[Talk-us] Timezones in USA?

[Luis Villa]

And a timely (no pun intended) reminder that state lines can be fluid too:
https://www.washingtonpost.com/national/altered-state-border-redraw-leaves-16-in-different-carolina/2016/05/29/9b2d1908-25ae-11e6-8329-6104954928d2_story.html

On Mon, May 30, 2016, 9:57 AM John F. Eldredge <john at jfeldredge.com> wrote:

> 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> <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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