Point cloud index ENL

Effective number of layers (ENL).

For ENL0 with Hill-Number 0D.

For ENL1 with Hill-Number 1D.

For ENL2 with Hill-Number 2D.

Reference: Martin Ehbrecht et al.: Effective number of layers: A new measure for quantifying threedimensional stand structure based on sampling with terrestrial LiDAR, Forest Ecology and Management (2016) 380: 212–223, https://doi.org/10.1016/j.foreco.2016.09.003