Re: [ferret_users] Saturation max and color palette

["William S. Kessler" <William.S.Kessler@xxxxxxxx>]

I'm not sure if this is the problem, but sometimes FILL omits some  
areas of the plot. The first thing I would do if I found FILL not  
working perfectly would be to use SHADE. (You can always  
FILL/OVER/NOLAB afterwards and it usually looks ok).

Another small bug is that Ferret sometimes seems to have what might be  
a small rounding or precision error (?) in choosing the highest level.  
To avoid this, try choosing a value very close to 0.3:

>  yes? fill/levels=(-0.1,0.3,0.01) min(intensite,0.2999)
or

>  yes? fill/levels=(-0.1,0.3001,0.01) min(intensite,0.3)
However, another idea for masking high or low values would be to SHADE  
or FILL the mask over the original plot:

FILL temperature   ! use normal levels or choose them as desired
LET high_temp = if temperature ge 24 then temperature
FILL/OVER/PAL=lightgray high_temp   ! mask the high temperatures with a  
neutral color

Billy K

On Sep 23, 2005, at 3:09 AM, Tony Jolibois wrote:

>         Hi all,
>
>  I have problem with saturation in color palette : I want ferret to  
> put the last color palette for saturation max instead of white.
>  For that I use the command : fill/levels=($min,$max,$step)  
> min(variable, $max)
>  This command works well for one variable and not for another (see  
> plots attached).
>  Do you have an idea ?
>  Thanks,
>  Tony
>
>  This script works for saturation max :
>
> [mercator@rdp3-jaune temp]$ ferret -nojnl -gif
>          NOAA/PMEL TMAP
>          FERRET v5.81
>          Linux(g77) 2.4.21-32 - 07/13/05
>          23-Sep-05 10:01
>   
>  yes? use  
> "http://opendap.mercator-ocean.fr/thredds/dodsC/ 
> mercatorPsy2v1R1v_med_mean_best_estimate"
>  yes? set region/x=6W:36.5E/y=30.023N:45.964N/z=0/t=20-SEP-2005
>  yes? go mp_plate_caree
>  yes? set grid temperature
>  yes? go mp_aspect
>  yes? fill/levels=(20,24,0.1) min(temperature,24)
>  yes? frame/file=temperature_med.gif
>  yes? exit
>
> this one doesn't work :
>
> [mercator@rdp3-jaune temp]$ ferret -nojnl -gif
>          NOAA/PMEL TMAP
>          FERRET v5.81
>          Linux(g77) 2.4.21-32 - 07/13/05
>          23-Sep-05 10:03
>   
>  yes? use  
> "http://opendap.mercator-ocean.fr/thredds/dodsC/ 
> mercatorPsy2v1R1v_med_mean_best_estimate"
>  yes? yes? set region/x=6W:36.5E/y=30.023N:45.964N/z=0/t=20-SEP-2005
>  yes? yes? go mp_plate_caree
>  yes? yes? set grid temperature
>  yes? yes? go mp_aspect
>  yes? let intensite=(u^2 + v^2)^.5
>  yes? fill/levels=(-0.1,0.3,0.01) min(intensite,0.3)
>  yes? frame/file=med.gif
>  yes? exit
>
> --
> Tony Jolibois
>
> CLS - Direction Océanographie Spatiale
> 8-10 rue hermès - 31520 Ramonville Saint-Agne
> tjolibois@cls.fr
>
> Tél : +33 (0) 561 393 797
> Fax : +33 (0) 561 393 782
>
> <med.gif><temperature_med.gif>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
William S. Kessler
NOAA / Pacific Marine Environmental Laboratory
7600 Sand Point Way NE
Seattle WA 98115 USA

william.s.kessler@noaa.gov
Tel: 206-526-6221
Fax: 206-526-6744
Home page: http://www.pmel.noaa.gov/~kessler