This function calculates the forest fraction cover (Fcov) from LiDAR data.
The Fcov is defined as the proportion of first returns above a specified
height threshold (default: 5 meters) relative to the total number of first returns.
Arguments
- z
A numeric vector representing the heights of LiDAR returns
- rn
An integer vector indicating the return number for each LiDAR point.
First returns are identified by a value of `1`
- th
a numeric vector of length one specifying the height threshold
Value
A numeric value representing the forest fraction cover,
which is the proportion of first returns with heights greater than 5 meters.
Examples
# Example data
z <- c(2, 6, 10, 4, 15)
rn <- c(1, 1, 2, 1, 1)
# Calculate forest fraction cover
lid_fcov(z, rn)
#> [1] 0.5
