[gradsusr] Vertical cross sections, topography and displaying levels

[Davide Sacchetti]

if your vertical coord is pressure then you can plot pressfc.
The trick is this:
1) set lev 1000 100 (ex)
2) display something (ex: u;v)
3) get parea settings ('q gxinfo')
4) set parea to previous settings (now you want to plot 1D data (level
is fixed) while in previous u;v the level was varying: default PlotAREA
are different)
5) set y range to 1000 100 (set vrange 100 1000; set yflip on)
5) display PRESsfc

if you want to plot 1.5PVU level you can do the same but the field you
need is the pressure of 1.5PVU

hoping it can help ...
bye bye
Davide

On Wed, 2011-08-10 at 15:44 +0200, Fred - GMT wrote:
> Hi,
> 
> I'm using Grads to display vertical cross sections. I'd like to display 
> grey area below a defined level of pressure (determined by the parameter 
> PRESsfc). How can I do that?
> On the cross sections, I want display a line representing the position 
> of a parcel ; for example 1,5PVU. But I have this error :
> > Data Request Warning:  Varying Z dimension environment...
> >   but the requested variable has no Z dimension
> > Cannot contour grid - all undefined values
> Indeed, the parameter does not vary with altitude. How to display it ?
> 
> Thank you !
> Fred
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> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
> 
> 

-- 
--> Attenzione cambio indirizzo: davide.sacchetti at arpal.gov.it
--
Davide Sacchetti
Centro Funzionale Meteo Idrologico di Protezione Civile della Regione Liguria
ARPAL Unità Tecnica Complessa di livello Regionale
V.le Brigare Partigiane 2 16121 Genova (I)
tel: +39 010 6437535                    fax: +39 010 6437520
mail: davide.sacchetti at arpal.gov.it     web: www.meteoliguria.it