[Numpy-discussion] Vector interpolation on a 2D grid

[Pierre GM]

All,
I have a vector of observations (latitude,longitude,value) that I need  
to interpolate over a given area.
So far, I used Jeff W's basemap to transform the lat/lon in arbitrary  
x/y and construct a regular grid, Robert K's delaunay triangulation  
routine to project the points on the grid and its nearest-neighbor  
interpolator to get a 2D array of estimates.
Have a look for yourself at http://grab.by/gY3
Some colleagues complained that the result looked a bit too choppy,  
meaning that too much weight was given to the actual observations.
What are my other options ?
Thx in advance for any idea
P.