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

Andrew Buck andrew.r.buck at gmail.com
Sat Sep 13 13:47:11 UTC 2014


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
>
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