Is there a way to set the attribute name dynamically via sld substitution in Geoserver?

Question

In Geoserver, a have a SLD style with a rule that looks like this

    <Rule>
        <ogc:Filter>
            <ogc:PropertyIsGreaterThan>
                <ogc:Function name="env">
                  <ogc:PropertyName>
                      property
                  </ogc:PropertyName>
                </ogc:Function>

                <ogc:Function name="env">
                  <ogc:Literal>value1</ogc:Literal>
                  <ogc:Literal>0</ogc:Literal>
                </ogc:Function>

            </ogc:PropertyIsGreaterThan>
        </ogc:Filter>
        <PolygonSymbolizer>
            <Fill>
                <CssParameter name="fill">
                    #ff0000
                </CssParameter>
                <CssParameter name="fill-opacity">
                    0.5
                </CssParameter>
            </Fill>
        </PolygonSymbolizer>
    </Rule>

In the WMS request, i send an env parameter, specifing the property and the value1 parameters for dynamic sld substitution. The property parameter gets a value of an attribute name that exists on the layer I want to display the style with.

My solution won't work. I get an exception, saying:

The requested style cannot be used with this layer. The style specifies an attribute property and the layer is: ...

Is there a way to set the attribute name dynamically via sld substitution in Geoserver? And if yes, how can I achive that?

I am using Geoserver 2.7.2

Btw. this works:

            <ogc:PropertyIsGreaterThan>

                  <ogc:PropertyName>
                      Einwohner
                  </ogc:PropertyName>


                <ogc:Function name="env">
                  <ogc:Literal>value1</ogc:Literal>
                  <ogc:Literal>0</ogc:Literal>
                </ogc:Function>

            </ogc:PropertyIsGreaterThan>

does <ogc:PropertyName><ogc:Function name="env"> property </ogc:Function></ogc:PropertyName> work? — Ian Turton, Commented Aug 31, 2015 at 15:58
Unfortunatly not, this would give a validation error: cvc-complex-type.2.4.d: Invalid content was found starting with element 'ogc:Function'. No child element is expected at this point. — hnrch, Commented Sep 1, 2015 at 6:42
I am starting thinking about creating a string for SLD_BODY on the fly, although I find it to be a little hacky. Should also be less perfomant, I guess. — hnrch, Commented Sep 1, 2015 at 6:46
No, it does not. The error is gone, the layer gets rendered, but the filter is not working as expected. In fact, no matter what value value1 is, the filter now always includes all objects of the layer. — hnrch, Commented Sep 1, 2015 at 15:32

Andre Silva · Accepted Answer · 2016-03-14 13:26:49Z

I could not work this out. The feature of dynamically setting property names via env variables seems not to be supported at this moment.

I ended up with a different solution now (using the Geoserver REST API for styles) and I am quite happy with it.

Here is what I did: based on what the user enters on the GUI, I manually wrote sld (as a complete string). Then, I uploaded this string to the style REST endpoint of Geoserver, setting the correct content-header, as described here: http://docs.geoserver.org/2.7.1/user/rest/api/styles.html

Every style is getting a unique identifier. Before uploading a style, I try to download it via GET to see if it exists. If I get a 404, I do a POST to upload a new style. Otherwise, I upload my string with a PUT to modify the existing style. Once a style has been uploaded, I use the style Id in WMS GetMap requests.

fatih · Accepted Answer · 2015-10-07 08:22:25Z

1

degisken1 GIS_ID

answered Oct 7, 2015 at 8:22

fatih

371 bronze badge

4

Welcome to GIS SE! As a new user be sure to take the Tour. Please always include code as text rather than pictures in your answers (and questions) so that it can become searchable and easy to copy for any testing. There is a format button {} available to make it easy.
– PolyGeo ♦
Commented Oct 7, 2015 at 8:30
This answer saved my ass today.
– ideamotor
Commented Mar 4, 2016 at 21:48

Add a comment |

PolyGeo · Accepted Answer · 2016-07-06 05:47:08Z

1

I had been use SLD programming for polygon fill might be it will help you, have look my code,

