[OSM-talk] Specialist mapping

[Lester Caine]

Another list where I am making myself unpopular is the tz database one. Reasons 
for that inly matter if you display time before 1970, but that is another matter.

In the OSM data we have what looks like a complete coverage of the current 
timezone map, and many of the large areas are tagged at the country or state 
level, but some zones are passing through the middle of the larger relation, so 
are tagged on smaller one.

The question that has been asked is 'how do I find the objects covering a 
particular timezone?' I suspect that overpass can produce this, but given the 
size of the areas I'm not sure it's appropriate? It's just stuck 'processing 
query' at the moment ... and timeout :(

What I think I need to do is create a slippy map which has the timezones as an 
overlay and can return a timezone for a coordinate entry. I can pull up the time 
information for the timezone via my other tools. So can anybody suggest what may 
be the best way to for something which needs to able to handle full world as 
easily as fine detail?

-- 
Lester Caine - G8HFL
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