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

[Jesse Eichar]

On 4-Feb-07, at 9:41 AM, Chris Holmes wrote:

>
>> 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

Currently uDig has no tiling what so ever.  I'd love to see it in the  
future as well it makes for a nice user experience.  Jody has done  
some work to make up a framework that can be leveraged by uDig.

Jesse