[Tagging] Tagging 'averaged' paths in rural Mali

John F. Eldredge john at jfeldredge.com
Mon Feb 11 01:06:54 UTC 2013


Martin Koppenhoefer <dieterdreist at gmail.com> wrote:

> 2013/2/10 william skora <skorasaurus at gmail.com>:
> > Hey everyone,
> >
> > As you may know, HOT is currently mapping infrastructure in Mali. In
> flat
> > rual areas, there are
> > some 'highways' (unpaved ground) that are very close to each other
> (up to
> > ~100 meters ) that all lead to the same villages or destinations.
> >
> > Here is one example: http://binged.it/Y2XLqR
> >
> > We have generally traced these like we have with GPX without
> satellite; one
> > average trace of the possible paths (since no one way is really more
> > important thatn the others). So we would like some sort of tag to
> add
> > additionally to not that in addition to being a highway=whatever
> this road
> > is not a simple centerline, but rather just an average and you
> shouldn't try
> > to follow it exactly (or necessarily expect to be able to follow it
> > exactly). As Andrew Buck in #hot noted, 'they are useful for
> understanding
> > the level of economic development in the area since they are
> sometimes
> > caused simply by the lack of someone actually building road
> (although in
> > most cases it just doesn't even make sense to build one)'.
> >
> > Do you have any suggestions of how to tag these ways ?
> 
> 
> IMHO in first approximation it would be OK to simply draw one of these
> (to create the connection, the most useful part) and eventually in a
> later state you could add more of them. The fact that they run
> parallelly doesn't mean each of them isn't a (high)way which could be
> mapped on its own.
> 
> cheers,
> Martin
> 
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I agree that it would make sense to map all of them.  After all, in a city with streets arranged in a grid, streets run parallel to each other, often less than 100 meters apart, and offer multiple routes to reach the same approximate destination, yet we map all of them, not an "average" route that doesn't correspond exactly to any of them.  Now, if you were mapping footpaths separated by only a meter or two, mapping an averaged path would make more sense.

-- 
John F. Eldredge -- john at jfeldredge.com
"Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria



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