search

evansiroky / timezone-boundary-builder

A tool to extract data from Open Street Map (OSM) to build the boundaries of the world's timezones.
MIT License
860 stars 82 forks source link

Odd timezone boundaries in Antarctica #104

Closed jannikmi closed 3 years ago

jannikmi commented 3 years ago

A user pointed out to me that the timezone boundaries in Antarctica seem to be off (Issue). Can you comment on this behavior? Here is a GUI view the issue: https://timezonefinder.michelfe.it/gui/0_133.24218750000003_-72.39570570653261

kohenkatz commented 3 years ago

timezones.json says:

  "Antarctica/DumontDUrville": [
    {
      "op": "init",
      "source": "manual-polygon",
      "data": [[[120,-70],[135,-70],[150,-70],[160,-70],[160,-65],[150,-65],[135,-65],[120,-65],[120,-70]]],
      "description": "Best guess at extent of DumontDUrville timezone based off of map at https://en.wikipedia.org/wiki/Time_in_Antarctica, but subtracting area for Concordia Station (Australia/Perth)."
    }
  ],

From this description, we see that Australia/Perth is there because of Concordia Station.

According to Wikipedia's list of south pole stations, Concordia is at UTC+10, but I have not (yet) found a source for why that is.

jannikmi commented 3 years ago

Thank. That is what I imagined.

evansiroky commented 3 years ago

Closing until further information can be provided to indicate what correction is needed.