[Geojson] [georss] simple 3D geocode for AR

[Mike Liebhold]

Ron Lake wrote:
> The use of geographic coordinates for [location of things in the field of view relative to the camera]  likely does not. [ make sense]
>   

Ron,

This is really counter intuitive, Can you explain what you mean?

- Mike
>
> -----Original Message-----
> From: georss-bounces at lists.eogeo.org
> [mailto:georss-bounces at lists.eogeo.org] On Behalf Of Joshua Lieberman
> Sent: August 28, 2009 11:03 AM
> To: geowanking at geowanking.org
> Cc: geojson; GeoRSS
> Subject: Re: [georss] [Geojson] simple 3D geocode for AR
>
> In both GeoRSS GML and GeoJSON, some explicit CRS needs to be  
> specified to use 3-coordinate locations. The simplest one for GeoRSS  
> seems to be epsg:4979 ( urn:ogc:def:crs:EPSG:4979 ). It would need a  
> slight modification to support the GeoJSON long-lat encoding.  
> Otherwise use GeoRSS Simple and the elev property.
>
> e.g.
>
> <georss:elev>346</georss:elev>
> <georss:point>42.3234 -173.234134</georss:point>
>
> Well-known text description of 4979
> (http://spatialreference.org/ref/epsg/4979/ 
> )
> GEOGCS["WGS 84", DATUM["World Geodetic System 1984", SPHEROID["WGS 84", 
> 6378137.0,298.257223563, AUTHORITY["EPSG","7030"]],          
> AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich",0.0,  
> AUTHORITY["EPSG","8901"]], UNIT["degree",0.017453292519943295],  
> AXIS["Geodetic latitude",NORTH], AXIS["Geodetic longitude",EAST],  
> AXIS["Ellipsoidal height",UP], AUTHORITY["EPSG","4979"]]
>
> Josh
>
> On Aug 28, 2009, at 1:05 PM, Ron Lake wrote:
>
>   
>> Sorry my example should have been
>>
>> 	<Point id = "P1"  CRS = "http://www.blah.bla/standardCRS.xml">
>> 		<coordinates>100 200  150</coordinates>
>> 	</Point>
>>
>> But the argument is the same.  Similar encodings can be made in JSON
>> etc.
>>
>> R
>>
>> -----Original Message-----
>> From: georss-bounces at lists.eogeo.org
>> [mailto:georss-bounces at lists.eogeo.org] On Behalf Of Andrew Turner
>> Sent: August 28, 2009 9:57 AM
>> To: geowanking at geowanking.org; GeoRSS; geojson
>> Subject: Re: [georss] [Geojson] simple 3D geocode for AR
>>
>> Simplest?
>>
>> Just include a 3rd coordinate in GeoRSS-Simple point or GeoJSON point.
>>
>> No, this is not explicitly valid. But you see where that discussion
>> gets us. Long windy roads of elusive semantic talk (arguably necessary
>> in the lon term, but not simple or useable *now*, which is when people
>> are building these tools).
>>
>> If we lose interest without achieving a near term concensus,
>> developers will just do arbitrary, different solutions. Give them a
>> simple answer now, even if it makes your strict-validation-only-skin
>> crawl just a little bit. :)
>>
>> So I say just do it, and we'll catch up with documenting it as uses
>> emerge.
>>
>> Also, KML already supports 3D points.
>>
>> Andrew
>>
>>
>>
>> (via mobile)
>>
>> On Aug 27, 2009, at 4:35 PM, Mike Liebhold <mnl at well.com> wrote:
>>
>>     
>>> A friend wrote me with a request for clarification on a topic we've
>>> discussed many times here,  but every time we've approached a
>>> consensus the answer seems elusive.
>>>
>>> Many devleopers are starting to create applications for iPhones and
>>> Android phones to view location specific data  through the
>>> viewfinder using the -imprecise- capabilities of the built in gps
>>> and compass and applications platforms like Layar.
>>>
>>> The question:
>>>
>>> What is the -simplest- way to geocode a geoannotation in 3D using
>>> geoRSS/Atom, geojson, KML ....?
>>>
>>> (Is there a practical reason why WGS '84 shouldn't be implicit, and
>>> a CRS  lookup NOT be required?)
>>>
>>>
>>> _______________________________________________
>>> Geojson mailing list
>>> Geojson at lists.geojson.org
>>> http://lists.geojson.org/listinfo.cgi/geojson-geojson.org
>>>       
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>
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