[OSM-dev] Request for PHP programmers for TWISST project

andrzej zaborowski balrogg at gmail.com
Fri Oct 1 23:05:57 BST 2010

On 1 October 2010 22:32, David James <david at djames.org.uk> wrote:
>  On 01/10/2010 17:14, andrzej zaborowski wrote:
>> On 1 October 2010 18:12, andrzej zaborowski<balrogg at gmail.com>  wrote:
>>> Checking if a point is inside a polygons is trivial, but is it what
>>> they really want?  Wouldn't just the longitude tell you the time
>>> better than the timezone?
>>> E.g. offset_from_gmt = ((lon - 180) / 15) hours
>> oops, rather (lon / 15) hours
> Timezone boundaries do not exactly follow lines of longitude (Google finds a
> nice map here: http://www.travel.com.hk/region/timezone.htm).

Yes, that's my point. The longitude is likely a better indicator of
when people are active than the timezone (judging mostly from what
time people tend start the day at the two ends of the European
GMT+1/+2 strip.)


More information about the dev mailing list