[HOT] New mapping projects that could use some experienced mappers
Blake Girardot
bgirardot at gmail.com
Wed Mar 16 12:41:53 UTC 2016
Hi all,
I think it is difficult to get a more specific tag than building=yes for
most buildings from aerial imagery.
building=yes is generally correct because it is the most generic of
building tags that can be refined when more information is available.
It is not misusage to apply building=yes to multiple unit buildings that
share walls that is later refined to reflect the individual building
outlines, although we should always make an effort to make the most
accurate individual building outlines reasonably possible. Buildings
that are extended over time, added on to, etc, are not necessarily
multiple buildings, but often just become complicated single buildings.
Even some of the seemingly simple choices, apartments, condominiums,
mixed use, office building, terraces, etc we can not really be sure of
based on a picture of the roof only.
I think we risk making things more complicated and less accurate if we
as imagery based mappers start trying to apply more specific building
type tags without more detailed knowledge of the building in question.
Cheers,
Blake
On 3/16/2016 12:56 PM, Pete Masters wrote:
> building=multiple certainly describes it better. Terraces, in my mind,
> are generally linear in form, whereas some of these collections of
> buildings extend in all sorts of directions. Advice from the tagging
> list would be really useful, I think....
>
> Thanks Joost,
>
> Pete
>
> On Wed, Mar 16, 2016 at 11:30 AM, joost schouppe
> <joost.schouppe at gmail.com <mailto:joost.schouppe at gmail.com>> wrote:
>
> In Belgium (and probably most other European countries), cities are
> a hodgepodge of buildings and extensions built over time. It would
> change the meaning of building=terrace to use this in cases like
> this. (even the government can't keep track of this, often buildings
> are simply split along the cadastral borders)
>
> It would remove the implied meaning of building=yes to mean just one
> building, to tag this as just one building. However, the wiki page
> for building=yes doesn't even state this is the case. So between the
> two options I would pick this one.
>
> A more thorough solution might be a tag like building=multiple (used
> 22 times...) or a messy solution might be building=yes +
> fixme="remap individual buildings"
>
> If you like, I can post on the tagging list and report back here.
>
> 2016-03-16 11:45 GMT+01:00 Pete Masters <pedrito1414 at googlemail.com
> <mailto:pedrito1414 at googlemail.com>>:
>
> Hi Jaako,
>
> It's an interesting point. Being from the uk, I associate
> terraces with something very different from what is being mapped
> in Damascus.... But, building=yes is misleading in this case and
> terrace is a much more logical description.
>
> Be interested to hear what others think....
>
> Pete
>
> On Tue, Mar 15, 2016 at 3:16 PM, Jaakko Helleranta
> <jaakko at helleranta.com <mailto:jaakko at helleranta.com>> wrote:
>
> Hi Pete & all,
>
> On Tue, Mar 8, 2016 at 12:00 PM, Pete Masters
> <pedrito1414 at googlemail.com
> <mailto:pedrito1414 at googlemail.com>> wrote:
>
> some of the buildings are too difficult distinguish
> individually. However, I can see that there is a whole
> block of buildins. Is it ok to trace and tag the whole
> block as building=yes?
>
>
> This is a recurring issue/challenge in many densely built
> areas. I've come to think that in many cases they are often
> essentially local "row-houses" as I've gotten to know them
> in Finland or townhouses as Americans would call individual
> buildings that are attached to each other by their side
> walls but have their own entrances -- and can even be
> totally independently built over time, even decades. And for
> row-houses/townhouses there is an existing tag:
> building=terrace , see
> http://wiki.openstreetmap.org/wiki/Tag:building%3Dterrace .
>
> I don't remember that it would have been discussed in the
> context of HOT's mapping projects if this would be a
> suitable tag. But I think that especially when the buildings
> in question are attached by their side walls it's really
> quite clear that they are, indeed, "terrace" houses. Of
> course it's not often possible to be sure from imagery if
> the buildings are actually attached by their side walls or
> if they e.g. have (narrow) passages/paths between them,
> possibly under roofs. But at least building=terrace implies
> that it's (likely) not a single large building.
> As it can be seen from Taginfo the tag is also used already
> globally covering not only Europe and North America / other
> more developed areas but also other parts of the world too.
>
> This said, perhaps the "terrace" house tag should be
> included as a common building tag in applicable HOT mapping
> projects?
>
> Cheers,
> -Jaakko
>
>
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