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I am a beginner in working with WMS services. In OpenLayers I retrieved a file (EEZ 200 NM) from GeoServer to which I would like to change the fill color. Is that anyway possible from OpenLayers?

    const source_eez_WMS = new ol.source.TileWMS({
      url: 'https://geo.vliz.be/geoserver/MarineRegions/wms?service=WMS&version=1.3.0&request=GetCapabilities',
      params: {
        'FORMAT': 'image/png', 
         tiled: true,
         STYLES: '',
         LAYERS: 'eez'
    
      },
      serverType:'geoserver',
      crossOrigin: 'anonymous'
    });
    const layer_eez_WMS = new ol.layer.Tile({
        source: source_eez_WMS,
        visible:true
     });
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    You'd need to send an updated style, using the the SLD or SLD_BODY parameters to the service. The service would change the style and send back an updated image
    – nmtoken
    Commented Dec 1, 2022 at 13:03
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    Or you could use the WFS and get the vector data and style it in your client
    – nmtoken
    Commented Dec 1, 2022 at 13:07
  • Thanks for the information. I will study how to use SLD and try to apply it, as WFS is not feasible (the file is way too big)
    – Elena Politi
    Commented Dec 1, 2022 at 15:15

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