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A ROS node will be responsible for controlling the LiDAR, reading the scan data and publishing /scan topics which other nodes can subscribe to. Also the /scan topics (along with other desired topics) can be “recorded” with a ROS utility, for later “playback”.
So no, ROS cannot use .LAS format scans. The manufacturer of your LiDAR will have a ROS and ROS2 node that you will install and run on your ROS robot.
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