Hi Andrea
Thanks for the feedback.
I will try to put together a sample of the data showing the problem. This may
take a while as there are copyright issues with the raster files.
The raster dataset itself is a set of digital raster maps that are typically
used in the scale range 1:10000 to 1:50000. It is not aerial photography or
satellite imagery and instead shows cartographic lines, text etc. This may be
the reason that the difference in image quality is apparent.
I will come back to you as soon as I've got permission to forward on a sample
to you.
Regards
Donnacha
------------------------
Donnacha Nelan, Software Architect,
1Spatial Ireland
Registered Office: 1 Nore House, Riverview Business Park, Mahon, Cork, Ireland
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[email protected]<mailto:[email protected]>
________________________________
From: [email protected] [[email protected]] On Behalf Of Andrea Aime
[[email protected]]
Sent: 05 July 2011 21:16
To: Donnacha Nelan
Cc: [email protected]
Subject: Re: [Geoserver-users] Raster quality downgrade in LayerGroup
On Tue, Jul 5, 2011 at 10:15 AM, Donnacha Nelan
<[email protected]<mailto:[email protected]>> wrote:
Hi list,
I have encountered a problem with a difference in the quality of display of a
raster depending on whether the layer is in a LayerGroup or not.
On its own, i.e. not in a layer group, the image displayed is of good quality
with nice smooth text, lines etc.
In the LayerGroup the image is of bad quality with text and lines ‘chunky’.
I have set the interpolation method for the layer and for the wms service to be
‘bicubic’
It is as if the interpolation method is not being used when the layer is in a
LayerGroup. Is this possible? Is there a way of setting the interpolation
method for a LayerGroup raster layer?
Starting with GeoServer 2.1.1 the code path to ask for a raster layer stand
alone, and ask for a group of layers have been
completely separated.
This has been done for performance and scalability concerns, when a single
raster is asked GeoServer can work in "image server" mode
instead of "map server" mode, the former is definitely faster.
I guess we made improvements to the image server mode that were not ported back
to the classic map server mode.
Do you have an example data set with styles that we can use to reproduce the
issue?
By your description it seems the raster is not the typical aerial/satellite
imagery, nor scientific data, but sounds more like
a scanned map?
Cheers
Andrea
--
-------------------------------------------------------
Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 962313
http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
http://www.youtube.com/user/GeoSolutionsIT
http://www.linkedin.com/in/andreaaime
http://twitter.com/geowolf
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