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How can I show the flow coming from an Origin-Destination matrix as desire lines? I need a result like the one in the picture below.

desire lines

I need to scale them proportionally to its value (coming from a linked MDB) and I like that the lines are a bit curved (but I can use straight lines too).

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Have you already created the linework and just need to symbolize the lines, or do you need to create the linework as well? – RyanDalton Jun 20 '13 at 17:55
Closely related: Curved point-to-point route maps. – whuber Jun 20 '13 at 18:04
possible duplicate of How can I map a matrix of origins and destinations in QGIS? – RyanDalton Jun 20 '13 at 18:16
This question is unique and should remain open because the OP is asking how to scale the flow lines proportional to values in addition to inquiring about curved flow lines. – Aaron Jun 20 '13 at 19:21
@Aaron, thanks for that clarification, I missed it. – matt wilkie Jun 20 '13 at 23:06
up vote 14 down vote accepted

Try using the QGIS plugin Flowmapper. The attached image is a sample from the plugin documentation.

enter image description here

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That's a very cool plugin. – Radar Jun 20 '13 at 20:08
That's it, thanks – Ale Oct 4 '13 at 13:24

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