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Re: [udig-devel] An update on WMS-C tiles and uDig
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Hello Graham,
this is all great news! What servers have you guys tried out?
(TileCache? GeoServer/GeoWebCache? Are there others?)
Thanks,
Ugo
Graham Davis 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.
--
Ugo Taddei
Fraunhofer Institut Intelligente Analyse- und Informationssysteme (FhG IAIS)
http://www.iais.fraunhofer.de
Department Knowledge Discovery - IAIS.KD -
Working Group Spatial Decision Support
http://www.iais.fraunhofer.de/kd.html
phone (+49)2241-14-2184 fax (+49)2241-14-2072
Schloss Birlinghoven, D-53754 Sankt Augustin, Germany