Smooth interpolation for sparce data set from a gridded data set

From: "Raphael Vilamiu" <raphaelvilamiu@xxxxxxxxxxxx>
Date: Sat, 29 Apr 2006 17:36:42 -0400

I need to interpolate a smooth hypersurface for a sparse selection of
a gridded data set. Actually, the local maximas and minimas of this
set.

The Matlab function that does this is griddatan. But it is not smooth
- the options are: linear or nearest. The other option is interpn.
But it does work just when someone want to interpolate a hypersurface
trough a gridded subset from another gridded set.

How may I interpolate a smooth surface trough some sparse data points
from a gridded data set?

Thanks in advance,

Raphael Vilamiu
.

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