US Department of Transportation map of US timezones
I just found out through https://x.com/RedistrictNet/status/1863742503242875046 That the US Department of Transportation has just rolled out an official map of US timezones. It's supposed to be at: https://geodata.bts.gov/datasets/usdot::time-zones/about (It doesn't load for me at the moment, possibly due to high demand.) Roozbeh
Roozbeh Pournader via tz said:
I just found out through [1]https://x.com/RedistrictNet/status/1863742503242875046 That the US Department of Transportation has just rolled out an official map of US timezones. It's supposed to be at: [2]https://geodata.bts.gov/datasets/usdot::time-zones/about (It doesn't load for me at the moment, possibly due to high demand.) Roozbeh
Would anyone be able to explain what's going on at https://geodata.bts.gov/datasets/usdot::time-zones/explore?location=47.03463... ? -- Clive D.W. Feather | If you lie to the compiler, Email: clive@davros.org | it will get its revenge. Web: http://www.davros.org | - Henry Spencer Mobile: +44 7973 377646
Analog clock second hand? @dashdashado :-) On Thu, Dec 5, 2024 at 3:05 PM Clive D.W. Feather via tz <tz@iana.org> wrote:
Roozbeh Pournader via tz said:
I just found out through [1]https://x.com/RedistrictNet/status/1863742503242875046 That the US Department of Transportation has just rolled out an official map of US timezones. It's supposed to be at: [2]https://geodata.bts.gov/datasets/usdot::time-zones/about (It doesn't load for me at the moment, possibly due to high demand.) Roozbeh
Would anyone be able to explain what's going on at
https://geodata.bts.gov/datasets/usdot::time-zones/explore?location=47.03463... ?
-- Clive D.W. Feather | If you lie to the compiler, Email: clive@davros.org | it will get its revenge. Web: http://www.davros.org | - Henry Spencer Mobile: +44 7973 377646
On Thu, 5 Dec 2024, Clive D.W. Feather via tz wrote:
Roozbeh Pournader via tz said:
I just found out through [1]https://x.com/RedistrictNet/status/1863742503242875046 That the US Department of Transportation has just rolled out an official map of US timezones. It's supposed to be at: [2]https://geodata.bts.gov/datasets/usdot::time-zones/about (It doesn't load for me at the moment, possibly due to high demand.) Roozbeh
Would anyone be able to explain what's going on at https://geodata.bts.gov/datasets/usdot::time-zones/explore?location=47.03463...
that weird bit of line is, on the left hand side, a straight line between the michican/wisconsin land border (south) and michigan wisconsin state border on the canadian border (north) - following the outline of the state the right hand side of the line goes back north into the lake up to the county boundary of Gogebic county, Michican (which is in central timezone unlike most of michigan) and then follows the in-lake county outline eastwards - following the outline of the county. See the map here: https://en.wikipedia.org/wiki/Gogebic_County,_Michigan#/media/File:Gogebic_C... so maybe its bad composition of state and county outlines in some way --
The time zone regulation describes the line this way: "From the junction of the western boundary of the State of Michigan with the boundary between the United States and Canada northerly and easterly along the west line of Gogebic County to the west line of Ontonagon County; thence south along the west line of Ontonagon County to the north line of Gogebic County;" https://www.ecfr.gov/current/title-49/subtitle-A/part-71/section-71.5 But this description doesn't seem possible, because Gogebic County doesn't border Canada: https://www2.census.gov/geo/maps/DC2020/GARM20/GARM2020_ST26_MI.pdf It seems that the zigzag line on the map was their attempt to follow the description anyway.
Since the Lake Superior isn't an ocean, technically there is a border out in the water between Michigan and Canada. On Fri, Dec 6, 2024 at 6:31 AM Heitor David Pinto via tz <tz@iana.org> wrote:
The time zone regulation describes the line this way: "From the junction of the western boundary of the State of Michigan with the boundary between the United States and Canada northerly and easterly along the west line of Gogebic County to the west line of Ontonagon County; thence south along the west line of Ontonagon County to the north line of Gogebic County;" https://www.ecfr.gov/current/title-49/subtitle-A/part-71/section-71.5
But this description doesn't seem possible, because Gogebic County doesn't border Canada: https://www2.census.gov/geo/maps/DC2020/GARM20/GARM2020_ST26_MI.pdf
It seems that the zigzag line on the map was their attempt to follow the description anyway.
Yep. The only Great Lake that doesn’t have a border with Canada is Michigan. On Fri, Dec 6, 2024, at 12:37 PM, D Nathan Cookson via tz wrote:
Since the Lake Superior isn't an ocean, technically there is a border out in the water between Michigan and Canada.
On Fri, Dec 6, 2024 at 6:31 AM Heitor David Pinto via tz <tz@iana.org> wrote:
The time zone regulation describes the line this way: "From the junction of the western boundary of the State of Michigan with the boundary between the United States and Canada northerly and easterly along the west line of Gogebic County to the west line of Ontonagon County; thence south along the west line of Ontonagon County to the north line of Gogebic County;" https://www.ecfr.gov/current/title-49/subtitle-A/part-71/section-71.5
But this description doesn't seem possible, because Gogebic County doesn't border Canada: https://www2.census.gov/geo/maps/DC2020/GARM20/GARM2020_ST26_MI.pdf
It seems that the zigzag line on the map was their attempt to follow the description anyway.
