!2 = "lat"
> temp2!3 = "lon"
> temp2 at long_name = "TEMP2"
> temp2 at units = "k"
> temp2 at var_desc = "temperature at 2 m"
>
> printVarSummary (temp2)
> printMinMax(temp2,True)
>
> ncdf->TFLAG =TFLAG
> ncdf->temp2 = temp2 ;***** NOT (/temp2/)
>
> ; the (/.../) strip meta data
>
> On Fri, Aug 28, 2015 at 2:21 PM, Luo, Chao <chao.luo at eas.gatech.edu> wrote:
>> Thanks very much for your help and time. I still can't write out variable
>> attribute even I followed your sample, and I don't what caused the problem.
>> Appreciate any suggestions.
>>
>> Chao
>>
>> ________________________________
>> From: "Alan Brammer" <abrammer at albany.edu>
>> To: "Chao Luo" <chao.luo at eas.gatech.edu>
>> Cc: "ncl-talk Talk" <ncl-talk at ucar.edu>
>> Sent: Friday, August 28, 2015 12:39:28 PM
>>
>> Subject: Re: [ncl-talk] write variable attribute
>>
>> The below example is how it should work. A ncl_filedump of your output
>> netcdf might be useful for people to see what is missing compared to the
>> data in the script.
>> Not sure I follow what the problem is. If the metadata is written I don't
>> see how the attributes weren't also.
>>
>>
>> $ ncl
>>
>>
>> ncout = addfile("test.nc","c")
>> x = 0
>> x!0 = "test"
>> x&test = 23
>> x at Some_att = "First Att"
>> x at Some_other_att = "Second Att"
>> x at date = systemfunc("date")
>> ncout->x = x
>> exit
>>
>> $ ncl_filedump test.nc
>> Copyright (C) 1995-2015 - All Rights Reserved
>> University Corporation for Atmospheric Research
>> NCAR Command Language Version 6.3.0
>> The use of this software is governed by a License Agreement.
>> See http://www.ncl.ucar.edu/ for more details.
>>
>> Variable: f
>> Type: file
>> filename: test
>> path: test.nc
>> file global attributes:
>> dimensions:
>> test = 1
>> variables:
>> integer x ( test )
>> date : Fri Aug 28 19:32:35 UTC 2015
>> Some_other_att : Second Att
>> Some_att : First Att
>>
>> integer test ( test )
>>
>>
>> On Fri, Aug 28, 2015 at 3:13 PM, Luo, Chao <chao.luo at eas.gatech.edu> wrote:
>>>
>>> Yes, it write out metadata of TEMP2, but still no TEMP2 attribute write
>>> out when I use ncdf->tem2 = temp2. What I want to write out is TEMP2 values
>>> and attribute. Thanks!
>>>
>>> Chao
>>>
>>> ________________________________
>>> From: "Alan Brammer" <abrammer at albany.edu>
>>> To: "Chao Luo" <chao.luo at eas.gatech.edu>
>>> Cc: "ncl-talk Talk" <ncl-talk at ucar.edu>
>>> Sent: Friday, August 28, 2015 11:06:55 AM
>>> Subject: Re: [ncl-talk] write variable attribute
>>>
>>>
>>> You've commented out the line that explicitly writes the attributes to the
>>> file. Likely because you haven't explicitly defined the variable in the
>>> file.
>>> But by also surrounding temp2 with (/ /) you're telling ncl to not copy
>>> any metadata.
>>> That notation is only useful when you have already defined the variable in
>>> the file.
>>> So
>>> ncdf->temp2 = temp2
>>> Will write out the contents and the metadata/attributes with the variable.
>>>
>>>
>>>
>>> ; filevarattdef(ncdf,"temp2",temp2)
>>>
>>> ncdf->TFLAG =TFLAG
>>> ncdf->temp2 = (/temp2/)
>>>
>>> On Fri, Aug 28, 2015 at 1:33 PM, Luo, Chao <chao.luo at eas.gatech.edu>
>>> wrote:
>>>>
>>>> Dear All,
>>>>
>>>> I am working on temperature interpolation from 36km to 4km by
>>>> ESMF_regrid, and want to write out the TEMP2 at new resolution,
>>>> unfortunately the temp2 attribute didn't write out in netcdf file, I have
>>>> tried to define TEMP2 attribute by:
>>>>
>>>> temp2!0 = "time"
>>>> temp2!1 = "lay"
>>>> temp2!2 = "lat"
>>>> temp2!3 = "lon"
>>>> temp2 at long_name = "TEMP2"
>>>> temp2 at units = "k"
>>>> temp2 at var_desc = "temperature at 2 m"
>>>>
>>>> and by function of filevarattdef. Both didn't work.
