[HOT] Connecting it all up

[Joseph Reeves]

Hi John,

I like things like this; I'm not sure if I've got anything useful for you,
but happy to talk about it. I think that routing would be a good place to
start testing.

For example, in 2009 OSM reported that it was a 7298 km drive from Cape
Town to the Kenya / Ehtiopia border. In 2010 this was reduced to 6666 km:
http://blogs.thehumanjourney.net/finds/entry/route_finding_across_a_continent

Now it comes back as 6051 km:
http://www.openstreetmap.org/directions?engine=graphhopper_car&route=-33.9157%2C18.4257%3B3.5190%2C39.0547#map=4/-22.55/19.42


According to OSM, the driving distance is roughly 17% less today than in
2009; I would imagine that the reduction in distance represents both the
building of new physical infrastructure and an improvement in OSM data.

Routing is a really easy way to look for problems in OSM, such as:
https://twitter.com/iknowjoseph/status/567719622070525953

So if you're interested in specific areas, I would suggest creating a route
and looking to improve mapping along it.

Long term, we could think of ways to conduct this analysis more
systemically. I would like to experiment with something along the lines of:


   1. Daily dump of OSM's Africa data
   2. Create 100 start points and 100 end points
   3. Daily create routes from each start to each end point
   4. Log / graph distance of each route
   5. Display each route on a map, coloured by change in daily route
   distance


Does anyone have a spare server? :)

Cheers, Joseph



On 2 November 2017 at 21:27, john whelan <jwhelan0112 at gmail.com> wrote:

> If you look at many parts of the map in Africa you can see squares of
> activity.  Often HOT projects but there are many many places where a
> tertiary or higher classified highway is fifty meters or less from
> connecting to another highway.
>
> I seem to recall in Ghana they had a project to just map the major
> highways.  This is pure infrastructure, it isn't exciting like mapping
> buildings but I suspect it would make the map a lot more usable if we could
> connect up a few more highways and I'm not even sure how you could detect
> them.
>
> Thoughts?
>
> Thanks John
>
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