[Tilecache] problem with transparency of cached tiles

[Bart van den Eijnden (OSGIS)]

I believe you need to add transparent=true to your url:

url=http://10.48.1.76:8080/geoserver/wms?transparent=true&

Best regards,
Bart

--
Bart van den Eijnden
OSGIS, Open Source GIS
http://www.osgis.nl


--------- Oorspronkelijk bericht --------
Van: David Herbert <darb1 at bas.ac.uk>
Naar: tilecache at openlayers.org <tilecache at openlayers.org>
Onderwerp: [Tilecache] problem with transparency of cached tiles
Datum: 30/07/07 11:22

> Hello,
> 
> I am having a few problems getting transparent PNG images to be output
> when using Tilecache 1.9rc3.  For example, I have a topography layer
> defined thus in tilecache.cfg:
> 
> [Topography]
> type=WMSLayer
> url=http://10.48.1.76:8080/geoserver/wms
> layers=sggis:contour_poly
> extension=png
> bbox=-82000,7800,80000,116000
> maxResolution=200.370370
> srs=EPSG:2007056
> 
> This results in a URL like e.g:
> 
>
http://10.48.1.76/tilecache/tilecache.cgi?LAYERS=Topography&amp;STYLES=sggis_contour&amp;FORMAT=image%2Fpng&amp;TRANSPARENT=true&amp;SERVICE=WMS&amp;VERSION=1.1.1&amp;REQUEST=GetMap&amp;EXCEPTIONS=application%2Fvnd.ogc.se_inimage&amp;SRS=EPSG%3A2007056&amp;BBOX=20589.62944%2C7800%2C71884.44416%2C59094.81472&amp;WIDTH=256&amp;HEIGHT=256
> 
> which appears to be calling the backend Geoserver WMS with
> TRANSPARENT=true.  However, the resulting image I get is NOT
> transparent.  Calling the backend Geoserver directly thus:
> 
>
http://10.48.1.76:8080/geoserver/wms/GetMap/?LAYERS=sggis%3Acontour_poly&amp;STYLES=sggis_contour&amp;FORMAT=image%2Fpng&amp;TRANSPARENT=true&amp;SERVICE=WMS&amp;VERSION=1.1.1&amp;REQUEST=GetMap&amp;EXCEPTIONS=application%2Fvnd.ogc.se_inimage&amp;SRS=EPSG%3A2007056&amp;BBOX=20589.62944%2C7800%2C71884.44416%2C59094.81472&amp;WIDTH=256&amp;HEIGHT=256
> 
> results in a transparent PNG as expected.  Is this a bug, or have I
> missed a vital parameter in tilecache.cfg?
> 
> Thanks for any help,
> 
> David Herbert
> British Antarctic Survey.
> 
> 
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