LOAM modifications and implementations

Implementation details	Relevance
LOAM: Lidar Odometry and Mapping, 2014, CMU Detailed version of the paper in Springer (2017)
Repo: loam_velodyne ROS Supported data: VLP-16 + IMU (optional)
Repo: loam_velodyne_kitti_ros ROS Supported data: KITTI (HDL-64)
Repo: LOAM_NOTED Comments: repo with detailed Chinese comments on the code
Repo: A-LOAM (Advanced implementation for LOAM) ROS Supported data: VLP-16, HDL-32, HDL-64 Comments: uses Eigen and Ceres Solver to simplify code structure.
V-LOAM: Visual-Lidar Odometry and Mapping, 2015, CMU No implementation provided
LeGO-LOAM: Lightweight and Ground-Optimized Lidar Odometry and Mapping, 2018, Stevens Institute of Technology
Repo: LeGO-LOAM ROS Supported data: VLP-16 + IMU (optional)
LIOM: Tightly Coupled 3D Lidar Inertial Odometry and Mapping, 2019, Hong Kong University of Science and Technology
Repo: lio-mapping ROS Supported data: LiDAR + IMU (TBD)
LIO-SAM: Tightly-coupled Lidar Inertial Odometry via Smoothing and Mapping, 2020, MIT
Repo: LIO-SAM ROS Supported data: LiDAR + IMU + GPS (optional) (TBD)