NCL is updated continually to include new tables. In addition, users may input their own parameter tables, if desired.
You can also use NCL to learn more about a grib file: grib_read.txt
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Application examples>
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Data files for some examples
era40_1.ncl:
A simple color plot from an grib file.
era40_2.ncl:
A simple vector plot.
e20c_1.ncl:
A sample E20C file with variable 'Cloud Cover'. Same as all other ERA GRIB files.
e20c_2.ncl:
Compute the monthly means at 00Z, 12Z at 750hPa and the overall monthly mean at 500hPa.
The cd_calendar function is used to create time information in different forms;
the ind function is used to determine the index vlues associated at different hours;
the dim_avg_n_Wrap calculate the means and retains all meta data.
Example pages containing:
tips |
resources |
functions/procedures
NCL Graphics: ECMWF Reanalysis Data-Assimilation
NCL supports accessing datasets in a variety of formats including
GRIB1 and GRIB2. NCL is aware
of the various Grid
Parameter Tables (GBT) needed to properly assign meta data( attributes and coordinate variables) to
the decoded variable arrays.
era40_1.ncl:
A simple color plot from an grib file.
gsn_csm_contour_map is the plot interface that, by default, creates a cylindrical equidistant plot.
era40_2.ncl:
A simple vector plot.
gsn_csm_vector_map_ce is the plot interface that draws vectors over a cylindrical equidistant map.
Learn more about how to plot vectors at the vector example page
e20c_1.ncl:
A sample E20C file with variable 'Cloud Cover'. Same as all other ERA GRIB files.
gsn_csm_contour_map is the plot interface that, by default, creates a cylindrical equidistant plot.
e20c_2.ncl:
Compute the monthly means at 00Z, 12Z at 750hPa and the overall monthly mean at 500hPa.
The cd_calendar function is used to create time information in different forms;
the ind function is used to determine the index vlues associated at different hours;
the dim_avg_n_Wrap calculate the means and retains all meta data.