>>>>
>>>> Thanks very much for and help or suggestions!
>>>>
>>>> Here is the script I used:
>>>>
>>>>
>>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
>>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
>>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/esmf/ESMF_regridding.ncl"
>>>>
>>>> begin
>>>>
>>>> diri_36 = "/data11/cluo/CMAQv5.0.1/scripts/mcip4.1/36km/201107/data/"
>>>> diri_4 = "/data12/cluo/smoke3.6.5/data/ge_dat/"
>>>> namei_36 = "GRIDCRO2D_148x112_20110701"
>>>> namei_4 = "geo_em.d01_1332x1008.nc"
>>>>
>>>> f1 = addfile(diri_36+namei_36,"r")
>>>>
>>>> ;output lat/lon
>>>> lat2d_36km = f1->LAT(0,0,:,:) ; (TSTEP, LAY, ROW, COL) , 36km
>>>> lon2d_36km = f1->LON(0,0,:,:) ; (TSTEP, LAY, ROW, COL) , 36km
>>>>
>>>> printVarSummary (lon2d_36km)
>>>> printMinMax(lon2d_36km,True)
>>>>
>>>>
>>>> f2 = addfile(diri_4+namei_4,"r")
>>>> ;input lat/lon
>>>>
>>>> lat2d_4km = f2->XLAT_M(0,:,:) ; 4km
>>>> lon2d_4km = f2->XLONG_M(0,:,:) ; 4km
>>>>
>>>> printVarSummary (lon2d_4km)
>>>> printMinMax(lon2d_4km,True)
>>>>
>>>> name_in = "METCRO2D_148x112_20110701"
>>>>
>>>> nlay = 1
>>>> ntime = 25
>>>>
>>>> time = new((/ntime/),integer)
>>>> time = ispan(0,ntime-1,1)
>>>>
>>>> f3 = addfile(diri_36+name_in,"r") temp2_36 = f3->TEMP2(:,:,:,:)
>>>> ;(TSTEP, LAY, ROW, COL)
>>>> TFLAG = f3->TFLAG(:,0,:)
>>>> temp2_36 at _FillValue = 9.999e+36
>>>>
>>>> printVarSummary (temp2_36)
>>>> printMinMax(temp2_36,True)
>>>>
>>>> diro = "/data11/cluo/cmaq4.6/data/post/smk31_post/"
>>>> filo = "out.nc" ; input file name
>>>> fl_nm_out = diro+filo
>>>> system ("/bin/rm -f "+fl_nm_out) ; Remove any pre-existing file
>>>> ncdf = addfile(fl_nm_out,"c")
>>>>
>>>> ;---Set up options for regridding
>>>> Opt = True
>>>>
>>>> Opt at SrcGridLat = lat2d_36km ; source grid
>>>> Opt at SrcGridLon = lon2d_36km
>>>> Opt at DstGridLat = lat2d_4km ; destination grid
>>>> Opt at DstGridLon = lon2d_4km
>>>>
>>>> Opt at SrcRegional = True ; Necessary if grids
>>>> Opt at DstRegional = True ; are regional
>>>>
>>>> Opt at InterpMethod = "bilinear" ; "patch", "conserve"
>>>>
>>>> Opt at ForceOverwrite = True ; Optional, but recommended.
>>>> Opt at PrintTimings = True ; Optional.
>>>> Opt at Debug = True ; Optional
>>>>
>>>> temp2 = ESMF_regrid(temp2_36,Opt) ; Do the regridding
>>>>
>>>> temp2!0 = "time"
>>>> temp2!1 = "lay"
>>>> temp2!2 = "lat"
>>>> temp2!3 = "lon"
>>>> temp2 at long_name = "TEMP2"
>>>> temp2 at units = "k"
>>>> temp2 at var_desc = "temperature at 2 m"
>>>>
>>>> printVarSummary (temp2)
>>>> printMinMax(temp2,True)
>>>>
>>>> ; filevarattdef(ncdf,"temp2",temp2)
>>>>
>>>> ncdf->TFLAG =TFLAG
>>>> ncdf->temp2 = (/temp2/)
>>>>
>>>> end
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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>>>
>>>
>>
>>
>>
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