[georss] raster images and relationshiptag

[Josh@oklieb]

Thinking about this, I can see cases for two alternatives:

1) Allow / suggest optional rss:enclosure or atom:link element(s)  
inside of georss:where so that the link to be associated with the  
location is clear. This could also be used to reference a web map  
context document or the map view most useful for interpreting the  
located content of the item / entry. This makes sense where the  
handler for the linked resource has to be geo-aware anyway. The  
atom:link element is more useful here since it includes "rel"  
attribute which can identify what the resource represents. It does  
have the complication of requiring rss and atom schemas to be  
referenced from georss (complicated in that normative XML Schema for  
these does not exist).

2) Allow / suggest georss:where or more likely georss:point /  
georss:box as content for  rss:enclosure or atom:link elements. This  
would more clearly provide an optional location for existing media  
references, easier for a non-geo feed processor to deal with. This  
does require a somewhat "non-standard" extension to rss or atom,  
since content for the enclosure or ink elements is undefined and  
extension points are only defined in atom for the feed, entry, and  
person elements.

These are probably not exclusive alternatives, but are valuable for  
different situations.

-Josh

On May 19, 2006, at 9:04 AM, Josh at oklieb wrote:

> Interesting idea. Could you provide an example of a feed using  
> this? People are clearly using RSS to reference a variety of media  
> resources (e.g. podcasts) and it would be important to support  
> interoperable ways of clearly associating a location to the  
> referenced resource so that a client can throw them on a map with  
> both an interpretable style and the right links.
>
> BTW, the tag in the georss schema is named "relationshipTag"...
>
> Cheers,
>
> Josh Lieberman
>
> On May 19, 2006, at 6:26 AM, Mikel Maron wrote:
>
>>
>> Anselm Hook and I were talking here at XTech about rasters in  
>> GeoRSS, and came up with a use for the "relationshiptype" tag, to  
>> specify that a box geometry designates the bounding box of an  
>> image refernced in a RSS item. For example..
>>
>> <entry>
>>   <title>Georeferenced Image</title>
>>   <id>#1234</id>
>>
>>   <georss:where relationshiptype="image-extent">
>>     <gml:Envelope>
>>        <gml:lowerCorner>42.943 -71-32</gml:lowerCorner>
>>        <gml:upperCorner>43.039 -69.856</gml:upperCorner>
>>     </gml:Envelope>
>>   </georss:where>
>>  </entry>
>>
>> This seems like it could be pretty useful, but not something I've  
>> thought of before. For example, many people were sharing aerial  
>> images of New Orleans post-hurricane in KML. Imagine being able to  
>> subscribe to a feed in a disaster zone, containing polygons and  
>> points of affected areas, locations of aid delivery points, and up  
>> to date imagery.
>>
>> Thoughts?
>>
>> -Mikel
>>
>>
>>
>>
>>
>>
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