GeoServer - WMS and WPS - Rendering Transformations - Point Clustering

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GeoServer - WMS and WPS - Rendering Transformations - Point Clustering Point Cluster: The Point Stacker rendering transformation is a Vector-to-Vector transformation which displays a data set of

1 GeoServer - WMS and WPS - Rendering Transformations - Point Clustering Point Cluster: The Point Stacker rendering transformation is a Vector-to-Vector transformation which displays a data set of points with nearby points aggregated together. Often, this produces a more readable map in situations when there are many close points displayed at once. The stacking is performed dynamically, so it can be used to visualize changing data. It provides good performance even when applied to very large datasets. The stacked view is created by configuring a layer with an SLD style which invokes the PointStacker rendering transformation. Let's take a dense point layer such as certified vernal pools: &styles=&bbox=-25257,736552,402626,995132&width=786&height=475&srs=epsg:26986&format=image/png Response: And let's group up the vernal pool into 1, 2-50 and > 50 clumps. Use 3 sizes of dots - bigger for each bigger group of points. Also label each dot with how many points it contains. Style name: GISDATA.CVP_PT::Clustered <?xml version="1.0" encoding="iso "?> <StyledLayerDescriptor version="1.0.0" xsi:schemalocation=" StyledLayerDescriptor.xsd" xmlns=" xmlns:ogc=" xmlns:xlink=" xmlns:xsi=" <NamedLayer>

2 <Name>vol_stacked_point</Name> <UserStyle> <Title>Stacked Point</Title> <FeatureTypeStyle> <Transformation> <ogc:function name="gs:pointstacker"> <ogc:literal>data</ogc:literal> <ogc:literal>cellsize</ogc:literal> <ogc:literal>30</ogc:literal> <ogc:literal>outputbbox</ogc:literal> <ogc:literal>wms_bbox</ogc:literal> <ogc:literal>outputwidth</ogc:literal> <ogc:literal>wms_width</ogc:literal> <ogc:literal>outputheight</ogc:literal> <ogc:literal>wms_height</ogc:literal> </Transformation> <Name>rule1</Name> <Title>1 Vernal Pool</Title> <ogc:propertyislessthanorequalto> <ogc:literal>1</ogc:literal> </ogc:propertyislessthanorequalto> <CssParameter name="fill">#ff0000</cssparameter> <Size>8</Size> <Name>rule2</Name> <Title>2-50 Vernal Pools</Title> <ogc:propertyisbetween>

3 <ogc:lowerboundary> <ogc:literal>2</ogc:literal> </ogc:lowerboundary> <ogc:upperboundary> <ogc:literal>50</ogc:literal> </ogc:upperboundary> </ogc:propertyisbetween> <Size>14</Size> <TextSymbolizer> <Label> </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> <Stroke> <CssParameter name="stroke">#ffffff</cssparameter> </Stroke> <Halo> <Radius>2</Radius> <CssParameter name="fill-opacity">0.9</cssparameter> </Halo> <CssParameter name="fill">#ffffff</cssparameter> <CssParameter name="fill-opacity">1.0</cssparameter> </TextSymbolizer> <Name>rule10</Name> <Title>More than 50 Vernal Pools</Title> <ogc:propertyisgreaterthan>

4 <ogc:literal>50</ogc:literal> </ogc:propertyisgreaterthan> <Size>22</Size> <TextSymbolizer> <Label> </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> <Stroke> <CssParameter name="stroke">#ffffff</cssparameter> </Stroke> <Halo> <Radius>2</Radius> <CssParameter name="fill-opacity">0.9</cssparameter> </Halo> <CssParameter name="fill">#ffffff</cssparameter> <CssParameter name="fill-opacity">1.0</cssparameter> </TextSymbolizer> </FeatureTypeStyle>

5 </UserStyle> </NamedLayer> </StyledLayerDescriptor> Request: &styles=gisdata.cvp_pt::clustered&bbox=-25257,736552,402626,995132&width=786&height=475&srs=epsg:26986&format=image/p ng Response: Rendering transformations can also be chained.

AiM 8.0 Quick Reference Guide Styled Layer Descriptor (SLD)

AiM 8.0 Quick Reference Guide 2015 AssetWorks LLC 1777 NE Loop 410, Suite 1250 San Antonio, Texas 78217 (800) 268-0325 TABLE OF CONTENTS INTRODUCTION... 3 SLD... 4 MODIFYING THE.SLD FILE... 4.SLD FILE