Hello Matt,

> Does anyone have any information on how to draw contours, interpolated in a 
> linear fashion from point data ? For example to show areas of differing air 
>quality...

I'd go for the VM2 solution. It does a beautiful job of contouring (regions or 
polylines) through an 
interpolated point data set. You may find bits and pieces around which may help with a 
free 
solution, but VM2 offers the complete functional package.

Since you're in the UK, I'd be happy to run a sample of your own data through it and 
send back the 
contour results.

Regards,
Warren Vick
Europa Technologies Ltd, U.K.
www.europa-tech.com
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