const currentsLayer = new ImageryTileLayer({
          url: "https://tiledimageservices.arcgis.com/jIL9msH9OI208GCb/arcgis/rest/services/Spilhaus_UV_ocean_currents/ImageServer",
          renderer: {
            type: "flow",  // autocasts to new FlowRenderer
            density: 1,
            maxPathLength: 10,
            trailWidth: "2px"
          },
          blendMode: "destination-in"
        });