[Geoserver-users] SLD grouping labels on a polygon

Pedro_Mendes · June 3, 2008, 1:26pm

Im having some issues getting the label of a polygon in the expected place,
the centroid.

wheres one of my slds rules
...

      <TextSymbolizer>
        <Label>
          <ogc:PropertyName>CODE</ogc:PropertyName>
        </Label>

          <CssParameter name="font-family">Arial</CssParameter>
          <CssParameter name="font-style">Normal</CssParameter>
          <CssParameter name="font-size">16</CssParameter>

        <Halo>
          <Radius>
            <ogc:Literal>2</ogc:Literal>
          </Radius>
          <Fill>
            <CssParameter name="fill">#FFFFFF</CssParameter>
            <CssParameter name="fill-opacity">0.85</CssParameter>
          </Fill>
        </Halo>
        <Fill>
          <CssParameter name="fill">#FFa850</CssParameter>
        </Fill>

      </TextSymbolizer>
...

with this i´m getting the label repeated all over the polygon.
also tried <VendorOption name="group">yes</VendorOption> or <VendorOption
name="group">true</VendorOption> at the end of <TextSymbolizer> but with no
results.

The funny thing is that if i put a pointsymbolizer, it is appearing in the
centroid of the polygon..

Can someone help?

Thanks in advance.

Pedro Mendes
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Michael_Melvin · June 3, 2008, 4:38pm

Hi Pedro. I've had luck with the spaceAround parameter in the past, which might be helpful in this case.

From digging around online, I found also this resource over at MassGIS:
http://lyceum.massgis.state.ma.us/wiki/doku.php?id=wms:sld:graphics_with_labels_inside

Hope this helps. Please let us know what you do to resolve your issue, as this tends to be a commonly asked question.

Thanks,
Mike Pumphrey
Outreach Engineer
The Open Planning Project

Pedro Mendes wrote:

Im having some issues getting the label of a polygon in the expected place,
the centroid.

wheres one of my slds rules
...

      <PolygonSymbolizer>
        <Fill>
          <CssParameter name="fill">#d1d1d1 </CssParameter>
          <CssParameter name="fill-opacity">0.5</CssParameter>
        </Fill>
        <Stroke>
          <CssParameter name="stroke">#FFa850</CssParameter>
          <CssParameter name="stroke-width">1.5</CssParameter>
        </Stroke>
      </PolygonSymbolizer>

      <TextSymbolizer>
        <Label>
          <ogc:PropertyName>CODE</ogc:PropertyName>
        </Label>

          <CssParameter name="font-family">Arial</CssParameter>
          <CssParameter name="font-style">Normal</CssParameter>
          <CssParameter name="font-size">16</CssParameter>

        <Halo> <Radius>
            <ogc:Literal>2</ogc:Literal>
          </Radius>
          <Fill>
            <CssParameter name="fill">#FFFFFF</CssParameter>
            <CssParameter name="fill-opacity">0.85</CssParameter> </Fill>
        </Halo>
        <Fill>
          <CssParameter name="fill">#FFa850</CssParameter>
        </Fill>

      </TextSymbolizer>
...

with this i´m getting the label repeated all over the polygon.
also tried <VendorOption name="group">yes</VendorOption> or <VendorOption
name="group">true</VendorOption> at the end of <TextSymbolizer> but with no
results.

The funny thing is that if i put a pointsymbolizer, it is appearing in the
centroid of the polygon..

Can someone help?

Thanks in advance.

Pedro Mendes

Andrea_Aime3 · June 4, 2008, 12:22pm

Pedro Mendes ha scritto:
...

with this i´m getting the label repeated all over the polygon.
also tried <VendorOption name="group">yes</VendorOption> or <VendorOption
name="group">true</VendorOption> at the end of <TextSymbolizer> but with no
results.

The funny thing is that if i put a pointsymbolizer, it is appearing in the
centroid of the polygon..

Can someone help?

Hum, are you using tiled rendering? GeoServer does not put multiple labels per polygon usually, there are two exceptions:
* multipolygons, each one of the polygons in a multipolygon gets
   labelled
* tiled rendering on the client side. If the polygon spans multiple
   tiles, each tile may have its own label. This is because each tile
   is a separate request, and GeoServer labels the portion of the
   polygon that falls into it.
   In this case you should look into metatiling, either by using
   the GeoServer built it mechanism
   (http://geoserver.org/display/GEOSDOC/WMS+vendor+parameters, see
   "on the fly meta tiler") or by using a tile cache such as GeoWebCache
   (that can be used as GeoServer plugin as well) or TileCache.

Cheers
Andrea

Pedro_Mendes2 · December 12, 2008, 12:28pm

Sorry for late reply...

Yes, i´m using tiled rendering with TileCache. Geometries are multipolygons.
I did some tests requesting tiles with OpenLayers and the output was the
expected, meaning no duplicate labels.

Metatiling is set to true and metasize to 5. I regenerated cache for the
testing bounding box and the output was the expected.

p.s.: Must refer this about MetaTiling: i'm experiecing some failed
requested tiles when the metasize value is diferent of 1,1..

Thanks list, aaime

Cumps,Pedro

aaime wrote:

Pedro Mendes ha scritto:
...

with this i´m getting the label repeated all over the polygon.
also tried <VendorOption name="group">yes</VendorOption> or <VendorOption
name="group">true</VendorOption> at the end of <TextSymbolizer> but with
no
results.

The funny thing is that if i put a pointsymbolizer, it is appearing in
the
centroid of the polygon..

Can someone help?

Hum, are you using tiled rendering? GeoServer does not put multiple
labels per polygon usually, there are two exceptions:
* multipolygons, each one of the polygons in a multipolygon gets
   labelled
* tiled rendering on the client side. If the polygon spans multiple
   tiles, each tile may have its own label. This is because each tile
   is a separate request, and GeoServer labels the portion of the
   polygon that falls into it.
   In this case you should look into metatiling, either by using
   the GeoServer built it mechanism
   (http://geoserver.org/display/GEOSDOC/WMS+vendor+parameters, see
   "on the fly meta tiler") or by using a tile cache such as GeoWebCache
   (that can be used as GeoServer plugin as well) or TileCache.

Cheers
Andrea

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