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. > -- > The Open University is incorporated by Royal Charter (RC 000391), an > exempt charity in England & Wales and a charity registered in Scotland > (SC 038302). > > This mail was received via Mail-SeCure System. > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user > > This mail was received via Mail-SeCure System. > >
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