add mask file to time series data

Hi,
I have a mask file (FR_LAND1.nc), which I apply with cdo add to a time series file (test.nc), which contains 16 land cover fractions over 85 time steps. Normally, the mask file is applied to all time steps to each parameter, but here the output contains only one time step. It reads:
cdo add: Filling up stream2 >FR_LAND1.nc< by copying the first variable.
cdo add: Processed 4721750 values from 2 variables over 3 timesteps [0.26s 66MB].
How can I apply the mask file with the cdo add command to all parameters over all time steps?
Cheers, Merja

Download all files

FR_LAND1.nc (3.18 MB) FR_LAND1.nc
test.nc (86.9 MB) test.nc

Replies (4)

RE: add mask file to time series data - Added by Estanislao Gavilan almost 2 years ago

Hi Merja,

you need to be a bit more specific, What command do you use to mask all the time steps?

Kind regards,

Estanislao

RE: add mask file to time series data - Added by Merja Tölle almost 2 years ago

Hi,
I want to apply a mask file to a time series file. Normally, the mask file is applied to all time steps of each parameter. I get an error
after using the following command:
cdo add test.nc FR_LAND1.nc test1.nc
In test1.nc all time steps except the first are removed.
Previously it worked. Now, I get this error, but I do not know why. Could you please help?
Best, Merja

RE: add mask file to time series data - Added by Karin Meier-Fleischer almost 2 years ago

Hi Merja,

I'm not able to reproduce the problem with CDO 2.0.5 and 2.1.1. All time steps are taken and the calculation is done over the 5 time steps. Which CDO version are you using?

If you want to use FR_LAND, which contains zeros and missing values as mask you should keep the missing values and change the zeros to ones:

cdo -div test.nc -addc,1 FR_LAND1.nc outfile.nc

cdo(1) addc: Process started
cdo    div: Filling up stream2 >(pipe1.4)< by copying the first variable.
cdo(1) addc: Processed 277750 values from 1 variable over 1 timestep
cdo    div: Processed 22497750 values from 2 variables over 6 timesteps [0.47s 35MB]

cdo sinfon outfile.nc

   File format : NetCDF2
    -1 : Institut Source   T Steptype Levels Num    Points Num Dtype : Parameter name
     1 : unknown  Land     v instant      16   1    277750   1  F32  : landCoverFrac 
   Grid coordinates :
     1 : curvilinear              : points=277750 (505x550)
                              lon : -59.43533 to 85.55104 degrees_east
                              lat : 12.70589 to 79.075 degrees_north
                          mapping : rotated_latitude_longitude
                             rlon : -32.115 to 23.325 by 0.11 degrees
                             rlat : -32.065 to 28.325 by 0.11 degrees
   Vertical coordinates :
     1 : generic                  : levels=16
                           lctype : 1 to 16 by 1 
   Time coordinate :
                             time : 5 steps
     RefTime =  1950-01-01 12:00:00  Units = days  Calendar = proleptic_gregorian
  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss
  2016-01-01 12:00:00  2017-01-01 12:00:00  2018-01-01 12:00:00  2019-01-01 12:00:00
  2020-01-01 12:00:00

RE: add mask file to time series data - Added by Merja Tölle almost 2 years ago

I found it. It is a misstake in the CDO version cdo/2.0.4-gcc-11.2.0.
With CDO version cdo/2.0.6-gcc-11.2.0 it works fine.

Best, Merja

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