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I would like to map some foot paths that were observed that allow land access to wooded islands. These are only visible at low tide. What tag should I use to indicate their temporary availability? tidal=yes seems to be used only for water areas. |
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One possible way of doing this would be to use the conditional restriction scheme and invent (and document) values for low/high tide. |
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There is a reasonably well used tag of tidal=yes which can be applied to any element which is likely to be covered by water at some phase of the tides. This is the minimum required, and I think rather less elaborate than using conditional restrictions. The main issue at the moment is that I doubt if people consume this tag along with highways, it certainly has not been added on some of the obvious candidates. |
It occurred to me that there are some famous castles in Europe that are only accessible at low tide. I looked one up in OSM, and I see even these are not using special tags for tidal access. They put the information in the name (gasp!) http://www.openstreetmap.org/way/79577445
Your link and this one both put tide warnings in the name box which do warn many map browsers although this method is not liked by many. http://www.openstreetmap.org/#map=17/50.12027/-5.47646
Or indeed this one http://www.openstreetmap.org/way/177923987. In the absence of explicit rendering for tidal areas this is probably sensible.