-- Kenneth Murchison Senior Software Developer Fastmail US LLC murch@fastmailteam.com
A swim lane for Yupper's ?? -----Original Message----- From: Clive D.W. Feather via tz <tz@iana.org> Sent: Thursday, December 5, 2024 2:04 PM To: Roozbeh Pournader <roozbeh@unicode.org> Cc: Time zone mailing list <tz@iana.org> Subject: [tz] Re: US Department of Transportation map of US timezones Alert: This is an external email. Roozbeh Pournader via tz said:
I just found out through [1]https://urldefense.com/v3/__https://x.com/RedistrictNet/status/1863742503242... That the US Department of Transportation has just rolled out an official map of US timezones. It's supposed to be at: [2]https://urldefense.com/v3/__https://geodata.bts.gov/datasets/usdot::time-zon... (It doesn't load for me at the moment, possibly due to high demand.) Roozbeh
Would anyone be able to explain what's going on at https://urldefense.com/v3/__https://geodata.bts.gov/datasets/usdot::time-zon... ? -- Clive D.W. Feather | If you lie to the compiler, Email: clive@davros.org | it will get its revenge. Web: https://urldefense.com/v3/__http://www.davros.org__;!!LkoGuYl8_g!3dQ6PiL0jpL... | - Henry Spencer Mobile: +44 7973 377646
May be best to be specific about the nature of the USDOT map (since it does not cover variations such as those within Arizona). @dashdashado *** old/tz-link.html 2024-12-06 06:58:09.081304900 -0500 --- new/tz-link.html 2024-12-06 06:59:54.100688400 -0500 *************** *** 937,943 **** href="https://www.transportation.gov/regulations/recent-time-zone-proceedings">Recent Time Zone Proceedings</a> lists changes to time zone boundaries, and its <a href="https://geodata.bts.gov/datasets/usdot::time-zones/about">Time ! Zones dataset</a> lists current boundaries.</dd> <dt>Uruguay</dt> <dd>The Oceanography, Hydrography, and Meteorology Service of the Uruguayan Navy (SOHMA) publishes an annual <a --- 937,943 ---- href="https://www.transportation.gov/regulations/recent-time-zone-proceedings">Recent Time Zone Proceedings</a> lists changes to time zone boundaries, and its <a href="https://geodata.bts.gov/datasets/usdot::time-zones/about">Time ! Zones dataset</a> shows "the official written time zone boundaries from USDOT’s Office of General Counsel per 49 CFR Part 71."</dd> <dt>Uruguay</dt> <dd>The Oceanography, Hydrography, and Meteorology Service of the Uruguayan Navy (SOHMA) publishes an annual <a On Fri, Dec 6, 2024 at 1:40 AM Paul Eggert via tz <tz@iana.org> wrote:
Thanks for the heads-up; I installed the attached proposed patch.
On Dec 6, 2024, at 4:05 AM, Arthur Olson via tz <tz@iana.org> wrote:
May be best to be specific about the nature of the USDOT map (since it does not cover variations such as those within Arizona).
I.e., it covers time zones: https://en.wikipedia.org/wiki/Time_zone rather than what we call "timezones", no space: https://data.iana.org/time-zones/theory.html
On Fri, 6 Dec 2024 at 14:46, Guy Harris via tz <tz@iana.org> wrote:
On Dec 6, 2024, at 4:05 AM, Arthur Olson via tz <tz@iana.org> wrote:
May be best to be specific about the nature of the USDOT map (since it does not cover variations such as those within Arizona).
I.e., it covers time zones:
https://en.wikipedia.org/wiki/Time_zone
rather than what we call "timezones", no space:
That's a somewhat different, subtler distinction where the latter includes divergence in historical timekeeping practice, whereas the former is more broadly rooted in present-day practice. It's perhaps a bit more accurate to simply say that such variations are not reflected on the USDOT map because those variations are not a part of US federal law. -- Tim Parenti
On 2024-12-06 04:05, Arthur Olson wrote:
May be best to be specific about the nature of the USDOT map (since it does not cover variations such as those within Arizona).
Thanks, good idea. I installed the attached. It's not quite the same as the wording you proposed, as it doesn't quote the USDOT legalese word-for-word (which I hope is unnecessary in this brief summary), whereas it mentions the Arizona situation explicitly (as the reader may not be aware of it). I resisted the temptation to mention the odd Lake Superior zigzag, which is probably not important enough to appear in tz-link.html.
participants (11)
-
Arthur Olson -
benc＠hawaga.org.uk -
Clive D.W. Feather -
D Nathan Cookson -
Guy Harris -
Heitor David Pinto -
Ken Murchison -
Paul Eggert -
Roozbeh Pournader -
Stolte, Jonathan -
Tim Parenti