@Dave F Here is an example of where idependent buildings have been built as connected in OSM (https://osm.org/go/zrViz5k4A--?layers=D&m=). Here is an area where we have a great difficulty tracing using satellite imagery alone and where mapping historically has not been clear regarding this rule ( http://osm.org/go/zrWcyA9Wb?m=).
On Wed, Oct 25, 2017 at 9:52 PM, Dave F <davefoxfa...@btinternet.com> wrote: > Could you link to an example? > > DaveF > > > On 25/10/2017 16:36, Gaurav Thapa wrote: > > "2. Buildings. > If 2 buildings share a wall or are constructed one aside the other (double > wall), you should have them connected in OSM as well." > > In Nepal we have been trying to make sure that each constructed building > has its own footprint and is not connected to a neighbouring structure via > a shared wall. We do this as in reality this is the case as each building > structure though built next to each other has its own footprint > (independent foundation). We have changed many buildings that have been > drawn as suggested by you Martin (previously traced by remote mappers > especially in highway towns of Nepal). > > So, there if there is a set of rules it would help us as well. > > Regards > > On Wed, Oct 25, 2017 at 4:48 PM, Martin Koppenhoefer < > dieterdre...@gmail.com> wrote: > >> 2017-10-25 11:50 GMT+02:00 Tomas Straupis <tomasstrau...@gmail.com>: >> >>> Hello >>> >>> For a long time I wanted to hear opinion on the topic of topology >>> rules. >>> >>> By "topology rules" here I mean just simple rules such as: >>> * polygon X should not overlap polygon Y >>> * polygon X should always be above polygon Y >>> * point X should be not further from line Y than D >>> etc. >>> >> >> >> >> most important is IMHO: when do you share nodes, and when not. >> >> >> 1. E.g. political boundaries usually should reuse the same border ways >> (=no gap between entities). >> >> Other examples: >> >> 2. Buildings. >> If 2 buildings share a wall or are constructed one aside the other >> (double wall), you should have them connected in OSM as well. >> >> If a square is delimited by buildings, the place=square object should >> share ways with the buildings. >> etc. >> >> Some mappers tend to map these things very close but distinct, which IMHO >> is a topology error. >> The rule I want to see: map in a way that it represents reality nicely. >> >> 3. Roads and areas: >> Some mappers connect "incompatible" object types (centre lines of roads >> and areas). The areas should end at their border and not be extended. >> >> Cheers, >> Martin >> >> _______________________________________________ >> talk mailing list >> talk@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/talk >> >> > > > -- > Gaurav Thapa > Project Manager > Secondary Cities Pokhara Project > Kathmandu Living Labs > > > _______________________________________________ > talk mailing > listtalk@openstreetmap.orghttps://lists.openstreetmap.org/listinfo/talk > > > > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> > Virus-free. > www.avast.com > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> > <#m_-5115046008826388596_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > > _______________________________________________ > talk mailing list > talk@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk > > -- Gaurav Thapa Project Manager Secondary Cities Pokhara Project Kathmandu Living Labs
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