While working with ImageMosaic stores, we noticed a possible regression in
the gs:Contour rendering transformation.
This regression appeared when we started working with GeoServer 2.8.2 and
seems to be also affecting version 2.9.0. Before that we were working with
GeoServer 2.7.1.1 and everything was fine.
These artefacts are visible when using the gs:Contour rendering
transformation directly from the SLD linked to the layer.
They also seem to be located on the upper left corner of generated tiles.
Here is a screenshot generated when using the gs:Contour directly from the
SLD (I added the black background to make the artefacts more visible) :
After more testing, it appears that removing the TextSymbolizer, used to
print the extracted levels, from the SLD.
Without the TextSymbolizer, the artefacts are no more visible !
And with even more testing, it appears that the problem is due to the Halo
option set for displaying the values of extracted contours. Also, it only
happens when the gs:Contour AND the TextSymbolizer (with Halo) are used at
the same time :
- with gs:Contour, with TextSymbolizer, without Halo : the rendering seems
to be fine.
- without gs:Contour (here I extracted manually the contours using gdal
and published a postgis layer), with TextSymbolizer, with Halo : then
rendering also seems to be fine
- with gs:Contour, without TextSymbolizer, with Halo : the bug
Hi Cyrill,
could you open a bug report at osgeo-org.atlassian.net/projects/GEOS with
data, style and wms request sufficient to reproduce the problem on someone
else computer?
And with even more testing, it appears that the problem is due to the Halo
option set for displaying the values of extracted contours. Also, it only
happens when the gs:Contour AND the TextSymbolizer (with Halo) are used at
the same time :
with gs:Contour, with TextSymbolizer, without Halo : the rendering seems
to be fine.
without gs:Contour (here I extracted manually the contours using gdal
and published a postgis layer), with TextSymbolizer, with Halo : then
rendering also seems to be fine
with gs:Contour, without TextSymbolizer, with Halo : the bug
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