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I'm trying to map the volume of people traveling from various cities to popular mountain towns in British Columbia. I have a .csv containing the starting point, ending point and number of travelers. There must be a way to show the volume of travel (thickness of line, or colour coded) from place to place using city layer polygons and a road network layer. Any help would be much appreciated! Thanks! CHeers, Luke

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Welcome to SE.GIS forum. Which software you are using to show the map? for ex. QGIS or ArcGIS thanks.. –  Sunil Apr 25 '13 at 6:08
    
To add to what @Sunil is saying, you can also do it with Google Earth or a web interface. But we need to know your platform. If you don't have one, then please indicate that as well –  dassouki Apr 25 '13 at 14:22
    
i am using qgis –  user17543 Apr 25 '13 at 21:42
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marked as duplicate by whuber Apr 25 '13 at 14:25

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We have done so using our RW Net 4 package for calculating flow from your CSV-data and then used line thickness for illustration of volume. In this example all flows are from a single location: http://www.routeware.dk/wordpress/?p=61

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Which algorithms are you guys using for Route assignment? –  dassouki Apr 25 '13 at 14:23
    
We are using A*. –  Uffe Kousgaard Apr 25 '13 at 15:24
    
I dont really care about the route, as travel is over a considerable about of distance with limited route options. I am using QGIS, is there a to do that in this? –  user17543 Apr 25 '13 at 21:50
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