This repository adapts the state-of-the-art lidar inertial odometry algorithm, Point-LIO, for use with our lidar, Unitree Lidar L1.

Unitree Lidar L1 is a low-cost large-FOV 3D lidar, which possesses these features:

• large field of view (360° × 90°)
• non-repetitive scanning
• low cost (only $349)
• suitable for applications in low-speed mobile robots

If you want to learn more about our lidar, you can refer to the official website for details.

• https://m.unitree.com/en/LiDAR/

Point-LIO is a robust and high-bandwidth lidar inertial odometry (LIO) with the capability to provide accurate, high-frequency odometry and reliable mapping under severe vibrations and aggressive motions. If you need further information about the Point-LIO algorithm, you can refer to their official website and paper:

• https://github.com/hku-mars/Point-LIO
• Point‐LIO: Robust High‐Bandwidth Light Detection and Ranging Inertial Odometry

We tested our code on Ubuntu20.04 with ROS noetic. Ubuntu18.04 and lower versions have problems of environments to support the Point-LIO, try to avoid using Point-LIO in those systems.

You can refer to the official website to install ROS noetic:

• http://wiki.ros.org/noetic/Installation/Ubuntu

Additional ROS package is required:

sudo apt-get install ros-xxx-pcl-conversions

Following the official Eigen installation, or directly install Eigen by:

sudo apt-get install libeigen3-dev

You should download and build unitree_lidar_ros follwing these steps:

git clone https://github.com/unitreerobotics/unilidar_sdk.git

cd unilidar_sdk/unitree_lidar_ros

catkin_make

Clone this repository and run catkin_make:

mkdir -p catkin_point_lio_unilidar/src

cd catkin_point_lio_unilidar/src

git clone https://github.com/unitreerobotics/point_lio_unilidar.git

cd ..

catkin_make

Firstly, you should connect our lidar to your PC serial port, and supply power for the lidar with a 12V charger.

Besides, to ensure proper initialization of the IMU, it is advisable to keep the lidar in a stationary state during the initial few seconds of algorithm execution.

Run unilidar:

cd unilidar_sdk/unitree_lidar_ros

source devel/setup.bash

roslaunch unitree_lidar_ros run_without_rviz.launch

Run Point-LIO:

cd catkin_unilidar_point_lio

source devel/setup.bash

roslaunch point_lio_unilidar mapping_unilidar.launch 

After completion of the run, all cached pointcloud map will be saved to the following path:

catkin_point_lio_unilidar/src/point_lio_unilidar/PCD/scans.pcd

You can use the pcl_viewer tool to view this pcd file:

pcl_viewer scans.pcd 

If you don't have our lidar for now, you can download our dataset recorded with our lidar and run testify this algorithm with it. The download address is here:

• unilidar-2023-09-22-12-42-04.bag - Download

Run Point-LIO:

cd catkin_point_lio_unilidar

source devel/setup.bash

roslaunch point_lio_unilidar mapping_unilidar.launch 

Play the dataset you downloaded:

rosbag play unilidar-2023-09-22-12-42-04.bag 

After completion of the run, all cached pointcloud map will be saved to the following path:

catkin_point_lio_unilidar/src/point_lio_unilidarPCD/scans.pcd

You can use the pcl_viewer tool to view this pcd file:

pcl_viewer scans.pcd 

• Adapt Point-LIO for Unitree Lidar L1
• Upload codes and dataset

• Add video demo

• Update launch file in README.md