Re: [ferret_users] PLOT data along satellite track USING FERRET

[Russ Fiedler <russell.fiedler@xxxxxxxx>]

Hi Haoping,

You might like to look at the polymark or polytube scripts.

The demos are run by

go polymark_demo
go polytube_demo

The first displays polygons with colour representing SSH whereas the
second you get a "tube" with varying colours.

If you have 2 distinct tracks you may need to split the time series into
2 parts for the polytube (separate the two tracks with a pair of dummy
lat/lons and a missing value for SSH) or you may get an odd effect at
the discontinuity. 

Russ


On Tue, 2011-12-20 at 10:08 +1100, Haoping Yang wrote:
> Dear ferreters,
> 
> I want to plot some along-track SSH observation data using ferret if 
> possible. The netcdf file contains LON, LAT, SSH but they are all 
> 1-dimensional as functions of i_index from 1 to 130 (for one day).
> 
>         FERRET v6.1 
>         Linux(g77) 2.6.9-22. - 03/26/08
>         19-Dec-11 17:49    
> yes? use filename.nc
> yes? show data
>      currently SET data sets:
>     1> ./filename.nc  (default)
>  name     title                         I         J         K         L
>  LONGITUDE                   1:130     ...       ...       ...
>  LATITUDE                      1:130     ...       ...       ...
>  SSH_OBS                         1:130     ...       ...       ...
>  yes? show data/attribute
>      currently SET data sets:
>     1> ./filename.nc  (default)
>  VARIABLE               ATTRIBUTE NAME      TYPE    SIZE OUTFLAG VALUE
> --------------------------------------------------------------------------------
>  LONGITUDE              valid_range         FLOAT   2    F      -98 -76
>  LATITUDE               valid_range         FLOAT   2    F      18 32
>  SSH_OBS                valid_range         FLOAT   2    F      -5 5
> 
> Is there an easy way to plot this data in 2-d gulf of mexico region (the 
> data will appear like one or two straight lines)? Any instructions or 
> hints will be appreciated.
> Regards,
> 
> Haoping