FW: [OSGeo-Discuss] FOSS4G & Tile WMS

[Jason Birch]

See the below discussion about the development of a common tiling scheme.
 
I don't know if anyone from the MapGuide development community is involved with this, but it would be great if someone could participate so that MapGuide's internal tiling mechanism would be compatible with whatever comes out of this process.
 
Jason

________________________________

From: Chris Holmes [mailto:cholmes at openplans.org]
Sent: Sat 2006-08-19 5:34 PM
To: discuss at mail.osgeo.org
Cc: Justin Deoliveira; Schuyler Erle; tiling at lists.eogeo.org
Subject: Re: [OSGeo-Discuss] FOSS4G & Tile WMS



Note that the list in question is at:
http://lists.eogeo.org/mailman/listinfo/tiling

It would be great if we could get openlayers, ka-map, mapbuilder and
udig (and anyone else!) to all implement a common tiling scheme, and
then serve it up from geoserver, mapserver and mapguide.  Would be very
cool if we could generalize ka-map's caching code to be generic for any
WMS, able to crawl and cache a WMS, or to cache on the fly as clients
request.  We can use squid in front of geoserver or mapguide, but I
think there are some nice advantages to a dedicated caching piece - a
client could set it up to spare a server, and we could eventually link
to WFS-T to expire the cache when there's been an update in a certain area.

If we get a spec going I imagine we could pretty easily get it adopted
by OGC, in the same manner as GeoRSS.  We can certainly incubate at
osgeo/eogeo.

Chris

Steven M. Ottens wrote:
> Hi Jody, all
>
> I'm holding a technical session of 30min called 'Creating a high
> performance webmapping site
> <http://www.foss4g2006.org/contributionDisplay.py?contribId=127&confId=1>'
> (nr 127) where I will discuss the implementation of tiling in the edugis
> project, using mapbuilder, mapserver and apache's mod_cache. I hope this
> will be a starting point for a WMS-C/tiling discussion. I don't know of
> any other conferences about tiling, but I would be interested to visit them.
> I hope to visit the ka-map workshop who also has tiling. But I can
> imagine the ka-map people like to discuss ka-map and not wms-c/tiling.
> Also a discussion around beers is a very good idea ;).
> I haven't yet done a proper performance test with the new setup and I'm
> not too hopeful that I can manage that before lausanne, but we'll see.
>
> Regards,
> Steven
>
> ps. I accidently send the same mail from the wrong account, sorry if you
> receive it twice
>
> Jody Garnett wrote:
>> Shorter, Cameron wrote:
>>> Jody,
>>> With regards to tiling for the client, Steven Ottens is currently
>>> incorporating tiling into Mapbuilder and has been coordinating to some
>>> extent with OpenLayers and Kamap.  They have an email list set up -
>>> can't
>>> remember what it is off the top of my head.
>>>  
>> Indeed discussion about this email list, and the associated link was
>> the motivation for the idea. Their
>> wiki page seems to revole around questions not decisions.  Justin
>> wants an easy service to implement
>> for his GeoServer presentation, and setting up a uDig rendering
>> workflow to make use of it is dead
>> easy.  The interesting question is where to find the the description
>> of the tile breakdowns so requests
>> can be made in a manner that may be cached.
>>
>> So I would rather implement something; and then talk with code and a
>> profiler, rather then wade through
>> performance tradeoffs via email.  If Mr. Ottens has made some
>> decisions so much the better, if not we can
>> make some and compare notes & performance.
>>
>> I did think it may be fun to have something to talk shop over at
>> FOSS4G and Justin and I have managed to work
>> with the other projects mentioned (yet). It would be interesting to
>> see if building a standards in code is a good
>> way to start things off.
>>
>> Cheers,
>> Jody