Hi List,
I have been trying to use the new heatmap transformation in version 2.2.3 but I
think I must be doing something wrong.
I wish to display a layer defined using an SQL view. The query simply returns a
Grid of points and for each point there is a temperature value, I am using the
round function in the query to round the temperature value to the nearest
integer.
I am using the SLD below, copied from the example and modified to (hopefully)
work with my data. However, the entire map is produced in one colour (#FFFF00)
but when I query the map by clicking on it in an Openlayers preview it shows
correct values for the Temperatures and different locations on the map yield
different values.
Any ideas?
<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>Heatmap</Name>
<UserStyle>
<Title>Heatmap</Title>
<Abstract>A heatmap showing upper air temperature</Abstract>
<FeatureTypeStyle>
<Transformation>
<ogc:Function name="gs:Heatmap">
<ogc:Function name="parameter">
<ogc:Literal>data</ogc:Literal>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>weightAttr</ogc:Literal>
<ogc:Literal>temperature</ogc:Literal>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>radiusPixels</ogc:Literal>
<ogc:Function name="env">
<ogc:Literal>radius</ogc:Literal>
<ogc:Literal>100</ogc:Literal>
</ogc:Function>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>pixelsPerCell</ogc:Literal>
<ogc:Literal>10</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>location</ogc:PropertyName>
</Geometry>
<Opacity>0.6</Opacity>
<ColorMap type="ramp">
<ColorMapEntry color="#0047B2" quantity="-70" label="nodata"
opacity="0" />
<ColorMapEntry color="#005CE6" quantity="-60" label="-60" />
<ColorMapEntry color="#1975FF" quantity="-50" label="-50" />
<ColorMapEntry color="#4D94FF" quantity="-40" label="-40" />
<ColorMapEntry color="#80B2FF" quantity="-30" label="-30" />
<ColorMapEntry color="#B2D1FF" quantity="-20" label="-20" />
<ColorMapEntry color="#CCE0FF" quantity="-10" label="-10" />
<ColorMapEntry color="#FFFF00" quantity="0" label="0"/>
<ColorMapEntry color="#FFCCB2" quantity="5" label="+5" />
<ColorMapEntry color="#FFCCB2" quantity="10" label="+10" />
<ColorMapEntry color="#FFB894" quantity="20" label="nodata"
opacity="0"/>
</ColorMap>
</RasterSymbolizer>
</Rule>
</FeatureTypeStyle>
</UserStyle>
</NamedLayer>
</StyledLayerDescriptor>
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