Re: long/lat - timezone map
Iain Truskett schreef dat Nick Ing-Simmons schreef: Does anyone know of a machine-readable map that can convert lat/lon to timezone? There has been some discussion about this on the Olson db mailing list. The archive of this list can be downloaded from ftp://elsie.nci.nih.gov/pub/ . You can try to contact Chuck Ellis, who made such a map in 1997. On http://www.mindspring.com/~gwil/tz.html you can find much geographical data extracted from the Olson db. That could be useful if you want to make your own map. Eugene
Re: long/lat - timezone map
At 9:42 AM +1000 1/8/03, Iain Truskett wrote: Does anyone know of a machine-readable map that can convert lat/lon to timezone? Mac uses a map, you click on the map and it tells you the time at that place in the world. Of course it's closed source so we can't get a copy of it :( I remember that this was asked somewhere else .. here or someplace else. There's an online map at http://www.worldtimezone.com/ but it's not 'clickable' to select a timezone. While converting a lat/lon to a timezone would be close to impossible, I'm willing to work on a clickable HTML or Flash map. The problem with converting lat/lon is that countries are not geometric shapes where it would be easy to determine if a particular lat/lon is within that country. Cheers! Rick -- There are 10 kinds of people: those that understand binary, and those that don't. The day Microsoft makes something that doesn't suck is the day they start selling vacuum cleaners Write a wise proverb and your name will live forever. -- Anonymous
Re: long/lat - timezone map
I think it would be useful to make a set of TZ aliases per country... like the US/Eastern, etc. stuff but for every country. It would be even more useful to be able to break it down further as needed (state by state and county by county as needed). But that is a lot of work. -ben On Fri, Aug 01, 2003 at 10:05:12AM +1000, Rick Measham wrote: At 9:42 AM +1000 1/8/03, Iain Truskett wrote: Does anyone know of a machine-readable map that can convert lat/lon to timezone? Mac uses a map, you click on the map and it tells you the time at that place in the world. Of course it's closed source so we can't get a copy of it :( I remember that this was asked somewhere else .. here or someplace else. There's an online map at http://www.worldtimezone.com/ but it's not 'clickable' to select a timezone. While converting a lat/lon to a timezone would be close to impossible, I'm willing to work on a clickable HTML or Flash map. The problem with converting lat/lon is that countries are not geometric shapes where it would be easy to determine if a particular lat/lon is within that country. Cheers! Rick -- There are 10 kinds of people: those that understand binary, and those that don't. The day Microsoft makes something that doesn't suck is the day they start selling vacuum cleaners Write a wise proverb and your name will live forever. -- Anonymous
Re: long/lat - timezone map
I said: The problem with converting lat/lon is that countries are not geometric shapes where it would be easy to determine if a particular lat/lon is within that country. But now I've found the data! Problem is that each country is made up of a group of polygons. Each point on the polygon is in lat/lon format. However we can't really use this data. It's country specific (rather than sub-country, which we need for TZ). The other problem is size. For example, the polygons for Australia are 2.3MB of text! Still looking .. Cheers! Rick -- There are 10 kinds of people: those that understand binary, and those that don't. The day Microsoft makes something that doesn't suck is the day they start selling vacuum cleaners Write a wise proverb and your name will live forever. -- Anonymous
Re: long/lat - timezone map
At 11:23 AM +1000 1/8/03, Iain Truskett wrote: * Rick Measham ([EMAIL PROTECTED]) [01 Aug 2003 11:09]: [...] But now I've found the data! Problem is that each country is made up of a group of polygons. Each point on the polygon is in lat/lon format. However we can't really use this data. It's country specific (rather than sub-country, which we need for TZ). The other problem is size. For example, the polygons for Australia are 2.3MB of text! URL? Oops! http://www.maproom.psu.edu/dcw/ Cheers! -- There are 10 kinds of people: those that understand binary, and those that don't. The day Microsoft makes something that doesn't suck is the day they start selling vacuum cleaners Write a wise proverb and your name will live forever. -- Anonymous
