我使用ROS建图的时候，用的是Kinect的深度信息转换成laser scan，Rviz仿真环境调用出laser scan信息的时候显示如下错误：
Transform [sender=unknown_publisher] For frame [camera_depth_frame]: No transform to fixed frame [map]. TF error: [Lookup would require extrapolation into the future. Requested time 1554964684.878786069 but the latest data is at time 1554964684.525343790, when looking up transform from frame [camera_depth_frame] to frame [map]]
最后发现错误是因为编码器数据发布的频率太快，将原本30Hz的发布频率改成10Hz的频率即可！
//使用10Hz的频率发布信息
ros::Rate r(10);