[Tagging] building=yes for multiple building

Mike Thompson miketho16 at gmail.com
Sat Mar 19 14:24:59 UTC 2016

Here is an example of what I feel should be discouraged:

(given that this is part of a HOT project, it is likely to be
corrected/improved soon)

In this case the individual buildings are clearly visible, and there is
non-building space between them.


On Thu, Mar 17, 2016 at 6:51 AM, Philip Barnes <phil at trigpoint.me.uk> wrote:

> 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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