[tz] Reason for removal of several TZ abbreviations

Michael Douglass mikeadouglass at gmail.com
Wed Dec 6 20:35:02 UTC 2017

See https://tools.ietf.org/html/draft-murchison-tzdist-geolocate-01

On 12/6/17 13:09, Brian Inglis wrote:
> On 2017-12-06 10:58, Guy Harris wrote:
>> On Dec 6, 2017, at 8:50 AM, Brian Inglis <Brian.Inglis at systematicsw.ab.ca> wrote:
>>> On 2017-12-05 14:29, Guy Harris wrote:
>>>> So, for doing a script to do the equivalent of what macOS and iOS do, you'd
>>>> want more like "get your external IP address, geolocate it, and hand it to a
>>>> program with a set of shapefiles for tzdb regions". See, for example
>>>> 	https://github.com/evansiroky/timezone-boundary-builder
>>>> (to which
>>>> 	http://efele.net/maps/tz/world/
>>>> now refers people).
>>> More likely query the underlying geodatabase for the time zone region, often
>>> indexed by the minimum bounding rectangle [min x, min y[ - [max x, max y]
>>> surrounding the possibly non-convex hull, then resolve muiltiple hits by
>>> checking the interior convex polygons contain the coordinate, or equivalent tests.
>> That's what I meant by "hand it to a program with a set of shapefiles for tzdb regions".
> Sorry, to me a shapefile is an external data format used for interchange between
> GIS GUI products, distinct from the geodata used for its generation.

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