[Qgis-user] Finding Points which do not overlay

[henrik_f]

Hey,
So I will get right to the problem I have.
I have two different Layers with the same content from different times. Now
I want to know which points changed their location and which have been added
or deleted so I just wanted to find the points which do not overlay by using
Vector -> Geoprocessing Tools -> Difference 
(I wasnt sure if the one I was looking for was Symetrical Differnce so I
tried both)
I then realzied that not a single point was overlaying due to the fact that
the points that should have the same location were all seperated by about 3
meters.

Pictures: In the first picture you see a red point. Out of these kind of
points I want to make a new layer. The second picture is a zoomed in version
of the area highlighted in the first one.

<http://osgeo-org.1560.x6.nabble.com/file/n5162929/Pic1.png> 
<http://osgeo-org.1560.x6.nabble.com/file/n5162929/Pic2.png> 

 
Here is my question: How do I find the points which are not in distance of
3m to each other?
I made some attempts with buffers and the difference tool again but non
worked.
Does anyone have an idea?

Greetings
Henrik



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