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[mkgmap-dev] Has anyone added a USA TIMEZONE overlay ontop of their custom maps?

From Colin Smale colin.smale at xs4all.nl on Wed Jun 8 11:17:51 BST 2016

According to wikipedia, timezone boundaries seems to be a rather complex
subject in the USA, with some communities using an unofficial time as
well as many variations of the application of Daylight Savings time...
Indiana specifically is described in some detail on wikipedia [1]. 

I agree with Marko, it would be good to have this in OSM. One way of
doing it would be that the whole state of Indiana gets a "default"
timezone with exceptions on the level of individual counties, but this
would require some processing for the use case of "give the current UTC
offset for this location". I think having a separate system of boundary
relations (type=boundary, boundary=timezone) would be easier to process.
But there will be many, many more than just the well-known timezones


[1] https://en.wikipedia.org/wiki/Time_in_the_United_States

On 2016-06-08 11:38, Marko Mäkelä wrote:

> On Tue, Jun 07, 2016 at 09:36:37PM -0400, greg crago wrote: 
>> I do not know how to add adminstrative boundaries or relations, but it
>> would be nice if these were added to the USA. INDIANA is divided between cities and county boarders. I was just hoping someone had done this and I would like to add this info to my maps.
> Indiana http://www.openstreetmap.org/relation/161816 does not have a timezone=* yet. Maybe someone who is familiar with JOSM and the timezones could do this? Because I do not live in the US, I am reluctant to change the data myself. But I guess I could do it if nobody else steps up, and if you can provide me with a comprehensive list of states (counties, cities) and timezones.
> You see, I would want this data to be present in OSM, to benefit also other users than those using mkgmap-generated maps. If we have the data in OSM and if mkgmap starts to interpret it, then you would get the timezone borders "out of the box". I do not think that timezone borders would add any significant clutter to the map, so IMO they should be included in the default style.
> Marko
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