Hi Mauro!
I've been involved in other issues but now I'm come back on this one.
Searching on the web I've found that probably there is a bug on GeoServer
about this functionality (ref: https://jira.codehaus.org/browse/GEOS-5228.
See also discussion
http://comments.gmane.org/gmane.comp.gis.geoserver.user/39166), and this
is a point, bad point but a point.
https://jira.codehaus.org/browse/GEOS-5228. See also discussion
http://comments.gmane.org/gmane.comp.gis.geoserver.user/39166.
So I'm started form your suggestion and now I've found a little workaround
that seems working quite fine using a single SLD and avoiding to use a
GroupLayer too.
Here you are my new SLD
<?xml version="1.0" encoding="ISO-8859-1"?>
<StyledLayerDescriptor version="1.0.0"
xsi:schemaLocation="http://www.opengis.net/sld StyledLayerDescriptor.xsd"
xmlns="http://www.opengis.net/sld";
xmlns:ogc="http://www.opengis.net/ogc";
xmlns:xlink="http://www.w3.org/1999/xlink";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
<NamedLayer>
<Name>Cluster points</Name>
<UserStyle>
<!-- Styles can have names, titles and abstracts -->
<Title>Cluster points</Title>
<Abstract>Styling using cluster points server side</Abstract>
<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>30</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>Singoli punti</Title>
<MinScaleDenominator>2000</MinScaleDenominator>
<PointSymbolizer>
<Graphic>
<Mark>
<WellKnownName>circle</WellKnownName>
<Fill>
<CssParameter name="fill">#ff0000</CssParameter>
</Fill>
</Mark>
<Size>6</Size>
</Graphic>
</PointSymbolizer>
</Rule>
<Rule>
<Name>ruleGT1</Name>
<Title>Cluster</Title>
<ogc:Filter>
<ogc:PropertyIsGreaterThan>
<ogc:PropertyName>count</ogc:PropertyName>
<ogc:Literal>1</ogc:Literal>
</ogc:PropertyIsGreaterThan>
</ogc:Filter>
<MaxScaleDenominator>10000000</MaxScaleDenominator>
<PointSymbolizer>
<Graphic>
<Mark>
<WellKnownName>circle</WellKnownName>
<Fill>
<CssParameter name="fill">#ff0000</CssParameter>
</Fill>
</Mark>
<Size>22</Size>
</Graphic>
</PointSymbolizer>
<TextSymbolizer>
<Label>
<ogc:PropertyName>count</ogc:PropertyName>
</Label>
<Font>
<CssParameter name="font-family">Arial</CssParameter>
<CssParameter name="font-size">12</CssParameter>
<CssParameter name="font-weight">bold</CssParameter>
</Font>
<LabelPlacement>
<PointPlacement>
<AnchorPoint>
<AnchorPointX>0.5</AnchorPointX>
<AnchorPointY>0.8</AnchorPointY>
</AnchorPoint>
</PointPlacement>
</LabelPlacement>
<Halo>
<Radius>2</Radius>
<Fill>
<CssParameter name="fill">#ff0000</CssParameter>
<CssParameter name="fill-opacity">0.9</CssParameter>
</Fill>
</Halo>
<Fill>
<CssParameter name="fill">#FFFFFF</CssParameter>
<CssParameter name="fill-opacity">1.0</CssParameter>
</Fill>
</TextSymbolizer>
</Rule>
</FeatureTypeStyle>
</UserStyle>
</NamedLayer>
</StyledLayerDescriptor>
I've tried to use it using GeoExplorer and also using QGIS as WMS service
client and it's working.
NOTE: in this manner, I don't know why, I can also identify point cluster
too.... :-)
Thanks for the suggestions and I hope this could be useful for others!!
