Or you could use v.distance from GRASS (either through Processing or the QGIS-GRASS plugin): http://grass.osgeo.org/grass64/manuals/v.distance.html
With the “output”-option it produces lines. Cheers Stefan From: qgis-user-boun...@lists.osgeo.org [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Alexandre Neto Sent: 10. mars 2015 10:32 To: Raymond Nijssen Cc: QGIS User Subject: Re: [Qgis-user] Fwd: Visualize Distance matrix If your data is in a Spatialite or a Postgis database, it's quite easy to achieve what you seek. All you need to do is create a SQL query similar to this one in DB Manager: SELECT a.gid as dep_id, b.gid as dest_id, ST_Distance(a.geom, b.geom) as distance, ST_MakeLine(a.geom, b.geom) as geom FROM my_table as a, my_table as b WHERE a.gid > b.gid Note: This is the postgis version, not sure if the same function applies to spatialite Add it to the map canvas by using dep_id as unique value column and geom as geometry column. Hope it helps. Alexandre Neto On Tue, Mar 10, 2015 at 8:08 AM, Raymond Nijssen <r.nijs...@terglobo.nl<mailto:r.nijs...@terglobo.nl>> wrote: Hi Joris, I dont know about that plugin, but i would write a little script for that like this: # get active (point) layer as input inputlayer = iface.activeLayer() # create new memory layer for output outputlayer = QgsVectorLayer("Linestring", "distance_lines", "memory") outputprovider = outputlayer.dataProvider() # loop all points iter = inputlayer.getFeatures() for feature in iter: p1 = feature.geometry().asPoint() iter2 = layer.getFeatures() for feature2 in iter2: p2 = feature2.geometry().asPoint() if not p1 == p2: # create new line l = QgsGeometry.fromPolyline([p1,p2]) feat = QgsFeature() feat.setGeometry(l) outputprovider.addFeatures([feat]) outputlayer.commitChanges() outputlayer.updateExtents() # add to map QgsMapLayerRegistry.instance().addMapLayer(outputlayer) Good luck, Raymond On 09-03-15 18:18, Joris Hintjens wrote: Thanks Raymond, but what I need is the distance from every point in a layer to every other point. That is what “distance matrix” gives me. Then, I want to plot every distance line (as a seperate layer?) on the map. Joris Begin doorgestuurd bericht: Datum: 9 maart 2015 15:53:56 CET Van: Raymond Nijssen <r.nijs...@terglobo.nl<mailto:r.nijs...@terglobo.nl>> Aan: qgis-user@lists.osgeo.org<mailto:qgis-user@lists.osgeo.org> Onderwerp: Antw.: [Qgis-user] Visualize Distance matrix Hi Joris, Not sure if I understand your question, but if you want to do a distance calculation for all points in a point layer to a certain location you can use the field calculator in the attribute table window. The expression should be: distance($geometry ,geomFromWKT( 'POINT(0 0)' )) to calculate all distances to coordinate 0,0. Hope this helps you. Raymond On 09-03-15 15:13, Joris Hintjens wrote: I feel stupid: I am stuck with what seems a basic operation.. I have a points layer, of which I want to visualize the distance matrix. I can create the martini CSV. I cannot create a distance hub layer with the MMQGIS plugin with From and To point from within the same layer. Any help on how I ca get this result on my map? PoinA——————>PointB xxx Meter and this for the entire matrix thanks Joris _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org<mailto:Qgis-user@lists.osgeo.org> http://lists.osgeo.org/mailman/listinfo/qgis-user -- Terglobo Ampèrestraat 110 5223 CT 's-Hertogenbosch 06-25314983 _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org<mailto:Qgis-user@lists.osgeo.org> http://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org<mailto:Qgis-user@lists.osgeo.org> http://lists.osgeo.org/mailman/listinfo/qgis-user -- Terglobo Ampèrestraat 110 5223 CT 's-Hertogenbosch 06-25314983 _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org<mailto:Qgis-user@lists.osgeo.org> http://lists.osgeo.org/mailman/listinfo/qgis-user
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