Have you given a look at FlowMapper plugin? http://plugins.qgis.org/plugins/FlowMapper/
Here you can find an example, without using the plugin but only a PostGIS layer. giovanni Il 20/nov/2013 22:39 "Tim Michelsen" <timmichel...@gmx-topmail.de> ha scritto: > > Graphviz (http://www.graphviz.org/) will do most of what you > > described, but I don't think you can specify the coordinates of the > > nodes (that would be nice) so the result is just a diagram, not a map . > Not exactly. > > Via > Representation of network flows / > http://gis.stackexchange.com/questions/778/representation-of-network-flows > > I found JFlowMap. > > It uses the approach I described: > https://code.google.com/p/jflowmap/wiki/HowToPrepareData > > I just don't know if it can also export to shape... > > > [question off-list:] > > do you mean something that just draw the lines or that will > create/manage actual line features? > A line drawing tool which would allow to maintain connections of lines > if nodes are shifted. > > The background for all is that the simlation and design tools for > networks can export lines (e.g. power lines, telecom lines) or nodes as > lists but no logical structure. > A typical schema: > http://en.wikipedia.org/wiki/File:Electricity_Grid_Schematic_English.svg > http://en.wikipedia.org/wiki/File:One-line_diagram.svg > > So I wonder how others are transferring such information into the > GIS/geo domain. > > Regards, > Timmie > > > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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