Re: [udig-devel] Udig and WMS tiles

[Joaquín Rodriguez-Guerra Urcelay <jrguerra@xxxxxxx>]

Thank you Jody, nice post.
I took the first option which fits my needs (mapserver+tilecache)  and it works fine :)
Option two would be a nice feature to have, but I see it to complex for me :s

Thanks!
Regards,
Joaquín
________________________________________
De: udig-devel-bounces@xxxxxxxxxxxxxxxxxxxxx [udig-devel-bounces@xxxxxxxxxxxxxxxxxxxxx] En nombre de Jody Garnett [jody.garnett@xxxxxxxxx]
Enviado el: miércoles, 22 de junio de 2011 10:46
Para: User-friendly Desktop Internet GIS
Asunto: Re: [udig-devel] Udig and WMS tiles

There are kind of two answers here:

- There are tiled map servers we can use to fetch tiles; the tile servers that speak the "WMS-C" protocol are really just normal WMS servers that indicate what tile size and zoom levels to use for access - and ask that each client makes requests in exactly the same way for performance reasons. This system is nice in that you can configure it to store tiles on disk for a much faster experience next time you run.

If you install geowebcache or tilecache it will make use of this technique (you do not even need to configure geowebcache to "cache" - it is more that it tells uDig how you want it to ask for tiles in a consistent fashion).

- We could make some modifications to the uDig support for "tile servers" so that you can fill in this information and treat a normal WMS as if it was producing tiles.  It would involve some configuration as we would need to supply the tile sonze and zoom levels - but the result would support a local tile cache and rescaling - at some loss of quality when the zoom level does not match up exactly. If you are interested in this work we could start a conversation on the udig-devel list.

- The Tiled Rendering system is an experiment started by Refractions and not really completed to my satisfaction (it crashes ever time on mac for example). It uses the normal uDig renderer to draw into a series of tiles which it holds in memory allowing for faster scrolling in an interactive mapping application such as tracking a moving car.




--
Jody Garnett


On Wednesday, 22 June 2011 at 6:10 PM, Joaquín Rodriguez-Guerra Urcelay wrote:

Hello,

I was wondering if I could improve performance by using tiles when displaying wms layers in uDig, so I have started looking, but I am a bit lost... :s
I dont really know how to start, first I have seen that there is an option "Use Tiled Rendering System" under the Rendering tab in the Preferences page, but I dont see any difference when loading wms layers, the image comes to my screen straigh forward in one piece.
The second test, adding layers from the wms-c sample servers in the web catalog, went better. I can see like layers are loaded in tiles progressively, which is what I want.
So now... Is there a way to use tiles when connecting to a normal wms server?? if not, to have a wms-c server I should install something like geowebcache or tilecache to point to my mapserver, right?

Thank you!
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