On Monday 2017-03-06 14:15 -0500, Richard Welty wrote: > On 3/6/17 11:21 AM, Paul Johnson wrote: > > On Mar 5, 2017 18:30, "Frederik Ramm" <frede...@remote.org > > <mailto:frede...@remote.org>> wrote: > > > > Hi, > > > > I would like to start a discussion about the mapping of time zones. > > > > > > What do you think? > > > > > > I'm generally opposed to mapping timezones in OpenStreetMap unless the > > tzdata maintainers are 100% on board. Since timezones are a royal > > pain to keep track of, often changing 100+ times a year, on as little > > as a few hours notice in some cases. > > > i agree. this a perfect example of something that belongs in its own > database or > shape file, available to be overlaid on the map when it's wanted.
For what it's worth, data of this sort are maintained at http://efele.net/maps/tz/ , although the shapefiles there (based on VMAP0) are somewhat inferior to OSM data, since a number of the national boundaries (e.g., using the Sudanese claim for the Egypt/Sudan border) or coastlines (e.g., Aral Sea) are quite out of date, in ways that are noticeable when overlaying the data. Apparently the http://efele.net/maps/tz/world/tz_world_ingredients.zip file there has information that could be used to rebuild the shapefiles on top of other sources of data, but I've never attempted to do this. -David -- ๐ L. David Baron http://dbaron.org/ ๐ ๐ข Mozilla https://www.mozilla.org/ ๐ Before I built a wall I'd ask to know What I was walling in or walling out, And to whom I was like to give offense. - Robert Frost, Mending Wall (1914)
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