Implementation of point cloud ground filtering algorithms:

• filtering by TIN refinement
• filtering by Cloth Simulation Filtering (CSF https://www.cloudcompare.org/doc/wiki/index.php?title=CSF_(plugin))

This implementation uses the knowledge described in the 3D terrain book: https://github.com/tudelft3d/terrainbook

The code runs based on the parameters in params.json file, which specifies:

• input file (.laz format)

• for TIN refinement:

  • output pointcloud file (.laz format)
  • resolution of the initial grid used for selecting the lowest point in each cell
  • distance [m] and angle[°] for the ground test

• for CSF

  • output pointcloud file (.laz format)
  • resolution of the cloth grid
  • epsilon_zmax - if the maximum displacement of all the cloth particles in an iteration becomes smaller than this value, the cloth stops falling.
  • epsilon_ground - used for classifying the points as ground if they are within epsilon_ground distance of the cloth in its final position

For more details look at example params.json