[Freegis-list] origin-destnation lines
bernhard at intevation.de
Thu Feb 24 19:05:37 CET 2005
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
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
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
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