[gradsusr] fish_psi apply to localized domain

[Arlindo da Silva]

On Tue, Feb 15, 2011 at 8:04 PM, Ting-Chi Wu <twu at rsmas.miami.edu> wrote:

> Hi,
>
> I tried to use* "fish.gex" (GrADS Extension Library for Calculating
> Streamfunction/Velocity Potential*) to calculate streamfunction from known
> u and v fields. I read through the website here:
> http://opengrads.org/doc/udxt/fish/fish.html
> It looks like this function can only apply to global lat/lon domain.
>

True. Solving the poisson equation on a local domain is trickier because you
need to specify boundary conditions.


> My data is in lat/lon coordinate already, but it is not global since my
> data is output from mesoscale model.
> Whenever I used fish_psi(u,v) to get streamfunction, I get error messages
> "error from fish: rc=1000"
> I tried to narrow down my lat and lon range, and it still doesn't allow me
> to calculate.
> Does anybody know how should I deal with it?
>

Sorry, fish requires a global domain.

   Arlindo


-- 
Arlindo da Silva
dasilva at alum.mit.edu
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