[tz] tz dependency lat & lng

[Lester Caine]

Guy Harris wrote:
> In order to use OSM to construct boundaries for tzdb zones, a*mixture*  of administrative boundaries would be required, so that*wouldn't*  constitute replacing tzdb boundaries with administrative boundaries from the OSM database, it would constitute*constructing*  higher-quality tzdb boundaries from the administrative boundaries.

The reason that an adminastrative boundary for timezone is not yet available is 
because nobody has had time to create it. It will use elements of existing 
relations, but to be honest the current thinking is that simply tagging elements 
that have a unique timezone with that information. That way when one looks up a 
place record you get the information without having to do a geometric search.

http://taginfo.openstreetmap.org/keys/?key=timezone#values

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Lester Caine - G8HFL
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