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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">My suggestion would be to create a buffer of 3m around your original points. (vector/geoprocessing/buffer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">That creates a new vector table. (vector Buffer)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Load the new vector table is it isn’t already<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Then do a spatial query select source features from: new points table<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Where the feature: within<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Reference features of : vector buiffer
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Open the attributers table of you new points table then click on the invert selection button (yellow triangle with two green arrows
in a circle.)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Should give you all the points that have moved, assuming that your original points were more than 3 metres apart.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Then if you want them as a separate table, just edit/copy<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Then edit/paste features as<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Damien<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif""> qgis-user-bounces@lists.osgeo.org [mailto:qgis-user-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Carlos Cerdán<br>
<b>Sent:</b> Tuesday, 23 September 2014 3:44 AM<br>
<b>To:</b> henrik_f<br>
<b>Cc:</b> qgis-user@lists.osgeo.org<br>
<b>Subject:</b> Re: [Qgis-user] Finding Points which do not overlay<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hi Henrik:<br>
<br>
If you still don't solve your issue, perhaps you can try this:<br>
<br>
1. If you don't have it, Calculate X and Y coords. for your two layers<br>
<br>
2. Make a table union, in layer properties<br>
<br>
3. Create two new fields for calculate difference of coordinates (Xi - Xj) and (Yi - Yj)<br>
<br>
4. Calculate the absolute distance between points in a new field, with the two previous.<br>
<br>
5. This last field is your criterion about absolute difference between points.<o:p></o:p></p>
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<p class="MsoNormal">Good luck<br>
<br>
Carlos Cerdán<o:p></o:p></p>
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<p class="MsoNormal">2014-09-19 9:35 GMT-05:00 henrik_f <<a href="mailto:henrik.feltens@gmx.de" target="_blank">henrik.feltens@gmx.de</a>>:<o:p></o:p></p>
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<p class="MsoNormal">Hey,<br>
So I will get right to the problem I have.<br>
I have two different Layers with the same content from different times. Now<br>
I want to know which points changed their location and which have been added<br>
or deleted so I just wanted to find the points which do not overlay by using<br>
Vector -> Geoprocessing Tools -> Difference<br>
(I wasnt sure if the one I was looking for was Symetrical Differnce so I<br>
tried both)<br>
I then realzied that not a single point was overlaying due to the fact that<br>
the points that should have the same location were all seperated by about 3<br>
meters.<br>
<br>
Pictures: In the first picture you see a red point. Out of these kind of<br>
points I want to make a new layer. The second picture is a zoomed in version<br>
of the area highlighted in the first one.<br>
<br>
<<a href="http://osgeo-org.1560.x6.nabble.com/file/n5162929/Pic1.png" target="_blank">http://osgeo-org.1560.x6.nabble.com/file/n5162929/Pic1.png</a>><br>
<<a href="http://osgeo-org.1560.x6.nabble.com/file/n5162929/Pic2.png" target="_blank">http://osgeo-org.1560.x6.nabble.com/file/n5162929/Pic2.png</a>><br>
<br>
<br>
Here is my question: How do I find the points which are not in distance of<br>
3m to each other?<br>
I made some attempts with buffers and the difference tool again but non<br>
worked.<br>
Does anyone have an idea?<br>
<br>
Greetings<br>
Henrik<br>
<br>
<br>
<br>
--<br>
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