2026/02/16

Results since previous meeting

• Improved the setup of the project (mainly C++ and its dependencies)
• Installed and set up the IGN laptop
• Improved the process of identifying roof edges, separating multi-echo from single echo
• Created a script to extract single scanner lines randomly from an input LAS file (for visualization purposes)
• Made a small script to read the BD TOPO as GeoParquet

Material for discussion

Overview of the pipeline

Overview of the pipeline

Figure 1

Questions

• There are often points with a number of returns higher than 1, except the other returns are missing. How is this possible?
• Sometimes we have two successive points with a number of returns higher than 1 on the roof. How is that possible?

Discussion

Work until next meeting

• Separation of cases based on the angle of the points
• Find situations with missing points of multiple returns and successive points which hit the roof and the ground