[HOT] Houses or buildings with no roof in W Africa mapping

Sat Sep 13 14:54:45 UTC 2014

I am not sure that this construction tag helps us about the status of these houses. The imagery can be a few years old. Also from my experience in Haiti, people build rapidly the first floor and then start to mount walls for the second floor. But this can stay unchanged for years.

UAV Imagery project initated and managed by Fred Moine gives us a good perspective on this for Limonade, north of Haiti. If you look carefully at the houses under construction, you should see the first floor.

See http://wms.openstreetmap.fr/haiti?zoom=21&lat=19.67059&lon=-72.1243&layers=0B000000

The quality of the imagery we have if often not clear enough to establish the status of these houses.

Pierre 

________________________________
 De : Andrew Buck <andrew.r.buck at gmail.com>
À : Courtland Yockey <ceyockey at comcast.net> 
Cc : HOT Openstreetmap <hot at openstreetmap.org> 
Envoyé le : Samedi 13 septembre 2014 9h47
Objet : Re: [HOT] Houses or buildings with no roof in W Africa mapping

For these I use building=constructuion.  I think landuse=construction is for larger areas like a construction site where a large building or parking lot or something is being built.  Adding the date is not a bad idea but probably not essential; doesn't hurt to add it though.

-AndrewBuck

On Sat, Sep 13, 2014 at 6:23 AM, Courtland Yockey <ceyockey at comcast.net> wrote:

When I trace something like this, I use the key-value "landuse=construction".  I also am in the habit of annotating traced objects with imagery date on the object, which is more useful for something like this than, for instance, doing so for travelways. --Courtland
>
>
>________________________________
>
>From: "Nick Allen" <nick.allen.54 at gmail.com>
>To: "Blake Girardot" <bgirardot at gmail.com>, hot at openstreetmap.org
>Sent: Saturday, September 13, 2014 3:43:23 AM
>Subject: Re: [HOT] Houses or buildings with no roof in W Africa mapping
>
>
>
>
>Blake,
>
>They could be both. When I asked the question a few months ago
      concerning similar structures elsewhere in Africa I was told that
      it can take a while for something to be built & finished, but
      it can also be a case of something has become disused & the
      roof removed. In either case, it would be a relatively quick job
      for someone to clean it up and add a roof.
>
>Something to consider - since the satellite imagery was taken the
      structure could have changed - now be complete & with
      residents. In some areas corrugated iron is available & a roof
      could be added in a few hours. 
>
>The other option is something like a pig sty - a small building
      with a roof for the animal to shelter in with a compound or
      compounds attached to it - pigs, goats, etc..
>
>I can't see for sure what that particular image is showing  -
      probably the animal compound but it could just as easily be the
      residence in decay or slow construction.
>
>The outlines we are tracing today could be unchanged on the map
      for many months / years. I try to make sure they will appear in
      the data in one format or another because at least someone using
      just the map data can look at it and say "There's some kind of
      building there" & perhaps another say "That's John's farm,
      it's gone now but the road still goes through there" - you need
      the local knowledge that we just can't possess.
>
>Acceptable options to me all involve the structure being traced
      and appear in https://wiki.openstreetmap.org/wiki/Key:building . Whatever it is, it's construction includes barrier=wall which is also a valid option. I have no wish to offend someone who is probably a better mapper than me, so I try not to alter tags if they appear in the wiki, but I will probably do so if they don't render in Mapnik or Humanitarian style renderings.
>
>If it was me doing the tracing I would keep it simple;
>barrier=wall
>or
>building=yes
>
>Hope this helps
>
>Regards
>
>Nick
>(Tallguy)
>
>On 13/09/14 05:44, Blake Girardot wrote:
>
>Hi, 
>>
>>New user supersonic3974 asked this question in irc last night but
      didn't get a reply: 
>>
>>[22:45] <supersonic3974> Hey, quick question.  What are
      these things that look like buildings under construction?  They
      seem to be everywhere.  Here's an example:  http://imgur.com/ccS03xv 
>>
>>I have that same question coincidentally enough. 
>>
>>They look like buildings with no roof. 
>>
>>Are they buildings under construction or structures that lost
      their roof? 
>>
>>My guess is we wouldn't outline them since they probably are not
      inhabited, but I don't know for sure. 
>>
>>I'll make sure he gets an answer if someone replies here. 
>>
>>Cheers, 
>>Blake 
>>
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>
>
>-- 
>
>Nick
>Volunteer 'Tallguy' for https://wiki.openstreetmap.org/wiki/Humanitarian_OSM_Team
>http://www.openstreetmap.org/user/Tallguy
>Treasurer, website & Bonus Ball admin for http://www.6thswanleyscouts.org.uk/ (treasurer at 6thswanleyscouts.org.uk)
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