[Talk-us] Timezones in USA?

[John F. Eldredge]

Note that "usually state lines" isn't the same thing as "always state 
lines".  The Central Time Zone/Eastern Time Zone boundary runs through 
the middle of both Tennessee and Kentucky, and the lines aren't 
straight.  They zig-zag according to which time zone the local 
politicians wanted.

On 05/27/2016 07:49 AM, Greg Troxel wrote:
> Frederik Ramm <frederik at remote.org> writes:
>
>> I have deleted a couple of such time zone polygons account of not being
>> verifiable on the ground.
>>
>> I don't know how time zones are defined "at the source" but it is very
>> unlikely that someone puts up signs. I guess there'll be some kind of
>> definition that can be kept *outside* of OSM, and can be translated to
>> polygons with the help of OSM if desired.
> This strict on-the-ground notion is overblown.  The real issue in
> verifiability is if an ordinary mapper can check the data.  Everyone
> around me knows that timezone they are in.  I'm sure everyone near a
> boundary knows where it is.  The rules are easily accessible in
> libraries, and they refer to boundaries that are signed (in the US,
> usually state lines).  You can look at clocks displayed in public.
>
> The real issue is where to draw the line about specialized details that
> don't belong on map.  In the case of time zones, they are something that
> has traditionally been represented on maps for a long time, in a base
> map kind of way, vs a thematic data shown on a base map kind of way.
>
>
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