[talk-au] City routing grid for Australia and the US

Leon Kernan lkernan at gmail.com
Sat Jul 28 01:16:53 BST 2012


Hi, I've found an issue with this that will stop the Perth - Adelaide
results ever being green.
Google routes via a ferry across the Spencer Gulf, which gives it an
advantage.
Otherwise OSM is routing perfectly via Port Augusta, it's just longer than
the Google results.


On Sun, Jul 22, 2012 at 4:32 AM, Kai Krueger <kakrueger at gmail.com> wrote:

> Hello everyone,
>
> Inspired by the US 250 cities routing grid[1] used in the original TIGER
> cleanup in 2009, I have now created a similar routing grid for the USA
> and Australia.
>
> Australia: http://apmon.dev.openstreetmap.org/aus_routing_grid.html
> USA: http://apmon.dev.openstreetmap.org/us_routing_grid.html
>
> It takes the top cities of the country and calculates the routing
> distances between them and displays the result in a routing grid. It
> allows to check the top tear inter city road network. Unusually long
> routes are likely caused by broken data and indicates where things need
> fixing.
>
> In the grid, all routes that are more than 5% longer or slower than
> expected* are show in red, otherwise they are considered as
> superficially OK. The reference values are in brackets. If you click on
> the link, you will be sent to the detailed routing information.
>
> Unfortunately the situation, particularly in Australia, is pretty bad.
> In Australlia currently non of the routes between the top ten cities
> pass this criterion and in fact most of the routes can't be calculated
> at all any more due to disconnectedness of the road network.
>
> So for all those who are finished remapping their own area and are
> looking to help with a bit of armchair mapping, trying to get more of
> these routes green could be a good idea for arm chair mappers. Let's see
> how quickly we can get all of them green!
>
> The routing information is calculated using the Open Source Routing
> Machine ( http://map.project-osrm.org/ ) and if I am not mistaken,
> updates its data once a day. I will equally try and recreate those grids
> on a daily basis to help track progress on the remapping.
>
> Happy remapping,
>
> Kai
>
> * The time and distance that is expected is currently determined using
> google's directions API. Although not perfect by any means, it is
> probably the most reliable source for now as a reference.
>
>
>
> [1] http://wiki.openstreetmap.org/wiki/TIGER_fixup/250_cities/routing_grid
>
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