how to change the variables name by using 'chname'

Hello, Everyone,

I just wanted to change the variables name from a netcdf file because the name of variables are contain '.'(dot) and I cannot display them with GRADS software. The information of the file is as follows.
ga-> sdfopen Interim_yearmean_1980_2011.nc 
Scanning self-describing file:  Interim_yearmean_1980_2011.nc
SDF file Interim_yearmean_1980_2011.nc is open as file 1
LON set to 0 180 
LAT set to 0 60 
LEV set to 0 0 
Time values set: 1980:12:1:0 1980:12:1:0 
E set to 1 1 
ga-> q file
File 1 : 
  Descriptor: Interim_yearmean_1980_2011.nc
  Binary: Interim_yearmean_1980_2011.nc
  Type = Gridded
  Xsize = 241  Ysize = 81  Zsize = 1  Tsize = 32  Esize = 1
  Number of Variables = 7
     rsn  0  t,y,x  Snow density
     p55.162  0  t,y,x  Vertical integral of water vapour
     p71.162  0  t,y,x  Vertical integral of eastward water vapour flux
     p72.162  0  t,y,x  Vertical integral of northward water vapour flux
     p84.162  0  t,y,x  Vertical integral of divergence of moisture flux
     tcwv  0  t,y,x  Total column water vapour
     t2m  0  t,y,x  2 metre temperature

So here I just used 'chname' to change the variable 'p55.162', but it failed. The error is as follows.
duan@duan-dynabook-T451-57DB:~/Hokkaidorainfall$ cdo chname, p55.162,viwv Interim_total_1980_2011.nc Interim_new_1980_2011.nc

Error (cdo chname) : Too many streams! Operator needs 1 input and 1 output streams.
duan@duan-dynabook-T451-57DB:~/Hokkaidorainfall$

So, anyone can help me how to use the right method to change the variables name including p55.162, p71.162, p72.162, and p84.162.

Thank you in advance!

Duan

Replies (4)

RE: how to change the variables name by using 'chname' - Added by Uwe Schulzweida almost 8 years ago

Remove the blank character after the first comma:

cdo chname, p55.162,viwv Interim_total_1980_2011.nc Interim_new_1980_2011.nc
           ^

cdo chname,p55.162,viwv Interim_total_1980_2011.nc Interim_new_1980_2011.nc

RE: how to change the variables name by using 'chname' - Added by Frida Perez about 3 years ago

Hi all,

I used this "chname" to change the name of one of my variables and it worked. However, the new file is missing the other 2 variables "lat" and "lon". Is there a way to change the name while keeping all the variables from the original file?

Thanks!

RE: how to change the variables name by using 'chname' - Added by Ralf Mueller about 3 years ago

If you want to keep everything the same, you can also use the NCO ncrename.

I cannot comment on why CDO didn't take over lon and lat, maybe they were not used by any data variable. With the input uploaded I can say more.

cheers
ralf

RE: how to change the variables name by using 'chname' - Added by Frida Perez almost 3 years ago

Hey ralf, that worked. I think you are right when you say they were not used by the data variable. Thanks!

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