Re: Position Heading Questions?

Hi Greg, Martin
It has been already proposed, please read this thread:
http://lists.w3.org/Archives/Public/public-geolocation/2008Oct/0017.html

I suggested (with little success :-) ) the use of two new parameters, the
"facing" or azimuth (taken from the compass) and the "elevation angle"
(taken from accelerometers) corresponding to the horizontal coordinate
system (http://en.wikipedia.org/wiki/Horizontal_coordinate_system)<http://en.wikipedia.org/wiki/Horizontal_coordinate_system>

I know it is not exactly location, it is device orientation, but it could be
useful for some location-aware applications. It could be used for example to
identify stars or constellations in a hypothetical sky-map system or any
"point-to-identify" application.

Regards,

Angel

On Sun, Nov 16, 2008 at 5:14 PM, Thomson, Martin
<Martin.Thomson@andrew.com>wrote:

> Hi Greg,
>
> We've addressed a similar problem in the IETF [1].
>
> Essentially, there are use cases for having both.  Best example I know of
> is where someone is travelling past a store in a car.  They point their
> device at the store and press the "what store is that" button.  I know that
> this sort of thing is already used in some places.  Having both pieces of
> information is very useful.  Either one on its own might be misleading.
>
> My proposal:
>
> facing // 0th order: degrees
> speed // 1st order: m/s
> heading // 1st order: degrees
>
> The referenced draft currently has two more, but those are still being
> debated and might be removed:
>
> acceleration // 2nd order: m/s
> acceleration heading // 2nd order: degrees
>
> Cheers,
> Martin
>
> [1] http://tools.ietf.org/html/draft-singh-geopriv-pidf-lo-dynamic
>
> > -----Original Message-----
> > From: public-geolocation-request@w3.org [mailto:public-geolocation-
> > request@w3.org] On Behalf Of Greg Bolsinga
> > Sent: Saturday, 15 November 2008 3:47 PM
> > To: public-geolocation
> > Subject: Position Heading Questions?
> >
> >
> > Hello --
> >
> > The Position object has a heading field. It is described as: "The
> > heading attribute denotes the direction of the hosting device". Is
> > this the heading of the vector of travel while moving, or the
> > direction the user is currently facing, no matter the direction of
> > travel? The context of the following field, speed, seems to indicate
> > that this is the heading of the direction of travel.
> >
> > However, I can see the use for a 'which way is the device oriented'
> > compass-style heading, as well as the direction you're traveling in.
> > One can be facing backwards to the direction of travel! :)
> >
> > What do you think? I think having both fields is fun, but I'm not sure
> > what heading has to do with a location specification if I was going to
> > be really picky about it. :) No matter what, I think the Position
> > object's heading description needs to be clarified. I'd also like both
> > types of headings to be available, both with the "If the
> > implementation cannot provide speed information, the value of this
> > attribute must be null." wording.
> >
> > Thanks,
> > -- Greg
> >
> >
>
>
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