On 23/09/2013 22:43, MacQueen, Don wrote:
The very first response, from Jeff Newmiller, included a link
http://efele.net/maps/tz/world/
which says it has offers a shapefile of timezones of the world.
An outline of a solution, then it to
download the shapefile
load it into R
input y
Thanks. This seems to return the correct offset. For example, it knows
about the time zone not following the meridian in this part of the Pacific:
> GNtimezone(14,-172)
rawOffset dstOffset gmtOffset lng lat
1 -11 0 -11 -172 14
Warning message:
In readLines(u) :
incomple
The very first response, from Jeff Newmiller, included a link
http://efele.net/maps/tz/world/
which says it has offers a shapefile of timezones of the world.
An outline of a solution, then it to
download the shapefile
load it into R
input your lat/long data into R
use the over() functi
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 zon
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.
carlisle thacker gmail.com> writes:
>
> I have data that provide longitude, latitude, and local date and time but
> no information about the corresponding time zone. How to identify the
time
> zone so they can be converted to a common date/time?
>
> Thanks,
>
> Carlisle
>
>
On Sat, Sep 21, 2013 at 10:25 AM, David Winsemius
wrote:
>
> On Sep 21, 2013, at 3:13 AM, Prof Brian Ripley wrote:
>
>> On 21/09/2013 08:17, Gabor Grothendieck wrote:
>>>
>>> On Fri, Sep 20, 2013 at 4:31 PM, carlisle thacker
>>> wrote:
I was looking for something like shown on the map:
On Sep 21, 2013, at 3:13 AM, Prof Brian Ripley wrote:
On 21/09/2013 08:17, Gabor Grothendieck wrote:
On Fri, Sep 20, 2013 at 4:31 PM, carlisle thacker
wrote:
I was looking for something like shown on the map:
http://upload.wikimedia.org/wikipedia/commons/8/88/World_Time_Zones_Map.png
Inform
On 21/09/2013 08:17, Gabor Grothendieck wrote:
On Fri, Sep 20, 2013 at 4:31 PM, carlisle thacker
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.
On Fri, Sep 20, 2013 at 4:31 PM, carlisle thacker
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
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
On Sep 20, 2013, at 8:02 AM, carlisle thacker wrote:
I have data that provide longitude, latitude, and local date and
time but
no information about the corresponding time zone. How to identify
the time
zone so they can be converted to a common date/time?
Perhaps as an approximation you c
If you make no further assumptions then this question is not solvable. For
example we use standard time in our data collection systems even though legal
time here applies daylight savings offset in the summer. In some cases I have
seen data collected from sites in multiple time zones recorded in
I have data that provide longitude, latitude, and local date and time but
no information about the corresponding time zone. How to identify the time
zone so they can be converted to a common date/time?
Thanks,
Carlisle
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