> 
> I imagine some of you have done this before:
> 
> I have a digitized contour map that I want
> to turn into a DEM. I rasterized the contours
> with v.to.rast, which worked fine, and now want 
> to interpolate all the cells between the contours.
> 
> I am trying to use r.surf.idw2 to do this,
> but I have two questions:
> 
> 1. Is this the best way to do this? I expect
> some strange results using r.surf.idw2, because
> for cells near a contour, all the nearest cells
> used in the interpolation will have the same
> value, so the interpolated cell will just be 
> assigned the same value as the nearby contour.
>
 
You should also look at r.surf.contour and s.surf.tps, both methods
of surface construction.

> 2. I launched r.surf.idw2 yesterday on a SPARC 10,
> and it is still working this morning. The map is
> 834 by 989. How long is this going to take? 
>

It should have been finished by now. Did you make the interpolation
very involved (like using the nearest 24 points) ?
 
> Cheers,
> 
> Bob Harrington
> Hydrology and Water Resources
> University of Arizona
> 


