[georss] [Opensearch-discuss] Spatio-temporal query extension

[Stefan F. Keller]

David wrote:
> One way to get started on this would be miny, maxy, minx, maxx querystring
> parameters.

This example sounds similar to what I proposed to wms-dev for
standardization recently to launch a WMS client/viewer
http://domain.org/wmsclient?lat=47.268&lon=-8.780&zoom=12&wmsurl=<wmsBaseURL
>
You see there that in addition to a bbox query there is a center point and
an (optional) zoom factor.

Be aware of the use case though: The response of these examples are
parametrised webapplications. But what we rather expect here is an XML file
in an online distributed query. This is opposed to harvesting where there
are existing protocols like WFS simple or OAI-PMH (see e.g.
http://gis.hsr.ch/wiki/OAI-PMH for a comparison).

So, for online distributed queries consider perhaps WFS simple (too) or
http://www.loc.gov/standards/sru/ which all already have spatio-temporal
query capabilities.

--- Stefan

2007/3/15, Pat Cappelaere <pat at cappelaere.com>:
>
> Yes.  I guess this could be via the proposed bbox query.
> A smart FF plugin might be able to detect that a search engine has that
> capability and offer a map interface to specific the bbox in addition to
> keyword search.  This would be way cool.
>
> We would need to agree on namespace, parameters...
> This OpenSearch extension might not be too hard based on the examples
> provide by deWitt.  Might be harder to get everyone to agree :)
>
> There was a lot of discussion with the georss.org group with microformats.
> This group, as you may know, has proposed an extension of the Atom/RSS
> format to support geospatial information.  This would be, of course, what
> those servers would return in our case.
>
> Would be great to have them onboard.
>
> Pat.
>
>
> > From: "Shorthouse, David" <dps1 at ualberta.ca>
> > Date: Wed, 14 Mar 2007 08:58:49 -0600
> > To: 'Mike Rylander' <mrylander at gmail.com>, Pat Cappelaere <
> pat at cappelaere.com>
> > Cc: <opensearch-discuss at opensearch.org>
> > Subject: RE: [Opensearch-discuss] Spatio-temporal query extension
> >
> > One way to get started on this would be miny, maxy, minx, maxx
> querystring
> > parameters.
> >
> > e.g.
> > http://canadianarachnology.dyndns.org/data/canada_spiders/gmapbounds.asp
> >
> > David P. Shorthouse
> > ------------------------------------------------------
> > Department of Biological Sciences
> > CW-403, Biological Sciences Centre
> > University of Alberta
> > Edmonton, AB   T6G 2E9
> > mailto:dps1 at ualberta.ca
> > http://canadianarachnology.webhop.net
> > http://arachnidforum.webhop.net
> > http://www.spiderwebwatch.org
> > ------------------------------------------------------
> >
> >
> > On 3/13/07, Pat Cappelaere <pat at cappelaere.com> wrote:
> >> I would like to use OpenSearch and extend it to support spatio-temporal
> >> queries.
> >> Example: bbox=lat1,long1,lat2,long2
> >>          from=datetime, to=datetime
> >>
> >> Has anyone done anything like that?
> >> This would be a great step forward for searching geospatial data nodes.
> >> I would appreciate feedback.
> >
> > That sounds like a great extension, actually, and something I'd like
> > to implement eventually.  The one other thing that I'd really like
> > would be the option of a bounding circle defined by point and radius.
> > Often that's the right way to find entries "within X miles" and such.
> >
> > Do you have a demo implementation at this point?
> >
> >> Pat.
> >>
> >
> >
>
>
> _______________________________________________
> georss mailing list
> georss at lists.eogeo.org
> http://lists.eogeo.org/mailman/listinfo/georss
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.eogeo.org/pipermail/georss/attachments/20070315/1a494ad4/attachment.html