Re: [HOT] [OSM-talk] A tool for picking up settlements tagged as a single building?

[Jean-Marc Liotier]

On Sat, 25 Mar 2017 13:25:35 -0400
john whelan  wrote:
>
> It's something I've noticed in Africa so its probably not putting new
> mappers through a month's training first but many villages have been
> mapped but tagged as a single building with building=yes.
> 
> They aren't grouped together but rural Africa doesn't have that many
> large foot print buildings so it should be possible to pick them out
> based on location and size.

And by the way, if you wonder why a bunch of buildings are tagged as
building=yes when that tag is meant for single buildings, I received a
possible answer from Senegalese contributors: some have been taught to
tag built-up areas and found that building=yes looks like a good choice
to do that. The source of that teaching of a need to map built-up areas
seems to be non-Openstreetmap cartography courses.

And while we're at it, the next most frequent building tagging mistake:
outlining the building on orbital imagery at roof level instead of base
level... Explaining that pictures are not always taken from the
vertical usually drives the point home.

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Re: [HOT] [OSM-talk] A tool for picking up settlements tagged as a single building?

[Martin Koppenhoefer]

2017-03-27 11:56 GMT+02:00 Jean-Marc Liotier :

> And while we're at it, the next most frequent building tagging mistake:
> outlining the building on orbital imagery at roof level instead of base
> level... Explaining that pictures are not always taken from the
> vertical usually drives the point home.
>


btw., there is an extensive article about this, with many examples, in the
wiki here:
https://wiki.openstreetmap.org/wiki/Roof_modelling

Cheers,
Martin
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Re: [HOT] Volunteer Opportunity w/ AmCross

[Celina Agaton]

Hi Rachel,

We work with local talent that fulfill your qualifications. Could the
travel stipend go towards paying a local person a fair wage and contribute
to the project?

Celina

On Tue, Mar 21, 2017 at 11:55 PM Rachel Levine 
wrote:

> Hi All,
> Know drones? Interested in Red Cross humanitarian work? We're looking for
> a volunteer to join us on an upcoming trip to the Philipines! Dates TBD but
> will be 2-3 weeks in April with remote follow up.  Please email
> rachel.lev...@redcross.org or daniel.jos...@redcross.org with any
> questions.
> Best,
> Rachel
>
> Please check out this link for more info:
> https://github.com/AmericanRedCross/jobs/blob/master/uav-volunteer.md
>
> To Apply:
> Please create an account and submit your application here:
>
> https://volunteerconnection.redcross.org/?nd=vms_volunteer_opportunity_detail_id=113845_jid=29447284
>
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-- 


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   Twitter @celinaagaton 
   Skype: celinaagaton
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Re: [HOT] Mapswipe - whats happening with the data?

[joost schouppe]

Yes, Mapswipe is powerful indeed. Pete described the processing for Sierra
Leone. It didn't just result in "less work for the mapper", it also made
the mapping work itself possible for new mappers. We finished these tasks
(2664, 2680, 2710, 2711, 2712) before breakfast (well, almost) during our
Belgian National Mapathon this weekend. Almost all of them were new mappers.

In many tasks, previous mappers will have added some or all needed data,
but not mark the tile as done in the tasking manager. Or they look at a
huge patch of (African) satellite picture for the first time, and don't
find anything to map. This is all very confusing to a new mapper. In this
case, that was avoided, because we could focus on areas that we know were
empty AND have something to map.

There will be some write-ups about our big mapathon, and it might be worth
push-notifying something about how Mapswipe is used in practice to the
Mapswipe contributor, through the app. It is not enough to do cool stuff,
people need to really know they're making cool stuff possible :)

One thing that is up for improving, is that the preprocessing sometimes
results in miniscule tasks. It looks really strange and it is confusing for
users (an example: http://tasks.hotosm.org/project/2664#task/340). Just a
matter of using a slightly different processing. From what I see, I would
guess that the mapswipe work is used to create arbitrary polygons of
"please map me areas". Then they are split up according to some standard
grid, to make sure tasks aren't huge. That process needs some tweaking, for
example apply a rule like "if resulting task < 100 m², merge it to the
adjacent task".

-- 
Joost Schouppe
OpenStreetMap  |
Twitter  | LinkedIn
 | Meetup

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