Re: [Tagging] RFC - Feature Proposal - area of steps for pedestrians. -constant width stairs
On 30/03/19 10:43, Christoph Hormann wrote: On Saturday 30 March 2019, Warin wrote: However where the stair width is large, say 100s of meters, picking the centre becomes harder. That's an editor UI problem, not a data model problem. Most renders pay no attention to the width so the rendering is poor. That's because almost all rendering software lacks native support for ground unit operations so this is relatively complicated to implement. But designing data models to work around limitations of current software, in other words: Suggesting mappers to invest thousands of hours of work to spare software developers the need to learn what a projection scale factor is, that is not an approach i would recommend. Ok. But for edge cases of non rectangular, non even steps .. this approach could be a solution? But i am getting carried away... Feel free! Just 'measured' the Sydney Opera House steps - 85 m wide. Certainly seems wider when you walk them, and narrower when it is full of people sitting/standing to watch something. ___ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] RFC - Feature Proposal - area of steps for pedestrians. -constant width stairs
On Saturday 30 March 2019, Warin wrote: > > However where the stair width is large, say 100s of meters, picking > the centre becomes harder. That's an editor UI problem, not a data model problem. > Most renders pay no attention to the width > so the rendering is poor. That's because almost all rendering software lacks native support for ground unit operations so this is relatively complicated to implement. But designing data models to work around limitations of current software, in other words: Suggesting mappers to invest thousands of hours of work to spare software developers the need to learn what a projection scale factor is, that is not an approach i would recommend. But i am getting carried away... -- Christoph Hormann http://www.imagico.de/ ___ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
Re: [Tagging] RFC - Feature Proposal - area of steps for pedestrians. -constant width stairs
On 29/03/19 22:41, Christoph Hormann wrote: You should keep in mind that >90 percent of stairs that exist are simple constant width + strait step stairs that can perfectly accurately be mapped with a linear highway=steps and a width tag. If you approach the problem with how to extend this method in ways that are (a) optional and backwards compatible, (b) make use of the information already present in the linear way mapping and (c) that cover most of the other <10 percent of the cases without the idea that the solution *has to be in the form of a polygon variant* that would more likely yield an efficient solution. Where the stair width is narrow it is easy to pick the centre for a simple way and tag it for the width. However where the stair width is large, say 100s of meters, picking the centre becomes harder. Most renders pay no attention to the width so the rendering is poor. Routers too will think that the distance is greater than reality. By placing laterals at each side these issues might be minimised. ___ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
