Re: [ferret_users] Ship trackline: CALENDAR and LABEL command

[Ansley Manke <ansley.b.manke@xxxxxxxx>]

Hi Goran,
For your first question, you can get part of the tlab string by applying 
the SUBSTRING function to the date string,

  LET tlab = SUBSTRING("`T[GT=GDD1],RETURN=tstart`",13,5)

And, for your second question, assuming SST is a function only of time, 
put it in grave accents to force it to be evaluated, just as the 
longitude and latitude variables are evaluated

  REPEAT/L=588:6088:500 (LABEL `longitude` `latitude-0.025` 1 0 0.1 
"`SST`")

Ansley

Goran Georgievski wrote:

> Dear Ferret users,
>
> I have two netcdf files. One is model output another is ship track written as 
> suggested by CF convention for storing trajectory data. I am able to plot 
> ship trackline on the shade basemap as suggested in FAQ  
> http://ferret.pmel.noaa.gov/Ferret/FAQ/custom_labels/label_dates.html
> with
> REPEAT/L=588:6088:500 (LET tlab = "`T[GT=GDD1],RETURN=tstart`"; LABEL 
> `longitude` `latitude+0.025` 1 0 0.1 `tlab`)           
> However,  output on the graph is 02-JAN-2004 05:43. Since this are hourly 
> values and to improve visibility I would prefer to write only 05:43 instead 
> of 02-JAN-2004 05:43.
> I have tried with:
>
> SET MODE CALENDAR:hours
>
> but it does not work. Units atribute for time in netcdf file is
> time:units = "seconds since 2004-01-01 00:00:00"
> Ferret is 5.80
>
> Other question is perhaps simple, but I am not sure how to do it. I would also 
> like to use similar command as before to write values in the points along the 
> trackline, for example:   
> REPEAT/L=588:6088:500 (LABEL `longitude` `latitude-0.025` 1 0 0.1 SST)
> but since label command expect argument of characetr type it writes "SST" 
> instead of SST values. Is there a way to pass the value stored in the SST 
> variable as an character argument to the LABEL command? 
> I'd be thankful for any suggestions how to resolve this problems. 
> Best regards,
> Goran
>
>
>