Normalize the point cloud using triangulate and transform_with. This process involves
triangulating the ground points and then using transform_with to linearly interpolate the elevation
for each point within the corresponding triangles. The normalize() function modifies the Z elevation
values, effectively flattening the topography and normalizing the point cloud based on Height Above Ground (HAG).
In contrast, the hag() function records the HAG in an extrabyte attribute named 'HAG', while preserving
the original Z coordinates (Height Above Sea Level).
Examples
f <- system.file("extdata", "Topography.las", package="lasR")
pipeline <- reader() + normalize() + write_las()
exec(pipeline, on = f)
#> [1] "/tmp/RtmpUXX9w7/Topography.las"