Re: [uk-government-data-developers] Couple of Ordnance Survey things

Hi Alex,

Thank you for joining the conversation!

The topic of coordinate systems (if they are adequate or inadequate) and 
how they might be extended or adopted with/for AR applications has been 
raised (is still a potential topic of discussion) on this list.

You might want to scan some of the archives of the list [1] between Aug 
2-13 to catch up with the points which were made by members of the list 
on that topic.

It is a multi-faceted topic even at the center of the debate over what 
the group should call itself and its mission. I don't believe the matter 
has been resolved to the total satisfaction of all members of the group. 
It may never be.

GUIDs have not been a topic of discussion (yet). In prowling around on 
the topic, I found [2]. Looks to be about 22 months since there was any 
movement on this. This work done in the IETF [3] expired in Aug 1998.

Is there a UUID or GUID expert on the list who can shed some light on 
how GUIDs might or might not be suitable for AR?

-- 
Christine

Spime Wrangler

cperey@perey.com
mobile +41 79 436 68 69
VoIP (from US) +1 (617) 848-8159
Skype (from anywhere) Christine_Perey

[1] http://lists.w3.org/Archives/Public/public-poiwg/
[2] http://openguid.net/specification
[3] http://www.opengroup.org/dce/info/draft-leach-uuids-guids-01.txt

On 8/20/2010 4:13 PM, Alex Hill wrote:
> Sorry for the delay in weighing in.
> Please let know if I am not following any protocol.
>
> On Aug 18, 2010, at 6:27 AM, Dan Brickley wrote:
>
>> Might be of interest here, re current trends/activities...
>>
>> Dan
>>
>>
>> ---------- Forwarded message ----------
>> From: John Goodwin <John.Goodwin@ordnancesurvey.co.uk
>> <mailto:John.Goodwin@ordnancesurvey.co.uk>>
>> Date: Wed, Aug 18, 2010 at 12:23 PM
>> Subject: [uk-government-data-developers] Couple of Ordnance Survey things
>> To: uk-government-data-developers@googlegroups.com
>> <mailto:uk-government-data-developers@googlegroups.com>
>>
>>
>>
>> Hi all,
>>
>> The OS OpenSpace Wiki is now live:
>>
>> http://osopenspacewiki.ordnancesurvey.co.uk/wiki/index.php?title=Main_Page
>>
>> and the TOID lookup service is now back up and running:
>>
>> http://opentoids.ordnancesurvey.co.uk/toidservice/
>>
>> example:
>>
>> http://opentoids.ordnancesurvey.co.uk/toidservice/location/300000,300000
>
> Does this effort seek to assign a GUID to each physical object
> (buildiings, lakes, etc.)?
> I find this very interesting since I feel that only being able to refer
> to coordinates in space is inadequate for AR.
> It might suffice for the current crop of applications, but I imagine a
> future where content is very tightly registered with the content in the
> physical world.
> For one thing, no one wants to author a sign on the top of a store by
> climbing to the roof (if accessible) and determining the coordinates.
> And, authoring content on the side of a vehicle means referring to the
> vehicle and not any specific coordinates.
> Another reason I am in favor of a GUID is that I suspect there will be
> numerous competing representations of buildings and structures to choose
> from.
> And, given multiple databases providing model data (likely) for
> structures, one would want to avoid collisions (i.e. two models of the
> same building visible).
> A GUID aids some of the discussions about where content is meant to be
> placed (i.e on the corner of 5th and Spring, in the middle of the
> courtyard).
> Does one want to associate their content with -85.0,34.0 or at the Klaus
> Computing building?
> Both have different semantic meanings and practical consequences.
> I'd also like to call into question this whole concept of giving
> buildings and structures coordinates.
> Although the utility on a map is obvious, the practical value of a
> floating tag at the exact center of a building is unclear when on is
> viewing a small section of it.
> The actual "location" of a building needs to be tied to the "extent" of
> that structure and hence to the "officially accepted model" of that
> structure (and it's origin's relation to the coordinates).
> Granted, a combination of a model and coordinates is likely sufficient,
> but this just highlights that coordinates in themselves are inadequate
> for any real AR application.
>
>>
>> see British National Grid for more coordinates:
>>
>> http://www.ordnancesurvey.co.uk/oswebsite/images/userImages/misc/education/nationalgrid/natgrid2.gif
>>
>> John
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>>
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>>
>> Thank you for your cooperation.
>>
>> Ordnance Survey
>> Romsey Road
>> Southampton SO16 4GU
>> Tel: 08456 050505
>> http://www.ordnancesurvey.co.uk
>>
>
> Alex Hill Ph.D.
> Postdoctoral Fellow
> Augmented Environments Laboratory
> Georgia Institute of Technology
> http://www.augmentedenvironments.org/lab
>

Received on Monday, 23 August 2010 11:38:26 UTC