Bye
Cesare
Cesare Gerbino
http://cesaregerbino.wordpress.com/
http://www.facebook.com/cesare.gerbino
http://www.facebook.com/pages/Cesare-Gerbino-GIS-Blog/246234455498174?ref=hl
https://twitter.com/CesareGerbino
http://www.linkedin.com/pub/cesare-gerbino/56/494/77b
2014-06-03 9:04 GMT+02:00 Mauro Bartolomeoli <
mauro.bartolome...@geo-solutions.it>:
> Hi Cesare,
> I think the problem is that rendering transformations are not correctly
> supported, currently, in GetFeatureInfo.
> Your SLD is correct, but is referring a property (count) that is in the
> transformed feature (PointStacker) but not in your original one, while the
> GetFeatureInfo code tries to apply the filter to your original feature and
> so it fails.
> Maybe you could try using a layergroup where the pointstacker is used only
> until a certain scale, and then the original layer is used for lower scales.
>
> Mauro Bartolomeoli
>
>
> 2014-05-31 17:57 GMT+02:00 cesare gerbino <cesaregerb...@gmail.com>:
>
>> I'm a newbie to use GeoServer and SLDs so, sorry in advance if my
>> question is stupid.
>>
>> I'm trying to use the Point Stacker rendering transfomation for to
>> cluster my point layer. I've a POSTGIS point layer with more than 514.000
>> points (all the OSM addresses in Italy ....), and so I can't to render them
>> with a simple "red point" in my map and I can't render them using a
>> clustering in the browser using Leaflet, OpenLayers, ecc ...
>>
>> The structure of my POSTGIS layer is the following
>> field_1 BigDecimal true 0/1 field_2 BigDecimal true 0/1 field_3
>> BigDecimal true 0/1 field_4 String true 0/1 geom Point true 0/1
>>
>> The field I'm interested on is "field_4"
>>
>> If I try to use a default point symbol to render my layer the
>> visualization is obviously slow but it works right and I can also to
>> identify my point.
>>
>> I've tried to use the SLD that I've found here
>> http://suite.opengeo.org/opengeo-docs/cartography/rt/pointstacker.html
>> for clustering server side and it's working for mapping my layer as
>> clustered points.
>>
>> I shoud add more classes in my SLD style and I'll do it, but at the
>> moment the issue is that, using cluster, I can't identify points, not when
>> they'are clustered (I don't want this ....), but when they are rappresented
>> as single point.
>>
>> The error is "internal error occurred Property 'count' could not be found
>> in osm_civici": I haven't that field in my layer but I've seen that is a
>> "field" used in the SLD style ....
>>
>> NOTE: I'm using the SLD style found in OpenGeo Suite documentation at
>> http://suite.opengeo.org/opengeo-docs/cartography/rt/pointstacker.html
>> "as-is" and probably there is something to change but I don't know what
>> ....
>>
>> I'm using OpenGeoSuite Version 4.0.2 on Windows 7 (GeoServer 2.4-SNAPSHOT
>> Git Revision f295d37d70c3b1f0e51942e8b031253e4d75459 Build Date 20-Jan-2014
>> 22:29)
>>
>> Thank you very much in advance!
>> Cesare Gerbino
>>
>> http://cesaregerbino.wordpress.com/
>> http://www.facebook.com/cesare.gerbino
>>
>> http://www.facebook.com/pages/Cesare-Gerbino-GIS-Blog/246234455498174?ref=hl
>> https://twitter.com/CesareGerbino
>> http://www.linkedin.com/pub/cesare-gerbino/56/494/77b
>>
>>
>>
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>>
>
>
> --
> ==
> Meet us at GEO Business 2014! in London! Visit http://goo.gl/fES3aK
> for more information.
> ==
>
> Dott. Mauro Bartolomeoli
> @mauro_bart
> Senior Software Engineer
>
> GeoSolutions S.A.S.
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
> Italy
> phone: +39 0584 962313
> fax: +39 0584 1660272
>
> http://www.geo-solutions.it
> http://twitter.com/geosolutions_it
>
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