CDO - Resample netcdf files from monthly to daily timesteps-CodePudding

I have a netcdf file that has monthly global data from 1991 to 2000 (10 years).

Using CDO, how can I modify the netcdf from monthly to daily timesteps by repeating the monthly values each day of each month?

for eaxample,

convert from 
Month 1, value = 0.25

to 
Day 1, value = 0.25
Day 2, value = 0.25
Day 3, value = 0.25
....
Day 31, value = 0.25

convert from 
Month 2, value = 0.87

to 
Day 1, value = 0.87
Day 2, value = 0.87
Day 3, value = 0.87
....
Day 28, value = 0.87

Thanks

CodePudding user response：

The question is perhaps ambiguously worded. Adrian Tompkins' answer is correct for interpolation. However, you are actually asking to set the value for each day of the month to that for the first day of the month. You could do this by adding a second CDO call as follows:

cdo -inttime,1991-01-01,00:00:00,1day in.nc temp.nc

cdo -monadd -gtc,100000000000000000 temp.nc in.nc out.nc

Just set the value after gtc to something much higher than anything in your data.

CodePudding user response：

You can use inttime which interpolates in time at the interval required, but this is not exactly what you asked for as it doesn't repeat the monthly values and your series will be smoothed by the interpolation.

If we assume your dataset starts on the 1st January at time 00:00 (you don't state in the question) then the command would be

cdo inttime,1991-01-01,00:00:00,1day in.nc out.nc

This performs a simple linear interpolation between steps.

Note: This is fine for fields like temperature and seems to be want you ask for, but readers should note that one has to be more careful with flux fields such as rainfall, where one might want to scale and/or change the units appropriately.