[Qgis-user] QGIS - interpolation for ground elevations

[Alexandre Neto]

Hello Francesco,

What type of data is the junctions layer?

Is it a vector layer with points?
You want to attribute a evelation to each of the points?

If it is, you are not using the correct tool. In the plugins, search for a
plugin called point sample. That's what you need.

Good luck,

Alexandre Neto
Em 17/10/2014 15:16, "Francesco Liva" <fr.liva at gmail.com> escreveu:

> Hi
> I am not an expert QGIS user, I have downloaded a map from USGS, have
> created a raster file with Raster > Extraction > Clipper.
>  In a layer called *Junctions* I want to add elevations automatically
> from this raster file, by Plugins > Raster interpolation. It seems it is
> working, there is a message saying that the data have been updated. But in
> reality no data is  updated and the following error message appears:
>
> Traceback (most recent call last):
>   File
> "/Users/francescoliva/.qgis2/python/plugins/rasterinterpolation/qgiscombomanager/layercombo.py",
> line 102, in __canvasLayersChanged
>     for layerId, layer in
> QgsMapLayerRegistry.instance().mapLayers().iteritems():
> AttributeError: 'NoneType' object has no attribute 'instance'
>
> Moreover When I open the Plugins > Raster interpolation, the window is
> not showing all layers, one layer called Junctions_3 is not appearing.
>
> Can you help me, thankyou
>
> Best Regards
> Francesco Liva
>
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