> Just because mapping something requires real survey rather than mapping from aerial imagery is not making it fictional or unofficial.
You are correct. To clarify, my use of quotation marks is meant to communicate that I'm not literally saying they are a fiction - just similar to one. There is no official, exact linear-ish feature you can trace to know where an unmarked crossing is. Often, pedestrians can legally cross at any point across a particular street - but of course, we're not drawing 200 footway=crossing, crossing=unmarked lines down a single street to make sure we've covered enough options. Mappers (myself included) are doing their best to simulate where a pedestrian can cross, usually near a street intersection, and typically in an attempt to connect sidewalks together, without any dedicated visual indication. > Typical footway is also linear. In theory, but often not in actuality. It's easy to make car traffic into lines, with lanes, where cars move along the path. If they don't, it tends to be illegal and dangerous! In contrast, pedestrians can walk from the bank to a bus stop, moving in a completely orthogonal direction to the "footway" representing the sidewalk: they navigate a 2D space. We are simply providing abstractions for, e.g., the sidewalk or other footways to serve a subset of data needs: "how can I get from here to there using sidewalks?", where "here" and "there" are somewhat distant. > Unmarked crossings may also have legal implications (for example in Poland). Indeed, and this is also true of my area (Seattle, WA, USA). On Wed, May 8, 2019 at 2:37 AM Mateusz Konieczny <matkoni...@tutanota.com> wrote: > 8 May 2019, 01:30 by nbol...@gmail.com: > > - Unmarked crossings are abstract "fictions" representing where an > individual might cross the street, marked crossings are identifiable from > imagery. > - Because unmarked crossings are "fictions", they are only suggested > places to cross, according to the mapper. In contrast, marked crossings are > "official". > > Just because mapping something requires real survey rather than mapping > from aerial imagery is > not making it fictional or unofficial. > > - Marked crossings are one of the few pedestrian spaces that can be > straightforwardly considered as a linear feature: it connects spaces across > a street. > > Typical footway is also linear. > > - Marked crossings tend to have legal implications, as you note. > > Unmarked crossings may also have legal implications (for example in > Poland). > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging >
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