MARS/Dissemination

Specifies a rotation of the target grid.

rotation=<value>

A rotation is requested by specifying the position of the South Pole of the rotated grid as latitude/longitude in degrees, e.g. rotation = -30.0/10.0.

ValueComment
rotation = offno rotation (default)
rotation = a/ba is the latitude of the South Pole of rotation in deg.
b is the longitude of the South Pole of rotation in deg.

Rotation is strictly linked to the keyword GRID:

GRID specificationtarget grid
grid=lat/lonrotated regular lat/lon
grid=F...rotated full Gaussian grid
grid=N...rotated reduced Gaussian grid
grid=O...octahedral (reduced) Gaussian grid

and usually specified together with an AREA. Target fields in spherical harmonics are not supported. The default interpolation method used is linear.


Examples:

...
grid=0.5/0.5,                      # The target grid will be a regular 0.5 x 0.5 deg lat/lon grid
rotation= -25.0/15.0,   # with a South Pole at -25.0/15.0 deg
...

...
grid=N320,                         # The target grid will be an N320 reduced Gaussian grid
rotation= -25.0/15.0,   # with a South Pole at -25.0/15.0 deg
...