On Thu, 24 Jan 2019 at 18:04, Viking <vikin...@tin.it> wrote: > Hello, > as pointed out here [1], we need to clarify the meaning of > fire_hydrant:diameter=*. > [...]
> Which diameter is instead reported on the signboard in other countries? In the UK, the yellow "H" sign indicates two numbers. Upper number is the diameter of the water main in millimetres, lower number distance to the hydrant in metres. Older signage used inches and feet, respectively (no ambiguity because if you see a diameter of 6 it's inches and if you see 150 it's mm). See http://metricviews.org.uk/2012/05/fire-hydrant-signs-a-successful-metric-conversion/ Note that the diameter on the sign is of the water main, *not* the hydrant coupling. That is standardized at 64mm (2.5 inch) across the UK. The standarization became a legal requirement many years ago after a fire crew from another area turned up and couldn't connect to the hydrant. See https://www.fireprotectiononline.co.uk/info/stand-pipe-standard-size/ For what a few other countries do, you can get info about some of them from https://en.wikipedia.org/wiki/Fire_hydrant After that, you'll have to google around, like I just did for the UK And should we put this data in fire_hydrant:diameter? > > [1] > https://wiki.openstreetmap.org/wiki/Talk:Tag:emergency%3Dfire_hydrant#Clarification_of_diameter > Your guess is as good as mine. You'll have to see what other countries do before you can figure out which of water main diameter and coupling diameter are useful. Looking at the page, there's already a tag for coupling diameter, so it looks like fire_hydrant:diameter must originally have been intended for the diameter of the water main. Water main diameter is marked on signage in the UK and Australia but not in the US, where a colour code indicates the water pressure. I think you have some work ahead of you to come up with tagging that covers everything, and even more work to document it clearly. -- Paul
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