Hi!
I am rendering some point data using the PointStacker transformation and then
styled as a circle - it's pretty much a straight copy of the example in the
docs... 3 rules in my style - 1 point, 2-50 points and more than 50 points.
If I overlay the data using the plain "point" style, then I notice that the
"clustered" style actually displays the data offset from the original point if
I have a cell size of anything other than 1. Even for single point clusters.
The larger the cell size, the more they are offset.
Is there any way that I can get the clustered markers to display on the
original point - or for multi-points probably on something like the "middle" of
the points.
I've tried using the "preserveLocation" parameter but it doesn't seem to have
any effect.
I also tried applying an "offset" geometry filter to the PointSymbolizer but
that didn't seem to do much either.
My style looks a little like....
<?xml version="1.0" encoding="ISO-8859-1"?>
<StyledLayerDescriptor ...>
<NamedLayer>
...
<UserStyle>
...
<FeatureTypeStyle>
<Transformation>
<ogc:Function name="gs:PointStacker">
<ogc:Function name="parameter">
<ogc:Literal>data</ogc:Literal>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>cellSize</ogc:Literal>
<ogc:Literal>20</ogc:Literal>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>preserveLocation</ogc:Literal>
<ogc:Literal>Single</ogc:Literal>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>outputBBOX</ogc:Literal>
<ogc:Function name="env">
<ogc:Literal>wms_bbox</ogc:Literal>
</ogc:Function>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>outputWidth</ogc:Literal>
<ogc:Function name="env">
<ogc:Literal>wms_width</ogc:Literal>
</ogc:Function>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>outputHeight</ogc:Literal>
<ogc:Function name="env">
<ogc:Literal>wms_height</ogc:Literal>
</ogc:Function>
</ogc:Function>
</ogc:Function>
</Transformation>
<Rule>
<Name>rule1</Name>
<Title>1 Hotspot</Title>
<ogc:Filter>
<ogc:PropertyIsLessThanOrEqualTo>
<ogc:PropertyName>count</ogc:PropertyName>
<ogc:Literal>1</ogc:Literal>
</ogc:PropertyIsLessThanOrEqualTo>
</ogc:Filter>
<PointSymbolizer>
<Graphic>
<Mark>
<WellKnownName>circle</WellKnownName>
<Fill>
<CssParameter name="fill">#FFFFFF</CssParameter>
</Fill>
</Mark>
<Size>8</Size>
</Graphic>
</PointSymbolizer>
</Rule>
...
</FeatureTypeStyle>
</UserStyle>
</NamedLayer>
</StyledLayerDescriptor>
Any help much appreciated.
Simon Oldfield
National Earth Observation Group | Environmental Geoscience Division |
GEOSCIENCE AUSTRALIA
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