Re: Landmasking

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

Hi Rolando,
There is no pre-defined mask. You can define a mask as you
wish, for instance, if you have data on a lat-lon grid,

yes? use mydata   ! a dataset with some variable, myvar
yes? let var = myvar[d=mydata]
yes? use etopo20
yes? let mask = if rose[g=var] lt 0 then 1    ! There is an implied 
"else missing"

yes? shade mask * var

This will put the topography data on the same grid as your data,
and shade only the data where the elevation is less than 0.

Ansley Manke

Rolando S. Balotro wrote:

> Hello All
>
> What is the value prescribed by ferret for landmasking?
>
> thanks in advance
> roland
>
> Ansley Manke wrote:
>
> > Hi Zibiao,
> > This is "regridding".  You will define the daily time axis that you 
> > want, and
> > use a regridding operation to put the hourly data onto it.  If you 
> > look in the
> > Users Guide index under "average, @ave regridding"  you will get the
> > right information.
> >
> > A general suggestion as you learn to use Ferret is to read the first 
> > chapter
> > of the Users Guide, and then scan chapters 2-4 and 6 to get an idea 
> > of the
> > topics that are there.  Happy Ferreting!
> >
> > Ansley Manke
> >
> > Zibiao Zhang wrote:
> >
> > > Hi All,
> > >
> > > I have trouble to average the hourly data records into daily data 
> > > record in cdf file.
> > > I could not find the hint from the manual, anyone could help me out 
> > > please?
> > > Thanks.
> > > Zibiao
> > >
> > > -----Original Message-----
> > > From: Ansley Manke [mailto:ansley.b.manke@noaa.gov]
> > > Sent: Wednesday, April 07, 2004 2:44 PM
> > > To: Zibiao Zhang
> > > Cc: Ferret users
> > > Subject: Re: how to handle a figure?
> > >
> > >
> > > Hi,
> > > The topics to look up in the Users Guide are "hard copy"  and "gif 
> > > image".  We will
> > > add some more index entries to make this information easier to find.
> > >
> > > Ansley Manke
> > >
> > > Zibiao Zhang wrote:
> > >
> > >  
> > > > Hi all, after plot a figure, how to export or save the figure as 
> > > > the any figure type file?
> > > > thanks,
> > > >
> > > >
> > > >   
> > >
> > >