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r-lidar / lidR

Airborne LiDAR data manipulation and visualisation for forestry application
https://CRAN.R-project.org/package=lidR
GNU General Public License v3.0
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Clarification about resolution units for sample_maxima (highest and lowest) #765

Closed mcgregorian1 closed 1 month ago

mcgregorian1 commented 1 month ago

Hi, I've been trying to determine what the resolution of the highest() and lowest() grids for use within decimate_points() means in real-world terms - is it in meters? I.e., for highest() the default is 1m resolution grid and the highest point within each 1m x 1m grid cell are kept?

If this is correct, can this language please be added to the documentation? I've searched through the CRAN pdf as well as the vignettes, but there is no wording explicitly saying that the res argument is in meters. Or if this is described elsewhere, can you please point me to that?

Thanks!

Jean-Romain commented 1 month ago

the resolution and all other value with units are in the units of the point cloud. It keeps the highest point for each 1x1 cell of the grid. 1 being likely one meter or sometime one foot.