Hi Henrik: If you still don't solve your issue, perhaps you can try this:
1. If you don't have it, Calculate X and Y coords. for your two layers 2. Make a table union, in layer properties 3. Create two new fields for calculate difference of coordinates (Xi - Xj) and (Yi - Yj) 4. Calculate the absolute distance between points in a new field, with the two previous. 5. This last field is your criterion about absolute difference between points. Good luck Carlos Cerdán 2014-09-19 9:35 GMT-05:00 henrik_f <henrik.felt...@gmx.de>: > 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 > > > > -- > View this message in context: > http://osgeo-org.1560.x6.nabble.com/Finding-Points-which-do-not-overlay-tp5162929.html > Sent from the Quantum GIS - User mailing list archive at Nabble.com. > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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