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
carlisle thacker carlisle.thacker at 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 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.
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
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()
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) :
On Sat, Sep 21, 2013 at 10:25 AM, David Winsemius
dwinsem...@comcast.net 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
carlisle.thac...@gmail.com wrote:
I was looking for
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 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
On 21/09/2013 08:17, Gabor Grothendieck 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
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
carlisle.thac...@gmail.com wrote:
I was looking for something like shown on the map:
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
[[alternative HTML version deleted]]
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
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
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