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Adding time axis to netcdf files

Added by nazanin tavakoli about 3 years ago

Hello,
I want to add time axis to monthly netcdf files which have longitude,latitude, and a variable called Band1. I have tried the following code:
cdo -setreftime,1900-01-01,00:00:00,1day \
-settaxis,1901-01-01,12:00:00,1month \
-setcalendar,standard \
out1.nc < 2001_1.nc

cdo -setreftime,1900-01-01,00:00:00,1day \
-settaxis,1901-02-01,12:00:00,1month \
-setcalendar,standard \
out2.nc < 2001_2.nc

cdo -mergetime out*.nc final.nc

and here is my errors:

cdo setreftime (Abort): Too few streams specified! Operator needs 1 input and 1 output streams.

cdo setreftime (Abort): Too few streams specified! Operator needs 1 input and 1 output streams.

cdo mergetime: Open failed on >out*.nc<
No such file or directory

Could anybody help me?

ET.rar (978 KB) ET.rar

Replies (6)

RE: Adding time axis to netcdf files - Added by Brendan DeTracey about 3 years ago 

cdo -setreftime,1900-01-01,00:00:00,1day -setdate,1900-01-01 -setcalendar,standard 2001_1.nc out1.nc
cdo -setreftime,1900-01-01,00:00:00,1day -setdate,1900-02-01 -setcalendar,standard 2001_2.nc out2.nc
cdo -O mergetime out*.nc test.nc

RE: Adding time axis to netcdf files - Added by nazanin tavakoli about 3 years ago

Dear Brendan DeTracy,
I have used the code you have suggested, but the time axis in my output file is 0001-01-01 and 0001-02-01 instead of 2001-01-01 and 2001-02-01.

test.rar (980 KB) test.rar

RE: Adding time axis to netcdf files - Added by Brendan DeTracey about 3 years ago

Strange. It works for me...

$ ncdump -v time test.nc
netcdf test {
dimensions:
        time = UNLIMITED ; // (2 currently)
        lon = 559 ;
        lat = 1104 ;
variables:
        double time(time) ;
                time:standard_name = "time" ;
                time:units = "days since 1900-1-1 00:00:00" ;
                time:calendar = "standard" ;
                time:axis = "T" ;
        double lon(lon) ;
                lon:standard_name = "projection_x_coordinate" ;
                lon:long_name = "longitude" ;
                lon:units = "degrees_east" ;
                lon:axis = "X" ;
        double lat(lat) ;
                lat:standard_name = "projection_y_coordinate" ;
                lat:long_name = "latitude" ;
                lat:units = "degrees_north" ;
                lat:axis = "Y" ;
        int crs ;
                crs:grid_mapping_name = "latitude_longitude" ;
                crs:long_name = "CRS definition" ;
                crs:longitude_of_prime_meridian = 0. ;
                crs:semi_major_axis = 6378137. ;
                crs:inverse_flattening = 298.257223563 ;
                crs:spatial_ref = "GEOGCS[\"WGS 84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0],UNIT[\"degree\",0.0174532925199433],AUTHORITY[\"EPSG\",\"4326\"]]" ;
                crs:GeoTransform = "151.104872700202 0.004589522999999992 0 -28.34431309500599 0 -0.004589522999999993 " ;
        float Band1(time, lat, lon) ;
                Band1:long_name = "GDAL Band Number 1" ;
                Band1:grid_mapping = "crs" ;
                Band1:_FillValue = -3.402823e+38f ;
                Band1:missing_value = -3.402823e+38f ;

// global attributes:
                :CDI = "Climate Data Interface version 1.9.9 (https://mpimet.mpg.de/cdi)" ;
                :Conventions = "CF-1.5" ;
                :history = "Thu Apr 01 12:28:03 2021: cdo -O mergetime out1.nc out2.nc test.nc\n",
                        "Thu Apr 01 12:27:36 2021: cdo -setreftime,1900-01-01,00:00:00,1day -setdate,1900-01-01 -setcalendar,standard 2001_1.nc out1.nc\n",
                        "Wed Mar 31 11:18:42 2021: cdo divc,4 o2001_1.nc 2001_1.nc\n",
                        "Wed Mar 31 11:18:42 2021: cdo -add t2001_1_1.nc -add t2001_1_25.nc -add t2001_1_9.nc t2001_1_17.nc o2001_1.nc\n",
                        "Wed Mar 31 09:55:29 2021: cdo divc,8 o2001_1_1.nc t2001_1_1.nc\n",
                        "Wed Mar 31 08:29:49 2021: cdo -setrtomiss,3276.1,3276.7 2001_1_1.nc o2001_1_1.nc\n",
                        "Tue Mar 30 16:48:13 2021: GDAL CreateCopy( 2001_1_1.nc, ... )" ;
                :GDAL_AREA_OR_POINT = "Area" ;
                :GDAL_DataType = "Generic" ;
                :GDAL = "GDAL 2.4.2, released 2019/06/28" ;
                :CDO = "Climate Data Operators version 1.9.9 (https://mpimet.mpg.de/cdo)" ;
data:

