The Hard Surface Routine is based off a planar fit algorithm, which is quite different than the traditional ground classification algorithm traditionally used for airborne LIDAR data. The hard surface routine will classify the dominant, median surface points. This provides an alternative to the traditional ground classification routine. The result is usually better performance on paved surfaces. You may need to draw polygons for paved areas to be able to classify terrain using Ground and paved areas using the Hard surface routine.
- Plane Tolerance – Goodness of fit for the dataset
- Max Terrian – max slope of triangle within the plane
- Iteration Angle – the iteration angle is the angle between the triangle plane and a line connecting the potential point with the closest triangle vertex
- Minimum Detail – Minimum Plane Size
- Minimum triangle – Classification Limit
Ground vs Hard Surface