[Geotools-devel] [udig-devel] Testing for RC9 (plus image pyramid plans)

[Chris Holmes]

> 
> However, it seems like Simone can lead us to bigger and better things.
> Simone, when uDig eventually integrates your work, will it be possible
> to make a set of structured requests of the WMS to build a temporary
> image pyramid to improve user responsiveness. A user has at most
> 2000x2000 pixels on their screen. The base request should be for
> whatever area of interest (extent and scale) the map has when the user
> adds the layer to the map (or makes it visible). However, once that
> request is fulfilled, couldn't uDig start building an image pyramid on
> the fly so that whatever the user does next (pan, zoom) uDig would have
> the data. We can see immediately that there are a whole slew of issues
> that arise in designing such a background pyramid building. Is this
> something some of you have been pondering? 

In my opinion the best way to do this would be to follow the WMS Client 
recommendation: 
http://wiki.osgeo.org/index.php/WMS_Tiling_Client_Recommendation

This is what openlayers uses, so we'd benefit from the caching of 
servers that openlayers is hitting.  They pre-request a buffer, but not 
the next zoom level.  uDig could also easily cache and pre-cache in this 
way.

Chris


> 
> 
> Thanks again for all the work on RC9,
> --adrian
> 
> 
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-- 
Chris Holmes
The Open Planning Project
http://topp.openplans.org
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