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I'm pretty new to WMS Services.

I do a "GetFeatureInfo" request on a WMS service. The metadata also contains a polygon geometry of a place that I am interested in, and that I want to highlight in the final image.

When doing the "GetMap" request, I provide a BBOX with the desired area. But is there a way to pass the polygon to highlight it ?

I read something about "HIGHLIGHT_GEOM" query parameter, but this seems to be ignored by the WMS server.

Doing a postprocessing of the image sounds terrifying to me.

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    Hightlight is something that is not directly supported by the WMS standard but there are some workarounds. See for example gis.stackexchange.com/questions/173867/…. In a browser application it might be easiest to capture the feature geometry and render that on top of the WMS map as a separate layer. See also gis.stackexchange.com/questions/139832/…
    – user30184
    Commented May 7 at 12:01
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    You can send a custom SLD as part of a GetMap request if you know the id of the underlying feature, and the WMS will return an image with the polygon coloured up according to your sent style
    – nmtoken
    Commented May 7 at 12:37

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