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 <[email protected] <mailto:[email protected]>> 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 <[email protected] <mailto:[email protected]>>: 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 <[email protected] <mailto:[email protected]>> wrote: Hi Pete & all, On Tue, Mar 8, 2016 at 12:00 PM, Pete Masters <[email protected] <mailto:[email protected]>> 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 -- Nicaragua main mobile/WhatsApp/Telegram: +505-8131-0729 <tel:%2B505-8131-0729>, Alt. mobile 8845-3391 Global (Google) Voice / SMS: +1-202-730-9778 <tel:%2B1-202-730-9778> * Skype: jhelleranta Twitter/Telegram/IRC/Mumble: @jaakkoh * My profile: http://jaakko.helleranta.com -- *Pete Masters* Missing Maps Project Coordinator +44 7921 781 518 <tel:%2B44%207921%20781%20518> missingmaps.org <http://www.missingmaps.org/> _@pedrito1414_ <https://twitter.com/TheMissingMaps> _@theMissingMaps_ <https://twitter.com/TheMissingMaps> _facebook.com/MissingMapsProject_ <https://www.facebook.com/MissingMapsProject> _______________________________________________ HOT mailing list [email protected] <mailto:[email protected]> https://lists.openstreetmap.org/listinfo/hot -- Joost @ Openstreetmap <http://www.openstreetmap.org/user/joost%20schouppe/> | Twitter <https://twitter.com/joostjakob> | LinkedIn <https://www.linkedin.com/pub/joost-schouppe/48/939/603> | Meetup <http://www.meetup.com/OpenStreetMap-Belgium/members/97979802/> | Reddit <https://www.reddit.com/u/joostjakob> | Wordpress <https://joostschouppe.wordpress.com/> -- *Pete Masters* Missing Maps Project Coordinator +44 7921 781 518 missingmaps.org <http://www.missingmaps.org/> _@pedrito1414_ <https://twitter.com/TheMissingMaps> _@theMissingMaps_ <https://twitter.com/TheMissingMaps> _facebook.com/MissingMapsProject_ <https://www.facebook.com/MissingMapsProject> _______________________________________________ HOT mailing list [email protected] https://lists.openstreetmap.org/listinfo/hot
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