<p dir="ltr">Hello Francesco,</p>
<p dir="ltr">What type of data is the junctions layer? </p>
<p dir="ltr">Is it a vector layer with points?<br>
You want to attribute a evelation to each of the points? </p>
<p dir="ltr">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.</p>
<p dir="ltr">Good luck,</p>
<p dir="ltr">Alexandre Neto</p>
<div class="gmail_quote">Em 17/10/2014 15:16, "Francesco Liva" <<a href="mailto:fr.liva@gmail.com">fr.liva@gmail.com</a>> escreveu:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><span style="font-size:14px">Hi </span><div><span style="font-size:14px">I am not an expert QGIS user, I have downloaded a map from USGS, have created a raster file with Raster > Extraction > Clipper.</span></div><div><span style="font-size:14px"> In a layer called <b>Junctions</b> 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:</span></div><div><span style="font-size:14px"><br></span></div><div><div style="margin:0px"><span style="font-size:14px">Traceback (most recent call last):<br>  File "/Users/francescoliva/.qgis2/python/plugins/rasterinterpolation/qgiscombomanager/layercombo.py", line 102, in __canvasLayersChanged<br>    for layerId, layer in QgsMapLayerRegistry.instance().mapLayers().iteritems():<br>AttributeError: 'NoneType' object has no attribute 'instance'</span></div><div style="margin:0px"><span style="font-size:14px"><br></span></div><div style="margin:0px"><span style="font-size:14px">Moreover When I open the </span><span style="font-size:14px">Plugins > Raster interpolation, the window is not showing all layers, one layer called Junctions_3 is not appearing.</span></div><div style="margin:0px"><span style="font-size:14px"><br></span></div><div style="margin:0px"><span style="font-size:14px">Can you help me, thankyou</span></div><div style="margin:0px"><br></div><div><span style="border-collapse:separate;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="color:rgb(0,0,0);font-family:Helvetica;word-wrap:break-word"><span style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><span style="border-collapse:separate;color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><div style="word-wrap:break-word"><div style="word-wrap:break-word"><div style="word-wrap:break-word"><div><font color="#000000"><font><font face="'Times New Roman'" size="5">Best Regards</font></font></font></div><div><font color="#000000"><font><font face="'Times New Roman'" size="5">Francesco Liva</font></font></font></div><div><font color="#0000FF"><span style="text-decoration:underline"><br></span></font></div><div><font color="#0000FF"><span style="text-decoration:underline">______________________________</span></font></div></div></div></div></div></span></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span><div style="color:rgb(0,0,0);font-family:Helvetica;word-wrap:break-word"><span style="border-collapse:separate;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><div style="color:rgb(0,0,0);font-family:Helvetica"><font color="#00009E"><font face="'Century Gothic'">27, Triq Ix-Xatt, Kalkara, Malta</font></font></div></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div><span style="color:rgb(0,0,158);font-family:'Century Gothic';font-size:12px">☎ +356 99 38 01 68 mobile</span><div style="color:rgb(0,0,0);font-family:Helvetica"><font color="#00009e" face="'Century Gothic'"><span style="font-size:12px">☎ +356 27 32 76 78 home</span></font></div><div style="color:rgb(0,0,0);font-family:Helvetica"><font color="#00009e" face="'Century Gothic'"><span style="font-size:12px"><br></span></font></div><span style="border-collapse:separate;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="border-collapse:separate;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px"><div style="word-wrap:break-word"><span style="color:rgb(0,0,0);font-family:Helvetica;border-collapse:separate;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:norma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