    <Rule>
        <PolygonSymbolizer>
                <Fill>
                     <CssParameter name="fill">
                        <ogc:Function name="env">
                            <ogc:Literal>color</ogc:Literal>
                            <ogc:Literal>#E6E6E6</ogc:Literal>
                        </ogc:Function>
                     </CssParameter>
                </Fill>
        </PolygonSymbolizer>
    </Rule>

edited Jul 6, 2016 at 5:47

PolyGeo♦

65.3k29 gold badges112 silver badges343 bronze badges

answered Jul 6, 2016 at 5:14

nexttus

111 bronze badge

Add a comment |

Marcelo Villa · Accepted Answer · 2018-03-24 19:30:05Z

Well maybe too late, but for whom this could be of any help, this is an example of a filter using variable substitution that worked for me:

       <ogc:Filter>
          <ogc:And>
              <ogc:PropertyIsEqualTo>
                <ogc:PropertyName>agno</ogc:PropertyName>
                  <ogc:Function name="env">
                  <ogc:Literal>year</ogc:Literal>
                  <ogc:Literal>2010</ogc:Literal>
                  </ogc:Function>
              </ogc:PropertyIsEqualTo>
              <ogc:PropertyIsEqualTo> 
                <ogc:PropertyName>mes</ogc:PropertyName>
                  <ogc:Function name="env">
                  <ogc:Literal>month</ogc:Literal>
                  <ogc:Literal>5</ogc:Literal>
                  </ogc:Function>
              </ogc:PropertyIsEqualTo>
          </ogc:And>
      </ogc:Filter>

Then, in the WMS request, if I want to get the map of, lets say, December 1985, I send parameters like this:

...&env=year:1985;month:12&...

I think there is a mistake in the Geoserver online user manual, where is said:

...&env=name1:value1;name2=value2&...

Instead it should be:

...&env=name1:value1;name2:value2&...

Where is the difference for the last 2 lines of code?
– SeGa
Commented Aug 7, 2018 at 15:40 — SeGa, Commented Aug 7, 2018 at 15:40

pjhooker · Accepted Answer · 2020-03-06 10:59:07Z

It's work! I request: GetMap and env param ..&env:myCol:population;break_1:75.79;..&.. <ogc:Filter> <ogc:PropertyIsGreaterThan>  <ogc:Function name="property"> <ogc:Function name="env"> <ogc:Literal>myCol</ogc:Literal> </ogc:Function> </ogc:Function>   <ogc:Function name="env"> <ogc:Literal>break_1</ogc:Literal> </ogc:Function> </ogc:PropertyIsGreaterThan> </ogc:Filter>

Kadir Şahbaz · Accepted Answer · 2020-03-26 09:42:31Z

Post:
http://localhost:8080/geoserver/LPDB/wms?service=WMS&version=1.1.0&request=GetMap&layers=LPDB:lpdb_test_polygon&&env=color:40e0d0;opacity:1;&styles=&bbox=31.302,29.9575,31.3153,29.9621&width=954&height=330&srs=EPSG:4326&format=application/openlayers

SLD :

<?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>Simple polygon with stroke</Name>
    <UserStyle>
      <Title>SLD Cook Book: Simple polygon with stroke</Title>
      <FeatureTypeStyle>
        <Rule>
          <PolygonSymbolizer>
            <Fill>
              <CssParameter name="fill">
                #<ogc:Function name="env">
                  <ogc:Literal>color</ogc:Literal>
                  <ogc:Literal>FF0000</ogc:Literal>
               </ogc:Function>
              </CssParameter>
              <CssParameter name="fill-opacity">
                <ogc:Function name="env">
                  <ogc:Literal>opacity</ogc:Literal>
                  <ogc:Literal>1</ogc:Literal>
               </ogc:Function>            
              </CssParameter>
            </Fill>

            <Stroke>
              <CssParameter name="stroke">#FFFFFF</CssParameter>
              <CssParameter name="stroke-width">2</CssParameter>
            </Stroke>
          </PolygonSymbolizer>
        </Rule>
      </FeatureTypeStyle>
    </UserStyle>
  </NamedLayer>
</StyledLayerDescriptor>

Stack Exchange Network

Is there a way to set the attribute name dynamically via sld substitution in Geoserver?

6 Answers 6

Your Answer

Not the answer you're looking for? Browse other questions tagged
geoserver
sld
or ask your own question.

Hot Network Questions

Is there a way to set the attribute name dynamically via sld substitution in Geoserver?

6 Answers 6

Your Answer

Sign up or log in

Post as a guest

Not the answer you're looking for? Browse other questions tagged geoserversld or ask your own question.

Related

Hot Network Questions

Not the answer you're looking for? Browse other questions tagged
geoserver
sld
or ask your own question.