Re: Work on Core Address vocabulary

Hi Bart and Phil,
Distance between Addresses in WGS84 is pretty straightforward because "the geoid" has real valued locations and polar singularities.  This breaks down if your coordinate system uses a continuous longitude (tau*) and thereby get a continuous latitude unhampered by the pole.  My ISO Day # fit illustrates the problem.  Governments set a Summer Time midpoint (always a Sunday) and implement Daylight Savings as an offset. The US uses a 1/4 Year + 28 Days, Europe a 1/4 + 21 Days (or -7).  Australia same as the EU and there are probably other schemes for handling the 28 day wave period.  These sorts of half year adjustments are harmless ... except for Communities and local distance measurements.  By dividing the year in half, there is some unintended systemic inflation of distance which cannot be replicated the next year.  I'm all in favour of Continental Drift and Atmospheric Refraction, but I don't notice them finding coffee in the morning.  If you use
 the Haversine Formula (Great Circle Navigation) and the 28 day wave, that is exactly what happens to your statistics.  I'm making some pretty pictures and curve fits at the moment.  I'll release them when it's clear I'm fixing an asymmetry problem rather than pushing an odd "theory".
--Gannon



* http://www.bbc.co.uk/news/science-environment-13906169


________________________________
 From: Phil Archer <phila@w3.org>
To: Bart van Leeuwen <Bart_van_Leeuwen@netage.nl> 
Cc: "public-locadd@w3.org" <public-locadd@w3.org> 
Sent: Sunday, April 21, 2013 10:58 AM
Subject: Re: Work on Core Address vocabulary
 

Hi Bart,

Make sure you talk to Andrea and Michael in London this week!

Phil.





> Hi,
>
> I've seen several mails about GEO related topics, but the other goal of
> this group was also to look at address encoding.
>
> There is already a some proposal done by the joinup program in the Core
> location vocabulary [1].
> In the GLD [2] of which I'm a member as well, we already reserved a name
> space in the w3c namespace [3].
>
> I would be very happy if we could move this forward as well.
>
> [1]
> https://joinup.ec.europa.eu/asset/core_location/asset_release/core-location-vocabulary-100
> [2] http://www.w3.org/2011/gld/wiki/Main_Page
> [3] http://www.w3.org/ns/locn#
>
> Met Vriendelijke Groet / With Kind Regards
> Bart van Leeuwen
> @semanticfire
>
> ##############################################################
> # netage.nl
> # http://netage.nl
> # Enschedepad 76
> # 1324 GJ Almere
> # The Netherlands
> # tel. +31(0)36-5347479
> ##############################################################


-- 

Sent from my phone. Please excuse typos.