ROS保存点云到pcd

1)subscibe topic and save as pcd (保存点云到PCD)
  rosrun pcl_ros pointcloud_to_pcd input:=/point_cloud_topic _prefix:=./pcd_save_path

2)bag to pcd （bag转成PCD）
  rosrun pcl_ros bag_to_pcd <input_file.bag> <topic> <output_directory>