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Re: [udig-devel] An update on WMS-C tiles and uDig
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Hi Graham, Emily,
thanks for the update, sounds all very interesting.
I'm not that much a WMS man, but I'm looking forward to try out the
tiled renderer.
Cheers,
Andrea
On Thu, Oct 23, 2008 at 12:03 AM, Graham Davis <gdavis@xxxxxxxxxxxxxxx> wrote:
> Hi,
>
> This is just an update on some of the functionality Emily G. and I have
> added to uDig trunk in the last few weeks. Some of this may be old news,
> but it is a quick run-down of the changes we've been making.
>
> WMS-C Tile servers are now supported in the catalog and there are some
> preferences you can set in regards to this. On the "WMS-C Tiles"
> preferences page you can set the maximum number of concurrent tile requests
> (ie: if this is set to 8 it will use a thread pool size of 8 and only send
> of a max of 8 tile requests at a time and wait before sending more), whether
> to use in-memory cache or on-disk cache, and you can also set where to cache
> tiles on disk or choose to clear the current cache.
>
> Additionally, there is an operation that allows you to right-click on any
> WMS-C Tile layer in the catalog view and choose to preload all the tiles for
> that layer and cache them on disk. This runs in a blocking dialog with a
> progress bar since the layer could potentially contain hundreds of thousands
> of tiles and doing so many continuous requests and disk writing can be
> resource heavy. These tile requests are sent off in groups (default is 16
> but this can be tweaked with the "max concurrent requests" preference
> mentioned above) and can take a while. Beware that the onslaught of so many
> continuous requests could potentially bog down the WMS-C server you are
> loading the tiles from.
>
> There is also a new tiled rendering system that can be used for rendering
> any data in uDig. This can be turned on in the "Rendering" preference page.
> It provides a cleaner flicker-free panning experience when viewing maps in
> uDig. Emily has mentioned this before via email, but there is also a new
> Scroll Pan Tool which works very well when tiled rendering is turned on.
> Emily has also cleaned up the rendering stack a lot, including removing
> some unnecessary render events.
>
> --
> Graham Davis
> Refractions Research Inc.
> gdavis@xxxxxxxxxxxxxxx
>
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
> http://lists.refractions.net/mailman/listinfo/udig-devel
>
