[Qgis-user] Help in using Grass plugin to interpolate point data

[pieri70]

Hello list
I'm looking for some help for interpolation of point data values with qgis.
I use to interpolate data with spline techniques, so I'm trying to use the
grass plugin (v.surf.bspline).
After the creation of a grass mapset the grass tools are available, I found
the module v.surf.bspline but if I click on this module I face a mask asking
for a vector in input.
On my qgis project there are 2 point layers, one coming from a shp file and
another from a spatialite db.
Both of them aren't available on the dropdown list of the module mask.
I'm a beginner with this tools so be patient, where is the mistake?

May be the grass plugin (v.surf.*) need a grass vector layer in input?
Right?
So, I must convert a shp to grass vector and then perform interpolation, no
other more direct way to do this?

Thanks
Pietro

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