If I buy a Garmin receiver that has GPS internally and it displays a
particular location, I would not expect the quantity displayed to be any
different on a model that is identical other than using Galileo
internally.
The "secret business" between the receiver and the satellites is not the
same as the application/presentation. I believe the discussion is around
a simplified encoding for Internet applications. Why can't we settle,
for now, on a single reference system for Internet applications?
Cheers,
Martin
-----Original Message-----
From: geopriv-bounces@ietf.org [mailto:geopriv-bounces@ietf.org] On
Behalf Of Thomson, Martin
Sent: Thursday, 4 June 2009 11:18 AM
To: Carl Reed; Alexander Mayrhofer; GEOPRIV; vcarddav@ietf.org
Subject: Re: [Geopriv] [VCARDDAV] The "geo" URI draft
I can verify. Galileo will _NOT_ use WGS84, but for all practical
purposes, the CRS that they intend to use will be the same. Differences
are likely to be in the order of a centimetre.
Conversion is in theory necessary, but only for extreme cases. In most
cases, coordinates will be close enough that the difference has no
practical impact.
> -----Original Message-----
> From: geopriv-bounces@ietf.org [mailto:geopriv-bounces@ietf.org] On
> Behalf Of Carl Reed
> Sent: Thursday, 4 June 2009 1:25 AM
> To: Alexander Mayrhofer; GEOPRIV; vcarddav@ietf.org
> Subject: Re: [Geopriv] [VCARDDAV] The "geo" URI draft
>
> I can check.
>
> Carl
>
> ----- Original Message -----
> From: "Alexander Mayrhofer" <alexander.mayrhofer@nic.at>
> To: "GEOPRIV" <geopriv@ietf.org>; <vcarddav@ietf.org>
> Sent: Wednesday, June 03, 2009 7:18 AM
> Subject: Re: [Geopriv] [VCARDDAV] The "geo" URI draft
>
>
> >
> >
> >> Also, the forthcoming Galileo system:
> >>
> >> <http://en.wikipedia.org/wiki/Galileo_positioning_system>
> >>
> >> will not, I understand, use WGS84.
> >
> > I don't claim to be an expert in reference systems / geopotential
> models
> > etc. so please take the following information with caution (Carl? ;)
> >
> > I couldn't find any information about the reference system that
> Galileo
> > uses on the wikipedia page. However, a bit of research shows that
> > Galileo seems to use ITRF ("International Terrestrial Reference
> Frame"),
> > which, however, seems to be practically identical to WGS84,
according
> to
> > http://www.dqts.net/wgs84.htm (web site by EUROCONTROL). Also, this
> >
>
http://www.cambridgeconference.com/2007_conference_information/Conferen
> c
> > e%20proceedings/w2_5_cross.pdf presentation notes on slide 15 that
> > "WGS84 and IRTF are aligned".
> >
> > Which means that Galileo will use a reference system that is
> practically
> > identical to WGS84.
> >
> > Again, Disclaimer: i'm not an expert in this field.
> >
> > Alex
> > _______________________________________________
> > Geopriv mailing list
> > Geopriv@ietf.org
> > https://www.ietf.org/mailman/listinfo/geopriv
> _______________________________________________
> Geopriv mailing list
> Geopriv@ietf.org
> https://www.ietf.org/mailman/listinfo/geopriv
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