Michael Patrick <geodes...@gmail.com> writes: > You'd probably be okay using the 10 lux indicated by the Illuminating > Engineering Society. But considering that the illuminate area is uneven ( a > notion also covered in the standard ) and usually fairly extensive, and > illumination measurement is a technical skill, and it is a moving target > because of the daily cycle and weather, it probably isn't practical o > expect some member of the general public to collect the data.
Agreed that most mappers cannot measure this, and that all mappers cannot measure it easily. About IES and 10 lux: in my town that is considered very high, and in parking lots beyond what is allowed. A parking lot that ranges from 0.5 to 3 lux is considered lit. Average illuminances tend to be 3-4ish, if built according to our light polllution bylaw. (I realize that typical city notions of what is appropriate are different.) So, saying that something under 10 lux is "lit=no" would not be ok. I tend to leave the definition alone and not worry that people are making judgements in marginal cases. If there are fixtures installed to light something, and they are doing what was more or less intended, then it's lit=yes, even if the level is lower than somebody else might like. To me, marginal cases include: there were lights installed but they are now not working well (but somewhat). This is rare enough not to worry about. on a walkway in the city, where there are no fixtures intended to light the walkway, but due to ambient light from many nearby sources, there is a level of 1 lux or more This second case could arguably be lit=no but it's also dark=no. I like the suggestion of needing to use a flashlight. I don't think we should get too hung up on the edges of subjective. A notion might be Do more than 50% of the users of the path either use a flashlight or wish they had one to use. which is of course fuzzy, but people making that judgement in good faith are unlikely to have serious arguments. For cases right on the edge, it doesn't really matter how they are tagged. Beyond this, recording illuminance levels makes sense, even though that's another can of worms. _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
