[georss] Time and Space

[Ron Lake]

Mike:

 

If you do that - allow multiple geometries inside a single "where"
property - how does anyone know what they mean?  In GML a property (like
where) is used to describe the role of the geometry - e.g. 

 

            <abc:centerLine>

                        <gml:LineString> ... </gml:LineString>

            </abc:centerLine>

            <abc:position>

                        <gml:Point>... </gml:Point>

            </abc:Point>

 

How does that work in GeoRSS?  How do you know the roles of Point and
LineString otherwise?

 

Cheers


Ron

 

________________________________

From: georss-bounces at lists.eogeo.org
[mailto:georss-bounces at lists.eogeo.org] On Behalf Of Mikel Maron
Sent: February 12, 2007 11:50 AM
To: Knoth, Brian D.; georss at lists.eogeo.org
Subject: Re: [georss] Time and Space

 

Brian

There was a thread on this last month that went into the issues ..
http://lists.eogeo.org/pipermail/georss/2007-January/

But I should've been more specific .. you can include any kind of GML
payload in GeoRSS GML, which could have multiple geometries,
but those all would be included in a single georss:where.

-Mikel



----- Original Message ----
From: "Knoth, Brian D." <bknoth at mitre.org>
To: Mikel Maron <mikel_maron at yahoo.com>; georss at lists.eogeo.org
Sent: Monday, February 12, 2007 7:41:39 PM
Subject: RE: [georss] Time and Space

Mikel,

 

I'll take a look at your links in a moment, but just quickly wanted to
respond to the issue of not being able to have multiple <georss:where>
nodes under an <item>. I know that I read this restriction somewhere
else and my only question is simply why not?  I don't know of any
restriction defined in the RSS specification that limits child elements
to only a single occurrence, is there?

 

thanks,

brian

	 

	
________________________________


	From: Mikel Maron [mailto:mikel_maron at yahoo.com] 
	Sent: Monday, February 12, 2007 2:38 PM
	To: Knoth, Brian D.; georss at lists.eogeo.org
	Subject: Re: [georss] Time and Space

	Hi Brian
	
	I'm very interested in incorporating time, visualizing and
acting on change. Gave a presentation outlining some thoughts on this
foss4g..
	
http://www.foss4g2006.org/contributionDisplay.py?contribId=161&sessionId
=47&confId=1
	
	Like Raj, I think time could be seen as having wider application
than just space. I've re-used the RSS and Atom time-oriented fields for
some
	basic stuff.
	
	http://worldkit.org/doc/time.php
	
	For richer time specifications, there hasn't been agreement on a
single encoding. Upcoming.org has a bit to say on this..
	
	
http://community.upcoming.org/w/index.php/Nerdy_Questions#What_are_the_g
uidelines_you_follow_when_creating_RSS_feeds.3F
	
	They're using xCal. There's also an old RSS 1.0 module called
Event .. http://web.resource.org/rss/1.0/modules/event/
	
	
	While writing this I just saw your followup. One thing about
your usage, you can't associate multiple georss:where elements with a
single item;
	it's a one to one relationship. 
	
	Best
	-Mikel

	----- Original Message ----
	From: "Knoth, Brian D." <bknoth at mitre.org>
	To: georss at lists.eogeo.org
	Sent: Monday, February 12, 2007 1:40:54 PM
	Subject: [georss] Time and Space

	Hi,
	
	I'm new to this mailing list, yet have been advocate of RSS and
geoRSS
	on some internal projects for a while. I do have a few concerns
with
	regard to real practical acceptance of geoRSS, yet, I understand
the
	need to try and balance simplicity and expressiveness. As such,
we are
	attempting to utilize GML geoRSS, however, we have needed to
extend the
	GML geoRSS with the ability identify time as well as space. 
	
	I wanted to just send out our approach to doing this to get
comments
	from anyone else who might be interested in this on the mailing
list.
	Simply put, we have added a GML TimePeriod to each of the geoRSS
nodes
	along with the spatial representation. Here is an example:
	
	<georss:where>
	    <gml:TimePeriod>
	           <gml:begin>2006-06-17T09:55:00Z</gml:begin>
	        <gml:end>2006-06-17T10:30:00Z</gml:end>
	    </gml:TimePeriod>
	    <gml:Point>
	        <gml:pos>37.65356495497155 -114.5048399056895</gml:pos>
	    </gml:Point>
	</georss:where>
	
	All comments would be appreciated.
	
	Regards,
	brian
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