[HOT] [Tagging] Consolidating tags for building attributes

Vivien Deparday vivien.deparday at gmail.com
Mon Oct 7 20:39:20 UTC 2013


Thank you Tobias (sorry for the late answer), that is very useful feedback
and pretty much exactly in line with our thinking on all the cases which is
great. For B, we are actually also using plaster as one of the values as
the values are recorded by looking at the building 'from the streets'.
For C, I think we will use both building:use (for general usage categories)
and building= with specific values in the cases similar to what you
mentioned.
The Kathmandu Living Labs Team has added a description of all the tags and
values in the preset including for shape:elevation that you were asking
about:
http://wiki.openstreetmap.org/wiki/Nepal/kathmandulivinglabs/exposuresurveyIt
is a simple way of recording the vertical shape if you cannot record
all
the details of each building.

Best,

Vivien

On Fri, Aug 23, 2013 at 1:21 PM, Tobias Knerr <osm at tobias-knerr.de> wrote:

> Hello Vivien,
>
> I develop a 3D renderer working with OSM data, so I will look at your
> questions based on that background.
>
> Case A: roof:material vs. building:roof
>
> The preferred key from 3D rendering documentation is roof:material
> because, as you guessed, it clearly differentiates this attribute from
> roof:shape. Based on just the wording of the key, building:roof could be
> either - so you would have to look it up.
>
> Case B: building:walls vs. building:material
>
> I'm not sure what building:walls means exactly, I'm not using that tag
> for rendering so far. But I can clarify the intention with
> building:material: It's supposed to represent the outer material as seen
> while mapping on-the-ground. Therefore, "plaster" is a valid value for
> building:material because that's the outermost layer, even though the
> entire wall is not made from plaster. If building:walls has the same
> meaning, then I prefer building:material for the same reason as in Case A.
>
> Case C: building vs. building:use
>
> I have to agree with you here, the values used for the building key are
> quite chaotic. But from the original intention as I remember it, I do
> not think that the two things have the same meaning. For example, a
> commonly cited example is that a church building which is no longer used
> as a church and is now a museum (but still looks like a typical church)
> would be tagged building=church + amenity=museum.
>
> Personally, I only use a few hand-picked values from the building key
> that have a rather clear meaning.
>
> As for Case D and the other suggested keys, these are new or seem
> unrelated to 3D rendering. However, I'm not sure about the exact meaning
> of your suggested shape:elevation?
>
> Tobias
>
>
> On 23.08.2013 18:22, Vivien Deparday wrote:
> > Hi all,
> > The OpenDRI project has been doing some work in Nepal and Sri Lanka to
> > trace building footprints and to enter attribute data about the
> > buildings. We are looking to get feedback from the tagging and HOT
> > mailing list on the building presets that we are using and we would like
> > to consolidate them with the HDM preset [1] and with the rest of the
> > work done by HOT (e.g. in Indonesia [2]) to make sure it is consistent
> > to use it with InaSafe [3] or for 3D Modeling [4] or any other
> applications.
> >
> > The presets developed by OpenDRI so far are Nepal [5] and Sri Lanka [6].
> > The Nepal presets already received a couple comments from the tagging
> > list that were applied.
> >
> > 1. We have been using 3D building guidelines (although they have a few
> > contradictory elements), taginfo statistics and looked at a lot of
> > tagging guidelines on the OSM wiki to create the keys and values but we
> > didn't really find one general guideline for creating new tags so we
> > would welcome any feedback on the presets [5] and [6].
> >
> > 2. There are a couple discrepancies:
> >
> > Case A:
> > For the roof material, these keys have been used about the same number
> > of times:
> > In wiki gbothuidelines: roof:material=
> > or
> > In HDM or Indonesia: building:roof=
> > It seems like the first option would be better? because it allows to
> > differentiate with roof:shape ?
> >
> > Case B:
> > For wall material (different from building structure)
> > In Indonesia: building:walls=
> > or
> > In HDM presets: building:material=
> > building:material is more widely used or do the two tags are meant to be
> > different?
> >
> > Case C:
> > For building usage,
> > building=
> > building:use=
> > I am not sure what is the best between these two or do they have
> > different goal/usage? building= seem to be a mix of usage, amenity type,
> > structure type.
> >
> > Case D:
> > capacity:persons=
> > occupants=
> > I suppose they represents two different things: full capacity of a
> > building vs actual occupancy ?
> >
> >
> > Some other tags that could be added to the HDM:
> > building:structure
> > roof:shape
> > shape:plan
> > shape:elevation
> >
> > If there is some kind of agreement I can create a pull request on the
> > HDM presets and add some of the new tags we are using too. The detailed
> > information about the new tags used in the presets will also be added to
> > pages on the wiki.
> >
> > Cheers,
> >
> > Vivien
> >
> > [1] _
> http://wiki.openstreetmap.org/wiki/Humanitarian_OSM_Tags/HDM_preset#Building_digitizing_
> > [2] _https://github.com/hotosm/hot-indo/blob/master/bpbd_presets.xml_
> > [3] _http://inasafe.org/contents.html_
> > [4] _http://wiki.openstreetmap.org/wiki/Simple_3D_buildings_
> > [5] _http://visualtags.hotosm.org/collection/10_  (2 notes: the source
> > tag will be removed from the presets and put on the changesets,
> > building:start_date => start_date)
> > [6] _https://www.dropbox.com/s/50blzkwmvxmbbw6/sri_lanka_presets.xml_
> >
> >
> > _______________________________________________
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> > Tagging at openstreetmap.org
> > http://lists.openstreetmap.org/listinfo/tagging
> >
>
>
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