[Tagging] building=yes for multiple building

Philip Barnes phil at trigpoint.me.uk
Thu Mar 17 12:51:28 UTC 2016

On Thu, 2016-03-17 at 10:37 +0100, Martin Koppenhoefer wrote:
> 2016-03-17 10:24 GMT+01:00 Ralph Aytoun <ralph.aytoun at ntlworld.com>:
> >  
> > At the moment I see mappers leaving blank spaces because they
> > cannot identify individual buildings, either because of the
> > complexity of the area or because the imagery is not sharp enough.
> > This approach will allow them to indicate that there are structures
> > there but need more attention.
> > 
> IMHO if you can't identify individual buildings because you are
> working from remote and don't know the area and the aerial imagery is
> not sharp enough, you simply shouldn't map individual buildings and
> refrain from using the building tag. Use the landuse tag, map the
> areas and wait for better imagery, or use alternative methods if you
> are on the ground and know how to do it.
It is not that simple and certainly not about aerial imagery quality,
we are not all mapping planned North American cities where everything
is a perfect right angle.
In the real world we are mapping towns with medieval building patterns
that evolved over millennia and even modern buildings that replace
older buildings must still fit within this plan.
Whilst you can see roof lines, the buildings can fill the entire block
and from above it is not possible to work out what frontage building
each roofline belongs to. To say that in this case just map as landuse
is totally wrong. A single building is a start, or more likely several
single buildings. It is far easier to then survey the area on the
ground having something to improve than working with a blank landuse.
For example you may visit a shop and as you wander through there will
be nooks and crannys, it may open out into a another building and armed
with the roughly mapped buildings you can work out where you are and
that belongs to that building and improve the mapping.
Phil (trigpoint)
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