horizontal divergence (hdivg)

[Ricardo Hallak]

Hi, John.

The problem here is that the hdivg function calculates the horizontal divergence in "central finite difference", so that it must indeed loss boundary informations. Remember that finite differences take data from neighboring points to calculates a value in the central point. As the grid boundaries don´t have neighboring points beyond the grid, grads uses "no data" values at the boundaries.

Greetings,

Ricardo

On Wed, 13 Jun 2007 22:15:12 -0600, John Guhin wrote
> Hi,
>       I am trying to compute horizontal divergence using the function hdivg(u,v). It seems like it cannot compute at the boundaries. In all other places it is working fine. How can I get rid off  this problem?
>
> thanks in advance.
>
> --
> John Guhin

Hallak

Laboratório de Hidrometeorologia (LABHIDRO)
Departamento de Ciências Atmosféricas (DCA)
Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG)
Universidade de São Paulo (USP)
Rua do Matão, 1226 - Cidade Universitária -São Paulo SP -05508-900
Fone.: +55 (0-XX-11) 3091-4735
Fax: +55 (0-XX-11) 3091-4714


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