grid rotation

Hi

I have a global 2-D 1deg_x_1deg scalar field with missing data and I
would like to fill the gaps. I discovered the function poisson_grid_fill
and would like to use it. However, I'm mostly interested in the Arctic
region and since at the Pole the boundaries are closed it does not use
data from across the Pole to interpolate. I thought that maybe I could
rotate the whole grid, so that the North Pole would be somewhere near
the Equator.

I found in the archives several discussions about changing the Pole
location for plotting (i.e., CenterLonF,..) but not for calculating. Is
there a simple way to do it without having to code the whole coordinate
transformation?

Thanks a lot,
Jan

-- 
Jan Sedlacek, Ph.D.
ETH Zürich
Institute for Atmospheric and Climate Science
CHN N18
Universitätstrasse 16
8092 Zürich, Switzerland
Phone:  +41 44 632 7709
Fax: +41 44 632 1058
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