Re: Problem of longitudinal cyclicity.

[Steve Hankin <hankin@xxxxxxxxxxxxx>]

Hi Neven,

A first guess is that the data set does not contain an attribute to tell
Ferret that the longitude axis is "modulo". Try the command
    yes? SHOW GRID
The "m" on the X axis indicates that it is modulo.

     yes? show grid sst
         GRID COADS
      name       axis              # pts   start                end
      COADSX    LONGITUDE          180mr   21E                  19E(379)

      COADSY    LATITUDE            90 r   89S                  89N

If the "m" is missing, you can tell Ferret that the axis is modulo with this
command:

    yes? SET AXIS/modulo <axis_name>

You can insert the longitude axis_name of your variable automatically with
the syntax
    `my_variable,return=xaxis`

    - steve

----------------------------------

"Neven S. Fuckar" wrote:

> Howdy ferreters,
> I'm working on one global data set (I=1:181, J=1:64, ...).
> Problem is when I want to make figure of Atlantic, let say SST from 75
> west to 25 east (set region/x=75W:25E/...). Ferret simple chops it at the
> zero meridian, i.e. plots STT from 75 west to Greenwich prime meridian.
> To me it looks like Ferret have problem with cyclicity of this data.
> I would appreciate any explantion or suggestion of how to make Ferret to
> include on figure also an area on the left side of the prime meridian.
> All the best,
> Neven
>
> -------------------------------
> Neven Stjepan Fuckar
> Texas A&M University
> Department of Oceanography
> College Station
> TX 77843-3146, USA
> phone: 1-979-845-3238
> -------------------------------

--
Steve Hankin
NOAA/PMEL, 7600 Sand Point Way NE, Seattle, WA 98115-0070
ph. (206) 526-6080 -- FAX (206) 526-6744