[georss] Can GeoRSS and KML converge on a geometry encoding?

[David Burggraf]

Josh, what do you mean by 'eventually in KML'. The CRS specified in KML has always been a lon/lat/alt Geographic CRS, but just recently formally specified in OGC V2.2--it is analogous to the 2D Geographic CRS OGC:CRS84, but 3D. The alt values, when not specified default to 0.

David.

-----Original Message-----
From: georss-bounces at lists.eogeo.org on behalf of Joshua Lieberman
Sent: Thu 10/04/2008 08:53
To: GeoRss georss at lists.eogeo.org
Subject: Re: [georss] Can GeoRSS and KML converge on a geometry encoding?
 
Sean,

3D position lists are entirely allowed in GeoRSS GML. It simply  
requires specifying a 3D CRS, just as in GML and eventually in KML.  
This is an additional option from GeoRSS Simple, which doesn't provide  
a place for additional CRS's.

The 3D equivalent to epsg:4326 I believe is epsg:4979:


<georss:where>
<gml:Point>
<gml:pos srsName="epsg:4979" srsDimension="3">42.3453 -156.2342 45</ 
gml:pos>
</gml:Point>
</georss:where>

--Josh

On Apr 10, 2008, at 11:03 AM, Sean Gillies wrote:

> I'm not thinking about arcs and hemispherical patches, or 3D
> visualization, but about dimensionality of positions. 3D position  
> lists
> are not allowed in GeoRSS GML, are allowed in KML 2.2, and I imagine
> that they will be an option in KML 3. Some of you have the inside  
> track
> on KML, right? I'm just suggesting we could steer GeoRSS to where  
> KML is
> headed.
>
> #geo-web-rest on freenode
>
> http://groups.google.com/group/geo-web-rest/web/atom-geo-interop-the-2nd
>
> Sean
>
> Joshua Lieberman wrote:
>> GeoRSS GML already uses GML 3 geometries, just not all possibilities.
>> KML, if/when it supports GML 3, is unlikely as well to support all
>> possible GML 3 geometries. There are specific options in KML for 3D
>> handling, though, which are not in GML at all. I was just suggesting
>> earlier that providing a place for them to be expressed in GeoRSS
>> might make it more straightforward for GE to handle feeds and KML
>> together.
>>
>> Sean, are you and Charlie going to make some sort of a conference
>> line / IRC channel available tomorrow, or should we try to do
>> something more inclusive at another time (e.g. next week).
>>
>> -Josh
>>
>> On Apr 10, 2008, at 10:14 AM, Sean Gillies wrote:
>>
>>> Andrew, you reported in your blog last fall that KML may switch over
>>> to
>>> GML 3 geometries. If that were true, wouldn't it make sense for the
>>> next
>>> iteration of GeoRSS to recommend the same practice? Seems to me this
>>> could simplify the situation for feed and KML processors.
>>>
>>> Sean
>>> _______________________________________________
>>> georss mailing list
>>> georss at lists.eogeo.org
>>> http://lists.eogeo.org/mailman/listinfo/georss
>>
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>
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