[Freegis-list] origin-destnation lines

[Bernhard Reiter]

Hi Arvind,

On Fri, Feb 18, 2005 at 10:04:14PM +1100, Arvind Kumar wrote:
> I have data on origin and destinations in tabular form from a Job
> to Work Survey, which shows how many trips are made to a
> particular travel zone from different zones (one to many
> relationship), and also how many trips originate from that
> particular zone to various other zones.
> 
>  I am interested in documenting these trips graphically, with
>  lines (with attribute carrying info about number of trips). Since
>  there is a large number of zones  involved in the operation, it
>  will have to be automated. 
> 
> If you could let me know how a line can be generated between two
> points and scripts that may used to deal with larger number of
> points, I shall be grateful to you. 

I can tell you how I would approach it.
To me this looks like a visualisation problem, 
less a question of quantitative geographical analysis.

First I would do a map and then put it in a vector drawing package
like Skencil.

I would identify a one middle point per zone and save this
information somewhere for the script and then generate a nice arrow
as Skencil object with Skencil's build in python scripting
depending on the intensity of the trips.

> I am not a regular user of
> GIS, and a self taught person I this area. 
> 
> I am prepared to use ArcGIS 8.1, Arcview 3.2, Mapinfo 6.5/ 7 or
> Autodesk MAP to accomplish this, thought arcGIS is the preferred
> software.

This all is non-free software
and this email list is specific to Free Software.

> An example table is attached, I am not sure if it will go through the mail. Pl let me know if you cant read the table.
> 
> 
> Origin zone id	Destination[PARA]zone id	Frequency (number of trips)
> 1	8	23
> 3	8	13
> 4	8	3
> 6	8	33
> 1	4	12
> 3	4	14

Best,
	Bernhard
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