1. See data
ncdump -h or -c #see the dimension and data info
2. Manipulating data
Extract data by timestep
cdo -O seltimestep,1,32,61 in.nc out.nc #extract the timestep 1, 32, and 61 from in.nc
Extract data by variable
cdo -O selname,storage in.nc out.nc #extract the storage variable
or
ncks -A -v storage in.nc out.nc
Delete data by timestep
cdo -O delete,timestep=13 temp.nc temp1.nc # delete the 13th time frame
Rename a variable
ncrename -v OldVarName,NewVarName in.nc #change variable name
3. Math
Add/subtract/multiply/divide two nc files
cdo -O add/sub/mul/div in1.nc in2.nc out.nc #add two nc files and output
Multiply by a constant (e.g. 0)
cdo -O mulc,0 in1.nc out.nc
Create new variable by adding others
ncap -O -s "storage=SoilMoist_1+SoilMoist_2+SoilMoist_3+SWE" in.nc out.nc
or
cdo expr,'runoff=srfrun+subrun;' in.nc out.nc
Add the field
cdo -O fldsum in.nc out.nc #add the value at each field
4. I/O
Output to ascii
cdo output in.nc > out.txt
5. ncview
Output frame as .png file when using ncview
ncview -frame in.nc