On Wed, Jun 22, 2011 at 4:14 PM, M∡rtin Koppenhoefer <dieterdre...@gmail.com > wrote:
> what about introducing a kerb:height ? Implying heights from values > like "yes", "raised", "normal" will probably not be very reliable or > stable as this might vary from country to country and also in > different cities/neighbourhoods. > That could be an option, though there is more to a kerb than just it's height, but also it's design. To really capture the detail you'd need the height of the start of the (sloped) kerb above the roadway, the final height (at the sidewalk), and the run. From this you can get the slope, (rise over run). I think the wheelchair routing project tried/tries to capture this sort of detail, but it's far too detailed for most mappers. So even if you tag the height with kerb:height=15 cm, this doesn't tell you whether it's wheelchair accessible or not. If it's a hard edge (right angle) then it's definitely not, but if it's sloped over a distance then it may be accessible. Point is you can't tell from height alone, but need to at least know about the design of the kerb. I think it's better to focus on functional characteristics, i.e. wheelchair/bicycle accessible or suitable for buses or a warning to the blind (flush kerbs). -Josh
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