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

Wed Jun 8 18:42:34 BST 2016

I found a shapefile of the timezones of the world:
http://efele.net/maps/tz/world/


On 06/08/2016 03:17 AM, Colin Smale wrote:
>
> 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 Eastern/Central/Mountain/Pacific/Alaska/Hawaii...
>
> //colin
>
> [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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