OpenStreetMap
In my area there has been a number of 'tidal areas' tagged by a user who has been doing an excellent job of mapping the ports and water features.
Unfortunately we have opposing views (we've had a few private conversations) on how these areas should be tagged. At present (the mapper's own tagging) they are tagged as "natural=mud" so they render clearly on the map as brown areas.
Personally I would prefer the scheme documented on the wiki [1] of "natural=wetland + wetland=tidalflat + tidal=yes".
The main problem with this is that the area renders as a marsh. The other mapper would prefer a more useful rendering, that on the main OSM map would enable users to see the difference between actual marsh and tidal areas. There is a bug filed with the OSM mapnik rendering [2], but I can't see anything changing soon.
I on the other hand would prefer the 'correct' wiki tagging per "don't deliberately tag incorrectly for the renderer" [3].
Anyone got any thoughts?
[1] http://wiki.openstreetmap.org/wiki/Tag:natural=wetland
[2] http://trac.openstreetmap.org/ticket/1607
[3] http://wiki.openstreetmap.org/wiki/Tagging_for_the_renderer