GeoServer – Refer to Other SLD for GetLegendGraphic

geoservergetlegendgraphicsldwms

I have a group layer in geoserver with all layers having one style each.

However, for the legend I want to refer to an "external" SLD (basically a simplified "dummy legend"). The SLD is in the same workspace as the group layer and I guess you can specify the SLD you want to get by GetLegendGraphic Parameters? Here specifically, I'm thinking of the SLD parameter.

The solution (I think) is something like this:

https://wms.myserver.com/geoserver/my_workspace/wms?REQUEST=GetLegendGraphic&VERSION=1.0.0&FORMAT=image/png&WIDTH=30&HEIGHT=30&LAYER=my_group_layer&SLD=**???**

In the SLD documentation it says thatt you can refer to an external SLD by a URL. How do i know what URL to use as a parameter?

Best Answer

If your style is already published by GeoServer then you can just use the style parameter in the GetLegend request:

http://localhost:8080/geoserver/ows?service=WMS&request=GetLegendGraphic&format=image%2Fpng&width=20&height=20&layer=topp%3Astates&style=pophatch

If you need to send specific SLD then the process is the same as sending it for a layer as discussed in this question and the manual

Related Solutions

[GIS] GeoServer GetLegendGraphic request ServiceException

I found out that my geometry column had a not-null constraint in PostGIS. When I removed the not-null constraint I got rid of the GetLegendGraphic request ServiceException.

Another solution to get rid of the GetLegendGraphic request ServiceException was to change the geometrytype in PostGIS from GEOMETRY TO LINESTRING (change the type in the table geometry_columns), but that is not a valid option in my case.

[GIS] GetLegendGraphic request string is too long

You could post the sld to a php-file which writes a sld-file on the server(considering some security aspects). Then you could point to this file:

Example: 4 times the same layer, getlegendgraphic with 4 different sld's:

http://suite.opengeo.org/geoserver/wms?TRANSPARENT=true&VERSION=1.1.1&SERVICE=WMS&REQUEST=GetLegendGraphic&SLD=https://raw.githubusercontent.com/boundlessgeo/suite-data/master/default/styles/states.sld&EXCEPTIONS=application/vnd.ogc.se_xml&LAYER=usa:states&FORMAT=image/png&width=150&height=50

http://suite.opengeo.org/geoserver/wms?TRANSPARENT=true&VERSION=1.1.1&SERVICE=WMS&REQUEST=GetLegendGraphic&SLD=https://raw.githubusercontent.com/ROGUE-JCTD/COPECO-Layers/master/Layers/edificios/polygon.sld&EXCEPTIONS=application/vnd.ogc.se_xml&LAYER=usa:states&FORMAT=image/png&width=150&height=50

http://suite.opengeo.org/geoserver/wms?TRANSPARENT=true&VERSION=1.1.1&SERVICE=WMS&REQUEST=GetLegendGraphic&SLD=https://raw.githubusercontent.com/opengeogroep/NLExtract/master/top10nl/style/sld/jw_van_aalst/Top10NL-Gebouw_vlak_(kas).sld&EXCEPTIONS=application/vnd.ogc.se_xml&LAYER=usa:states&FORMAT=image/png&width=150&height=50

http://suite.opengeo.org/geoserver/wms?TRANSPARENT=true&VERSION=1.1.1&SERVICE=WMS&REQUEST=GetLegendGraphic&SLD=https://gist.githubusercontent.com/dwins/425748/raw/67e7c243b23a20f9bc78cb1b26b30834a6925b52/planet_polygon.sld.xml&EXCEPTIONS=application/vnd.ogc.se_xml&LAYER=usa:states&FORMAT=image/png&width=150&height=50

Or as user stuporglue mentioned you could use geoservers rest interface but there you would have to consider how to erase unused styles again: http://docs.geoserver.org/stable/en/user/rest/examples/curl.html