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ECMWF Reanalysis Data-Assimilation (ERA40)

NCL supports accessing datasets in a variety of formats including GRIB1 and GRIB2. (GRIB2 support was added in version 4.3.0.) 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.

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

era40_1.ncl: A simple color plot from an grib file.

gsn_csm_contour_map_ce is the plot interface that 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 map.

Learn more about how to plot vectors at the vector example page