[Qgis-user] how to interpolate points to a grid

[Micha Silver]

On Fri, 2011-08-05 at 14:52 +0100, M.E.Dodd wrote:
> I have various layers of points from various shapes of sampling (not a
> regular rectangular grid) and want to interpolate each of them to
> produce a set of raster images.  In previous GIS I have used this was
> generally a matter of making a boundary then telling the gis the
> points layer and extent as shown by the boundary and then trying
> various interpolation methods to see which one looked most like the
> real data.  However I have yet to find suitable tools in Qgis to do
> this.  The raster grid interpolate and polygonise don’t seem to have
> suitable options and when I did try them the output looked rather
> strange and not what I was expecting as it seemed to have missed out
> much of the data.
>  
> 
> 


Did you have a look at the GRASS plugin with it's various v.surf.*
modules? That's what I usually use to interpolate i.e. an DEM grid from
point elevations.
The v.surf.rst module does best when the surface should be smoothed, and
not necessarily go exactly thru each point.


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