The -new_grid_winds option selects the wind rotation/orientation
for the -new_grid option. This orientation should apply to all
vector quantities. However, the grib format doesn't have a flag specifying which fields
are vector fields. Sometimes you like to treat vector quanties as scalars because it
makes interpolation easier (for example a time series of tropical U fields). Another
compliation is that the default action of copygb is to only treat U and V as vectors.
Other vector quantites are interpolated as scalars.
-new_grid_vectors option allows you to select which fields
will be interpolated as vectors. The options are,
- none -all fields are interpolated as scalars
- UGRD:VGRD -only UGRD and VGRD are interpolated as vectors (like copygb)
- default -UGRD,VGRD,UVCSH,VVCSH,UFLX,VFLX,UGUST,
VGRUS,USTM,VSTM,VDFUA,VDFVA,UOGRD,VOGRD are interpolated as vectors (the list will expand when needed)
X = none, default, UGRD:VGRD
See also: -new_grid,