isOpticalPathActive (opticalPathIdentifier) {
    const channel = this.getOpticalPath(opticalPathIdentifier)
    if (channel === null) {
      return false
    }

    return !!this[_map].getLayers().getArray().find(layer => {
      return layer === channel.tileLayer
    })
  }
/** Returns if the channel is being rendered
   * @param {string} opticalPathIdentifier - opticalPath of the channel
   * @return {boolean} active
   */
Returns if the channel is being rendered
@param {string} opticalPathIdentifier - opticalPath of the channel
@return {boolean} active
Returns if the channel is being rendered @param { string } opticalPathIdentifier - opticalPath of the channel @return { boolean } active
isOpticalPathActive (opticalPathIdentifier) {
    const channel = this.getOpticalPath(opticalPathIdentifier)
    if (channel === null) {
      return false
    }
    return !!this[_map].getLayers().getArray().find(layer => {
      return layer === channel.tileLayer
    })
  }
isOpticalPathActive ( opticalPathIdentifier ) { const channel = this . getOpticalPath ( opticalPathIdentifier ) if ( channel === null ) { return false } return ! ! this [ _map ] . getLayers ( ) . getArray ( ) . find ( layer => { return layer === channel . tileLayer } ) }
Returns if the channel is being rendered
 @param {string} opticalPathIdentifier - opticalPath of the channel
 @return {boolean} active
Returns if the channel is being rendered @param { string } opticalPathIdentifier - opticalPath of the channel @return { boolean } active