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I found this method much easier to get the parameter value from the server

 double map_resolution;
  // **rosparam list** < use this command to see all the parameters
  if (ros::param::get("/move_base/global_costmap/resolution", map_resolution))
  {
    ROS_INFO("map resolution: %f",map_resolution);
  }
  else
      ROS_INFO("couldn't get map resolution");

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