 time = 0, 31 ;
}

Platform/version of cdo?
$ uname --all
Linux hecla 4.15.0-136-generic #140-Ubuntu SMP Thu Jan 28 05:20:47 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
$ cdo -V
Climate Data Operators version 1.9.9 (https://mpimet.mpg.de/cdo)
System: x86_64-conda-linux-gnu
CXX Compiler: /home/conda/feedstock_root/build_artifacts/cdo_1604652667339/_build_env/bin/x86_64-conda-linux-gnu-c++ -fPIC -DPIC -g -O2 -std=c++11 -fopenmp -DACCEPT_USE_OF_DEPRECATED_PROJ_API_H=1  -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe -isystem /home/brendan/miniconda3/envs/cmip6/include -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/cdo_1604652667339/work=/usr/local/src/conda/cdo-1.9.9 -fdebug-prefix-map=/home/brendan/miniconda3/envs/cmip6=/usr/local/src/conda-prefix -fopenmp -pthread
CXX version : unknown
C Compiler: /home/conda/feedstock_root/build_artifacts/cdo_1604652667339/_build_env/bin/x86_64-conda-linux-gnu-cc -DACCEPT_USE_OF_DEPRECATED_PROJ_API_H=1  -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe -isystem /home/brendan/miniconda3/envs/cmip6/include -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/cdo_1604652667339/work=/usr/local/src/conda/cdo-1.9.9 -fdebug-prefix-map=/home/brendan/miniconda3/envs/cmip6=/usr/local/src/conda-prefix -fopenmp -pthread -pthread
C version : unknown
F77 Compiler: /home/conda/feedstock_root/build_artifacts/cdo_1604652667339/_build_env/bin/x86_64-conda-linux-gnu-gfortran -fopenmp -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe -isystem /home/brendan/miniconda3/envs/cmip6/include -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/cdo_1604652667339/work=/usr/local/src/conda/cdo-1.9.9 -fdebug-prefix-map=/home/brendan/miniconda3/envs/cmip6=/usr/local/src/conda-prefix
F77 version : GNU Fortran (crosstool-NG 1.24.0.133_b0863d8_dirty) 9.3.0
Features: 62GB 24threads C++11 OpenMP45 Fortran PTHREADS HDF5 NC4/HDF5/threadsafe OPeNDAP UDUNITS2 PROJ XML2 CURL FFTW3 SSE3
Libraries: HDF5/1.10.6 proj/7.2.0 xml2/2.9.10 curl/7.71.1
Filetypes: srv ext ieg grb1 grb2 nc1 nc2 nc4 nc4c nc5
     CDI library version : 1.9.9
 cgribex library version : 1.9.5
 ecCodes library version : 2.19.1
  NetCDF library version : 4.7.4 of Oct 21 2020 19:55:48 $
    hdf5 library version : 1.10.6 threadsafe
    exse library version : 1.4.1
    FILE library version : 1.9.1

RE: Adding time axis to netcdf files - Added by Karin Meier-Fleischer about 3 years ago

Hi Nazanin and Brendan,

cdo -setreftime,2000-01-01,00:00:00,1day -settaxis,2001-01-01,12:00:00,1month -setcalendar,standard 2001_1.nc out1.nc

cdo -setreftime,2000-01-01,00:00:00,1day -settaxis,2001-02-01,12:00:00,1month -setcalendar,standard 2001_2.nc out2.nc

cdo -O -mergetime out*.nc final.nc

cdo sinfon final.nc 
   File format : NetCDF
    -1 : Institut Source   T Steptype Levels Num    Points Num Dtype : Parameter name
     1 : unknown  unknown  v instant       1   1    617136   1  F32  : Band1         
   Grid coordinates :
     1 : lonlat                   : points=617136 (559x1104)
                          mapping : latitude_longitude
                              lon : 151.1072 to 153.6681 by 0.004589523 degrees_east
                              lat : -33.40885 to -28.34661 by 0.004589523 degrees_north
   Vertical coordinates :
     1 : surface                  : levels=1
   Time coordinate :  2 steps
     RefTime =  2000-01-01 00:00:00  Units = days  Calendar = standard
  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss  YYYY-MM-DD hh:mm:ss
  2001-01-01 12:00:00  2001-02-01 12:00:00
cdo    sinfon: Processed 1 variable over 2 timesteps [0.00s 7208KB].

Happy Easter! ;)

RE: Adding time axis to netcdf files - Added by nazanin tavakoli about 3 years ago

Thank you both of you
Happy Easter, too!!

RE: Adding time axis to netcdf files - Added by Brendan DeTracey about 3 years ago

This chocolate rabbit tastes funny...

    (1-6/6)