[Geodata] Re: [georss] KML into OGC - OpenSearch for SWE

[Pat Cappelaere]

Gregor,

Agree.  I would love to see geospatial extensions to OpenSearch.
We currently have data nodes that can output GeoRSS feeds based on
WFS-Simple queries at http://eo1.geobliki.com

The current WFS-Simple filtering is anemic.  So using it for distributed
search is a non-starter.  It is also non-FireFox mainstream (so non-mass
market).  Given that FF has an opensearch plugin, this opensearch capability
would be extremely attractive to us (and easy to discover)

It would not matter what you search, regular nodes or geospatial-enabled
nodes.

If we could come up with some geoextensions queries to OpenSearch (we
already have the GeoRSS ouptuts), I am willing to implement it on GeoBliki
and for everyone try and search for EO-1 imagery.

Pat.


> From: "Gregor J. Rothfuss" <gregor at apache.org>
> Date: Sun, 04 Mar 2007 19:52:15 -0500
> To: "Stefan F. Keller" <sfkeller at gmail.com>
> Cc: Pat Cappelaere <pat at cappelaere.com>, <geodata at lists.osgeo.org>,
> <georss at lists.eogeo.org>, <dewitt at unto.net>
> Subject: Re: [georss] KML into OGC - OpenSearch for SWE
> 
> Stefan F. Keller wrote:
> 
>> Technically it's a small step to put some bbox inside dc:coverage and
>> make OAI Dublin Core (DC) attributes more machine readable and to me the
>> dozen DC are enough. But it seems to be the harder to reach consensus the
>> few(er) geometry types and object attributes must be (see also Jo Walch's
>> "Reading the INSPIRE metadata draft")...!
>> 
>> => Now, if we reach consensus about a minimal metadata information model
>> before negotiation with Google KML begins OGC could propose to include this
>> also in OGC-KML!!
> 
>>> I want to do a distributed [spatio-temporal] search query.  What are the
>>> options?
> 
>>> 1) I probably could extend the WFS filter and use it in an ad-hoc
>>> distributed way.  But this will only be at best understood by the SWE
>>> nodes.
>>> I would be loosing the other stuff.
>>> 2) KML Search?
>>> 3) OpenSearch but how to do the geospatial query?  What about time span
>>> queries?
>>> http://www.opensearch.org
>>> It does return Atom/RSS so it could potentially return GeoRSS!
>>> 
>>> So, has anyone considered a geospatial extension to OpenSearch?  Or has
>>> anyone another approach to the problem?
>>> Would this be something to consider under georss.org?
> 
> i would love geospatial extensions to opensearch, for all the reasons
> you mention.
> 
> google already has geospatial data in their gdata feeds, which use
> opensearch.
> 
> http://code.google.com/apis/gdata/elements.html#gdGeoPt
> 
> i recently talked to the gdata team, and they are willing to drop their
> proprietary gd:geoPt and move to georss. i will ping them to note
> gd:GeoPt being deprecated, and to please use georss instead on their
> documentation site.
> 
> but for playing around and getting a sense of what a geo-enabled
> opensearch feed could do, you should be able to use the existing gdata
> feeds with gd:GeoPt. you might be able to just use some google calendar
> feeds for that, as ogle earth suggests:
> 
> http://www.ogleearth.com/2006/04/rfm_request_for.html
> 
> http://www.programmableweb.com/url/5138
> http://www.mileagecalc.com/
> 
> look like mashups that make some use of gd:geoPt.
> 
> i also looked around for good opensearch feeds, but sadly, currently
> most are pretty useless. i think it is still early days for opensearch,
> and i believe more and better opensearch feeds will come out.
> 
> if anyone here has come across interesting opensearch feeds that would
> gain from having geo embedded, please share! maybe we can get these
> feeds upgraded with geo :)
> 
> dewitt, anything to add?
> 
> -gregor