[IDV #FXH-373138]: Request for a help

> Hi Yuan,
> 
> Thanks for your help. I was able to make the difference. However I need one
> more help; one of the grid maps is larger than other grid maps in spatial
> extent; so when I make difference large differences are shown for the grids
> where one of the maps do not have any grid value. How I can mask those
> large difference values?
> 
> 
> Regards, Tapash
> 

When making difference between two different domains, you need to resample the 
large domain to the small domain before the calculation.
There is a build in formula resampleGrid(largeGrid, smallGrid) can be used in 
your case.

Yuan
> 
> Ticket Details
> ===================
> Ticket ID: FXH-373138
> Department: Support IDV
> Priority: Normal
> 
> 
> 
> address@hidden> wrote:
> 
> > > Hi,
> > >
> > >
> > >
> > > I am trying to subtract a netCDF grid map from another netCDF grid map to
> > > produce a difference netCDF grid map in the IDV. I am using "Layer
> > > Difference" from Data -> Formulas -> Grids at the Dashboard, but
> > apparently
> > > I am able to get success.
> > >
> > >
> > >
> > > Would you please point me how I can produce a difference grid map from
> > two
> > > grid maps? I am using IDV version 4.0u1.
> > >
> > >
> > >
> > > I really appreciate your help.
> > >
> >
> > Hi Tapash,
> >
> >     Please reference the tutorial document:
> >
> >
> > https://www.unidata.ucar.edu/software/idv/docs/workshop/formulas/SimpleFormulas.html
> >
> >
> > Yuan
> > >
> > >
> > > Thanks lot.
> > >
> > >
> > >
> > > Regards, Tapash
> > >
> > >
> >
> > Ticket Details
> > ===================
> > Ticket ID: FXH-373138
> > Department: Support IDV
> > Priority: Normal
> > Status: Closed
> >
> >
> 
> 


Ticket Details
===================
Ticket ID: FXH-373138
Department: Support IDV
Priority: Normal
Status: Closed