Hi,
I've created a vector-to-raster rendering transformation. I have the SLD
stored in GeoServer as a style and have added it as an available style to a
layer backed by a Shapefile datastore. How do I signify to the SLD to pass in
the feature collection from the datastore backing the layer as the feature
collection bound to the "flowline_features" input? I would prefer this method
(no SLD parameters on the WMS call) so that I can generate WMS output that can
be cached using the WMS-integrated GeoWebCache as the rendering may be
expensive. When I make calls to the layer with the style an empty feature
collection is passed (not null, but a FeatureColletion without any Features).
The WPS process accepts a SimpleFeatureCollection as the ComplexData Input
named "flowline_features". SLD below...
<?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>rt</Name>
<UserStyle>
<Title>rt</Title>
<Abstract>rt</Abstract>
<FeatureTypeStyle>
<Transformation>
<ogc:Function name="gs:FlowlineRaster">
<ogc:Function name="parameter">
<ogc:Literal>flowline_features</ogc:Literal>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>class_name</ogc:Literal>
<ogc:Literal>StreamOrde</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>
<RasterSymbolizer>
<!-- specify geometry attribute to pass validation -->
<Geometry><ogc:PropertyName>the_geom</ogc:PropertyName></Geometry>
<Opacity>1</Opacity>
<ChannelSelection>
<RedChannel>
<SourceChannelName>1</SourceChannelName>
</RedChannel>
<GreenChannel>
<SourceChannelName>1</SourceChannelName>
</GreenChannel>
<BlueChannel>
<SourceChannelName>1</SourceChannelName>
</BlueChannel>
</ChannelSelection>
</RasterSymbolizer>
</Rule>
</FeatureTypeStyle>
</UserStyle>
</NamedLayer>
</StyledLayerDescriptor>
Thanks much,
Tom Kunicki
Center for Integrated Data Analytics
U.S. Geological Survey
8505 Research Way
Middleton, WI 53562
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