[ncl-talk] write variable attribute

[Luo, Chao]

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 

----- Original Message -----

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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