Re: vis5d files from ferret

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

Hi Nicolas,
The Vis5D function should correctly write a positive-up variable to a v5d
file. Is your variable correct when you view it in Ferret?

You want your Z axis defined with positive coordinate values, without the 
DEPTH qualifier. Compare  these two examples (I'm not a real Vis5D
expert, to be sure I'm seeing the same slice I choose the "SOUTH" view
in v5d ):

 yes? ! Z axis positive up

 yes? def axis/x=0:100:2/units=lon xax
 yes? def axis/y=-20:20:1/units=lat yax
 yes? def axis/z/units=meters zax = 
{0,20,50,100,200,400,800,1200,2000,3000,4000,5000}
 yes? let var = x[gx=xax]/10 + y[gy=yax]/10 + z[gz=zax]
 yes? set view left
 yes? shade/y=0/title="Positive UP" var

 yes? go vis5d_write pos_up.v5d var
 yes? go vis5d_start pos_up.v5d

 yes? ! Z axis positive down

 yes? def axis/x=0:100:2/units=lon xax
 yes? def axis/y=-20:20:1/units=lat yax
 yes? def axis/z/units=meters/DEPTH zax = 
{0,20,50,100,200,400,800,1200,2000,3000,4000,5000}
 yes? let var = x[gx=xax]/10 + y[gy=yax]/10 + z[gz=zax]
 yes? set view right
 yes? shade/y=0/title="positive down" var

 yes? GO vis5d_write pos_dn.v5d var
 yes? GO vis5d_start pos_dn.v5d


Nicolas Schneider wrote:

> Dear Ferret users
>
> I would like to use Ferret to write a Vis5D-file of atmospheric 
> temperature data. Basically, I use the following command to write the 
> file:
>
> GO vis5d_write   dTemp_apr.v5d    DTEMP_APR
>
> Writing of the file then also works, but when I display the data in 
> vis5d+  (vis5d+-1.2.1) they are erroneous, i.e. they are upside-down. 
> Instead of a positive z-axis pointing upwards (atmosphere), the z-axis 
> points downwards (ocean). I also tried defining the z-axis with the 
> depth qualifiyer and afterwards turning my data in Vis5d by 180°. But 
> then, obviously, everythign is mirrored...
>
> Last October, there was a similar problem in the ferret list 
> (http://ferret.pmel.noaa.gov/Ferret/Mail_Archives/fu_2003/msg00743.html), 
> but no reply to it. Does anyone have an idea how to correctly write my 
> (atmospheric!!) data with the "vis5d_write" EF.
>
>
> Thanks for any help,
> Nicolas