LiDAR Data Processing with Python

A LiDAR sensor can capture thousands or millions of distance measurements, but a cloud of points is not automatically a robot-ready map. Raw scans must be inspected, cleaned, transformed, aligned, segmented, and converted into spatial information that navigation software can use.

LiDAR Data Processing with Python teaches that complete workflow step by step. Using Python, NumPy, Open3D, laspy, SciPy, Matplotlib, scikit-learn, optional PDAL tools, and ROS 2 concepts, you will learn how to turn point clouds into practical occupancy, elevation, and traversability maps for autonomous mobile robots.

This beginner-friendly guide will help you:

• Understand how LiDAR sensors measure distance and produce point clouds
• Work with X, Y, and Z coordinates, intensity, returns, timestamps, classifications, and colour attributes
• Prepare a clean Python workspace for point-cloud processing
• Load, inspect, and convert PCD, PLY, LAS, LAZ, XYZ, CSV, and NumPy point-cloud files
• Read large LiDAR files safely without exhausting memory
• Visualise point clouds from multiple viewpoints using Open3D and Matplotlib
• Remove invalid coordinates, distant points, robot-body points, noise, and outliers
• Use voxel, uniform, random, statistical, radius, and intensity-based filtering methods
• Work with coordinate frames, translation, rotation, transformation matrices, and sensor-to-robot conversions
• Detect ground surfaces, slopes, ramps, and height above ground
• Segment floors, walls, ceilings, pallets, boxes, and other objects
• Group points with DBSCAN and measure objects with bounding boxes
• Align and combine multiple scans using registration and ICP concepts
• Create two-dimensional occupancy grid maps for robot navigation
• Build elevation and traversability maps that identify slopes, rough ground, curbs, steps, and unsafe terrain
• Process recorded and live robot LiDAR data safely
• Connect processed clouds and maps to ROS 2 navigation workflows
• Improve performance with chunking, tiling, reusable functions, configurable pipelines, and batch jobs
• Build a complete robot-ready mapping pipeline as the final project

The book builds one practical workflow rather than disconnected demonstrations. You will begin by inspecting individual point-cloud files, then progress through cleaning, transformation, ground detection, segmentation, registration, occupancy mapping, elevation mapping, traversability analysis, ROS 2 publishing, and complete pipeline organisation.

No LiDAR sensor is required to begin. Sample files support the core exercises, while live-data and robot-navigation sections can be explored later with suitable hardware and ROS 2 software.

The focus is practical robot mapping. You will learn why coordinate frames, units, thresholds, timestamps, map resolution, obstacle expansion, and validation matter before a robot is allowed to trust the resulting map.