Actions

CF-NETCDF.NC

From BAWiki

Basic Information

File-Type

cf-netcdf.nc

Version

April 2018

Description-Date

April 2018

Significance of the File

File-Contents (in Catchwords)

  1. header with metadata:
    1. list of dimensions (name and length),
    2. list of variables (name, type and dimension(s)) for which data are stored in the file,
    3. attributes related to variables (long_name, units etc.), and
    4. global attributes (title, history etc.).
    Remark: the names of attributes as well as standard variable names should be chosen according to the following given conventions:
  2. data for all variables stored in the file:
    1. coordinate-variable data,
    2. data for ordinary variables, for which only one data record is stored in the file, and finally
    3. data for record-variables (which have one unlimited dimension, e.g. time), which can be stored several times.

READ performance for large CF-NetCDF data files may strongly depend on the inner structure of the data file. The size of a data block (or chunk) which is accessed by one READ is significant in this context. A file can be considered as well structured if time series access as well as spatial access can be executed with similar effort (number of READs required). This can be achieved using appropriate chunk sizes for the variables stored. More informations can be found here:

  1. Chunking Data: Why it Matters, and
  2. Chunking Data: Choosing Shapes].

Programs using this Type of File

ArcGIS, DATACONVERT, DISPLAY_PERCENTILES, GRIDCONVERT, NCAGGREGATE, NCANALYSE, NCAUTO, NCCHUNKIE, NCCUTOUT, NCDELTA, NCPLOT, NCRCATMAT, NC2TABLE, NetCDF Operators, PLOTPROFILZEIT, QUICKPLOT, TAYLORDIAGRAM, UNK, UNTRIM2, UNTRIM2007

Additional Information

Language

Fortran90

File-Form

UNFORMATTED

File-Access

DIRECT

File-Extension

.nc

WRITE-Subroutine(s)/Module(s)

$PROGHOME/fortran/lib/l_grid/*/mod_p_l_grid_ui.f90 or
$PROGHOME/fortran/lib/h_grid/*/mod_p_h_grid_ui.f90 or
$PROGHOME/fortran/lib/p_grid/*/mod_p_p_grid_ui.f90 or
$PROGHOME/fortran/lib/io_insel/*/mod_io_insel_ui.f90 or
$PROGHOME/fortran/lib/k_model/*/mod_p_k_model_ui.f90

READ-Subroutine(s)/Module(s)

---

Original Version

G. Lang, S. Spohr

Maintenance

G. Lang, S. Spohr

Example-File

$PROGHOME/examples/lib/l_grid/lg.all_CF-NetCDF_Info.nc
$PROGHOME/examples/lib/h_grid/g05-Content.CF-NetCDF.nc
$PROGHOME/examples/lib/h_grid/UNTRIM-Content.CF-NetCDF.nc
$PROGHOME/examples/lib/h_grid/UTRSUB-Content.CF-NetCDF.nc
$PROGHOME/examples/lib/p_grid/profil05-Content.CF-NetCDF.nc
$PROGHOME/examples/lib/io_insel/insel.netcdf-cf.nc
$PROGHOME/examples/lib/k_model/2D.int.HPA.2d-hn-md.3h.xe.nc


back to: File Descriptions


Overview