unpack_masked_data_3d

Authors

Eric Maisonnave (CERFACS) and Pascal Terray (LOCEAN/IPSL)

Latest revision

29/05/2024

Purpose

Unpack a packed tridimensional NetCDF variable produced by pack_masked_data_3d or derived from an NCSTAT analysis of such packed tridimensional NetCDF variable and store the results in an output NetCDF dataset.

Further Details

Usage

$ unpack_masked_data_3d \
  -f=input_netcdf_file \
  -v=packed_netcdf_variable \
  -m=input_mesh_mask_netcdf_file \
  -o=output_netcdf_file \
  -t=time1,time2                    (optional) \
  -g=grid_type                      (optional : n, t, u, v, w, f) \
  -bigfile                          (optional) \
  -hdf5                             (optional) \
  -tlimited                         (optional)

By default

-t=
the whole time period associated with the packed_netcdf_variable
-g=
the grid_type is set to n which means that the 2-D grid-mesh associated with the original (unpacked) NetCDF variable is assumed to be regular or Gaussian
-bigfile
a NetCDF classical format file is created. If -bigfile is activated, the output NetCDF file is a 64-bit offset format file
-hdf5
a NetCDF classical format file is created. If -hdf5 is activated, the output NetCDF file is a NetCDF-4/HDF5 format file
-tlimited
the time dimension is defined as unlimited in the output NetCDF file. However, if -tlimited is activated, the time dimension is defined as limited in the output NetCDF file

Remarks

  1. The -v=packed_netcdf_variable argument specifies the NetCDF variable which must be unpacked and the -f=input_netcdf_file argument specifies that this NetCDF variable must be extracted from the NetCDF file input_netcdf_file.

  2. The argument -m=input_mesh_mask_netcdf_file specifies that the land-sea mask to use for unpacking the packed_netcdf_variable must be read from the input_mesh_mask_netcdf_file.

    This input_mesh_mask_netcdf_file may be created by comp_clim_3d if the 2-D grid-mesh is regular or gaussian and it must be the one used originally to pack the data with pack_masked_data_3d.

  3. If the -t=time1,time2 argument is missing the whole time period associated with the packed_netcdf_variable is used to construct the output NetCDF variable.

    The selected time period is a vector of two integers specifying the first and last time observations. The indices are relative to 1. Note that the output NetCDF file will have ntime = time2 - time1 + 1 time observations.

  4. If -g= is set to t, u, v, w or f it is assumed that the original NetCDF variable is from an experiment with the ORCA or NEMO model.

    If -g= is set to n, it is assumed that the 2-D grid-mesh is regular or Gaussian.

    The -g= argument is also used to determine the name of the NetCDF variable which contains the 2-D mesh-mask in the input_mesh_mask_netcdf_file (e.g., it is assumed that this variable is named grid_typemask).

  5. The -bigfile argument is allowed only if the NCSTAT software has been compiled with the _USE_NETCDF36 or _USE_NETCDF4 CPP macros (e.g., -D_USE_NETCDF36 or -D_USE_NETCDF4) and linked to the NetCDF 3.6 library or higher.

    If this argument is specified, the output_netcdf_file will be a 64-bit offset format file instead of a NetCDF classic format file. However, this argument is recognized in the procedure only if the NCSTAT software has been built with the _USE_NETCDF36 or _USE_NETCDF4 CPP macros.

  6. The -hdf5 argument is allowed only if the NCSTAT software has been compiled with the _USE_NETCDF4 CPP macro (e.g., -D_USE_NETCDF4) and linked to the NetCDF 4 library or higher.

    If this argument is specified, the output_netcdf_file will be a NetCDF-4/HDF5 format file instead of a NetCDF classic format file. However, this argument is recognized in the procedure only if the NCSTAT software has been built with the _USE_NETCDF4 CPP macro.

  7. Duplicate parameters are allowed, but this is always the last occurrence of a parameter which will be used for the computations. Moreover, the number of specified parameters must not be greater than the total number of allowed parameters.

Examples

  1. For unpacking a NetCDF variable sosstsst extracted from the NetCDF dataset packed_ST7_1m_0101_20012_grid_T_sosstsst.nc with the help of a land-sea mask extracted from the NetCDF file mesh_ocean.nc and store the results in a NetCDF file named ST7_1m_0101_20012_grid_T_sosstsst.nc use the following command (note that the variable sosstsst is from a NEMO simulation since -g=t is specified) :

    $ unpack_masked_data_3d \
  -f=ST7_1m_0101_20012_grid_T_sosstsst.nc \
  -v=sosstsst \
  -m=mesh_ocean.nc \
  -o=ST7_1m_0101_20012_grid_T_sosstsst.nc \
  -g=t
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