[
  { "timestamp": "t1", "sensor": "lidar", "x": 1.0, "y": 1.0 },
  { "timestamp": "t1", "sensor": "odometry", "x": 0.9, "y": 1.1 },
  { "timestamp": "t2", "sensor": "lidar", "x": 1.8, "y": 1.6 },
  { "timestamp": "t2", "sensor": "odometry", "x": 1.7, "y": 1.5 }
]