[OpenLayers-Dev] OL not suitable for raster layers?

Stefanie Weykam stefanie at weykam.net
Thu Apr 15 05:04:25 EDT 2010

Thanks for your quick response, Bart.
I am not sure if I understand your questions right. The WMS product we 
are using is version 1.1.1 (generated by MapServer).
Both layers are served under the following URL:
As for you question nº1 - if you refer to the display - yes, the results 
are different (testing with DEMIS world map and our layers). If you 
refer to the request string - I haven't payed much attention to the 
strings but anyway, here are the strings from gvSIG:

You may also wish to see the complete geoportal web page:
Here, tiling of the raster layers is currently default (singleTile false).
Viewing the test code I send a couple of weeks ago you can see both, 
tiled and untiled.
The place tested with gvSIG is actually further east but provided us 
with pixels more suitable to query and compare.

Let me know if you need more details.

bartvde at osgis.nl escribió:
> Hi Stefanie,
> I am trying your test page from March, but I can't really see what's
> wrong, probably because I don't know your dataset well.
> A few questions:
> 1) have you compared the URLs from gvSIG with OpenLayers singleTile requests?
> 2) which WMS product are you using?
> Can you provide me with 2 urls, one from gvSIG which is correct, and one
> generated by OpenLayers (singleTile) which is supposed to be wrong.
> TIA.
> Best regards,
> Bart
>> Hi all,
>> This might be the wrong moment and everybody seems to be busy with the
>> new release candidate. But we need to come to a conclusion whether OL
>> suits our needs or not…
>> I posted several messages (on 26.3. and 8.4.) reporting a layer
>> displacement which seem to effect raster layers only. The pixel size of
>> our raster maps is big and the displacement is obvious.
>> Tests with another client software show that the maps are correctly
>> displayed, so this must be a matter of OL.
>> GetFeatureInfo is not effected (values of the expected pixel are
>> returned although the visible pixel is not the right one).
>> Configuring the layer as tiled or untiled (singleTile false or true)
>> does have an effect: none of them is in the right place but both results
>> show different displacements.
>> More information and test code in my message posted on 26.3.
>> Regards and thanks for your opinions,
>> Stefanie
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