[HOT] Ebola outbreak, #672

Pierre Béland pierzenh at yahoo.fr
Tue Oct 7 16:29:25 UTC 2014

Hi Aytoun,

Adding to Dan's comments. 

What to do when you see an offset with the imagery

If the village have a 30 meter offset with the rest of the world, we can 
live with this. But in the village we are careful to respect the general geometry, alignment and distances between the respective buildings and 

With JOSM, you can simply slide the imagery to adjust from what is already traced before you start to add anything.

 De : Dan S <danstowell+osm at gmail.com>
À : AYTOUN RALPH <ralph.aytoun at ntlworld.com> 
Cc : "hot at openstreetmap.org" <hot at openstreetmap.org> 
Envoyé le : Mardi 7 octobre 2014 12h25
Objet : Re: [HOT] Ebola outbreak, #672

Hi Ralph,

I just had a quick check, and it all looks quite well aligned to me. I
also enabled the GPS traces overlay, and from my point of view (just
looking at the town centre, using iD) I see pretty good match between
osm, gps, and imagery. So I don't know why I'm not seeing the problem
you're seeing. But maybe you could check if the GPS trace overlay
matches OSM data and/or bing data for you?


2014-10-07 17:11 GMT+01:00 AYTOUN RALPH <ralph.aytoun at ntlworld.com>:
> Hi all,
> I have opened the following square 153 for the task #672 Ebola Outbreak,
> Port Loko, Bombali district, road network
> http://tasks.hotosm.org/project/672#task/153
> containing the town Makeni. This square has been worked on and amended at
> various stages in the past few years.
> What I am finding is quite a big offset to the existing Bing background
> imagery and road patterns in the town that do not  fit to the imagery and
> have many variations that do not conform to the imagery.
> I have checked the history and nothing indicates any official fixed
> positioning (GPS trace) or source.
> Do I amend the roads to conform to the latest (2014) Bing imagery or leave
> it as is?
> Can anyone advise me on this?
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