lvi-sam/config/params_lidar_raw.yaml

# project name
PROJECT_NAME: "lvi_sam"

lvi_sam:

  # Topics
  pointCloudTopic: "/points_raw"               # Point cloud data
  imuTopic: "/imu_raw"                         # IMU data

  # Heading
  useImuHeadingInitialization: true          # if using GPS data, set to "true"
  
  # Export settings
  savePCD: false                              # https://github.com/TixiaoShan/LIO-SAM/issues/3
  savePCDDirectory: "/Downloads/LOAM/"        # in your home folder, starts and ends with "/". Warning: the code deletes "LOAM" folder then recreates it. See "mapOptimization" for implementation

  # Sensor Settings
  N_SCAN: 16                                  # number of lidar channel (i.e., 16, 32, 64, 128)
  Horizon_SCAN: 1800                          # lidar horizontal resolution (Velodyne:1800, Ouster:512,1024,2048)
  timeField: "time"                           # point timestamp field, Velodyne - "time", Ouster - "t"
  downsampleRate: 1                           # default: 1. Downsample your data if too many points. i.e., 16 = 64 / 4, 16 = 16 / 1 

  # IMU Settings
  imuAccNoise: 3.9939570888238808e-03
  imuGyrNoise: 1.5636343949698187e-03
  imuAccBiasN: 6.4356659353532566e-05
  imuGyrBiasN: 3.5640318696367613e-05
  imuGravity: 9.80511
  
  # Extrinsics (lidar -> IMU)
  extrinsicTrans: [0.0, 0.0, 0.0]
  extrinsicRot: [-1, 0, 0, 0, 1, 0, 0, 0, -1]
  extrinsicRPY: [0, 1, 0, -1, 0, 0, 0, 0, 1]

  # LOAM feature threshold
  edgeThreshold: 1.0
  surfThreshold: 0.1
  edgeFeatureMinValidNum: 10
  surfFeatureMinValidNum: 100

  # voxel filter paprams
  odometrySurfLeafSize: 0.4                     # default: 0.4
  mappingCornerLeafSize: 0.2                    # default: 0.2
  mappingSurfLeafSize: 0.4                      # default: 0.4

  # robot motion constraint (in case you are using a 2D robot)
  z_tollerance: 1000        # meters
  rotation_tollerance: 1000 # radians

  # CPU Params
  numberOfCores: 4                              # number of cores for mapping optimization
  mappingProcessInterval: 0.15                  # seconds, regulate mapping frequency

  # Surrounding map
  surroundingkeyframeAddingDistThreshold: 1.0   # meters, regulate keyframe adding threshold
  surroundingkeyframeAddingAngleThreshold: 0.2  # radians, regulate keyframe adding threshold
  surroundingKeyframeDensity: 2.0               # meters, downsample surrounding keyframe poses   
  surroundingKeyframeSearchRadius: 50.0         # meters, within n meters scan-to-map optimization (when loop closure disabled)

  # Loop closure
  loopClosureEnableFlag: true
  surroundingKeyframeSize: 25                   # submap size (when loop closure enabled)
  historyKeyframeSearchRadius: 20.0             # meters, key frame that is within n meters from current pose will be considerd for loop closure
  historyKeyframeSearchTimeDiff: 30.0           # seconds, key frame that is n seconds older will be considered for loop closure
  historyKeyframeSearchNum: 25                  # number of hostory key frames will be fused into a submap for loop closure
  historyKeyframeFitnessScore: 0.3              # icp threshold, the smaller the better alignment

  # Visualization
  globalMapVisualizationSearchRadius: 1000.0    # meters, global map visualization radius
  globalMapVisualizationPoseDensity: 10.0       # meters, global map visualization keyframe density
  globalMapVisualizationLeafSize: 1.0           # meters, global map visualization cloud density