On 2 January 2014 15:57, Fernando Trebien <fernando.treb...@gmail.com>wrote:
> I like your idea of splitting surface values into paved and unpaved > tags quite a lot, Matthijs. It allows certain values (such as > compacted) to be considered paved or unpaved by different communities, > and it's easy to identify a contradiction (when both tags are > present). > I think we can build on this idea, but instead of introducing a paved=yes/no tag, which may cause confusion with the surface=paved tag, how about this: surface:sealed=yes/no the idea here would be to convey an additional information if the given type of surface can be considered sealed, that is water impermeable or not prone to change under weather different conditions. Then, we could select a small but *fixed* set values for surface such as paved,asphalt,concrete which would be implicitly equivalent to surface:sealed=yes. We would use the first six or so most used values for surface which would be surface:sealed=yes beyond doubt. So the rules could be something like this: 1) in the absence of surface:sealed, but with a surface=paved|asphalt|concrete (fixed set of values) => imply surface:sealed=yes, if that is OK, no retagging required 2) in the absence of surface:sealed, but with any other surface tag => imply surface:sealed=no, if that is OK, no retagging required 3) uncommon surface materials which would result in sealed surfaces would need to make it explicit, say surface=rubber would required surface:sealed=yes, I guess this would require minor retagging. I believe this would handle the majority of cases without retagging, it would also solve the case of surface=compacted where the mapper could use surface:sealed=yes if he/she considers this appropriate. For the renderers/routers they would basically deal with whatever falls into surface:sealed either by implicit rules applied to a small set of fixed values or by an explicit surface:sealed. Does that seem reasonable?
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