On Sep 23, 2013, at 9:05 AM, carlisle thacker wrote: > Gabor, > > Thanks for your tip about zone.tab. It provides country codes and > lat/lon of the zone's principal location, which while useful is not > exactly what I need. I would like to know the coordinates of time > zone boundaries. Better still would be a function, which returns > the name of the time zone in which given lat/lon is situated. > > For example, in which time zone is 22N,166W? And at what times of > year might daylight savings time be in effect?
From the posting from Olivier Eterradossi: library(geonames) GNtimezone(22,166) #---------------- Loading required package: rjson rawOffset dstOffset gmtOffset lng lat 1 11 0 11 166 22 Warning message: In readLines(u) : incomplete final line found on 'http://ws.geonames.org/timezoneJSON?lat=22&lng=166' So it looks like the middle of the Pacific (GMT-11) near Hawaii. Seems a reasonable result. -- David > Regards, > > Carlisle > > > On Sat, Sep 21, 2013 at 3:17 AM, Gabor Grothendieck <ggrothendi...@gmail.com > > wrote: > On Fri, Sep 20, 2013 at 4:31 PM, carlisle thacker > <carlisle.thac...@gmail.com> wrote: > > I was looking for something like shown on the map: > > http://upload.wikimedia.org/wikipedia/commons/8/88/World_Time_Zones_Map.png > > > > Information about local daylight savings times would also help. > > > > The data are from ships, supposedly in local time, but no time- > zone info is > > given. A function that would return time zone and whether or not > daylight > > savings time applies at given date would would help. I'm trying > to track > > down more information about the data and whether they can be > referenced to > > UTC. > > The zone.tab file has this information. See the Examples section at > the end of ?Sys.timezone for info on its whereabouts. > David Winsemius, MD Alameda, CA, USA [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
