[OSM-talk] Underground / hovering buildings

andrzej zaborowski balrogg at gmail.com
Mon Feb 14 22:01:27 GMT 2011


Hi,

On 14 February 2011 22:37, Robin Paulson <robin.paulson en gmail.com> wrote:
> On 15 February 2011 10:26, Andrew Guertin <andrew.guertin en uvm.edu> wrote:
>> I have a few buildings that are not simply at ground level, and I can't
>> find how to map them on the wiki.
>>
>> First off, a skywalk between two buildings. Nothing fancy, although it
>> does go over a road.
>
> building=yes
> bridge=yes
> layer=1
>
>> Second, an underground building. Connects to other buildings that are at
>> ground level and have basements.
>>
>> Third, a building with a courtyard, and a basement that also extends
>> below the basement.
>>
>> Fourth a building that has been built into a cliff. At the top of the
>> cliff, on top of the building, are roads and sidewalks and things.
>>
>> Fifth, a building on a hill, with entrances variously on the third,
>> second, and first floor. One of the second floor entrances leads out
>> onto a "green roof", which has grass planted on it and connects to the
>> ground, but reaches out farther than the hill would naturally.
>>
>> Are there accepted ways to enter any of these buildings? If there's not
>> an accepted way, any thoughts on what I should do?
>
> the others are somewhat difficult - osm doesn't currently account for
> them very well. as with most maps, it is based on the assumption that
> 'ground' is consistent, and everything is a flat, thin item on top of
> it. until we think in a different paradigm, the instances you have
> listed will be difficult and only achievable by tags which are rather
> hacky in their nature (bridge, layer, level, etc.)

There's a proposal at
http://wiki.openstreetmap.org/wiki/User:Jongleur/MultiLevel_Building_Shapes
that works for some of these examples but for other uses would indeed
be hacky.  This proposed schema gained some popularity because there
are 3d renderers that understand it.

Cheers



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