Classification of Low & Medium Vegetation

[Flint Freakwood]

Hello people! Generally speaking the work with LAStools is a breeze and everything works out fine. I have a problem which I can't solve by reading the readme file though. How do you guys approach the classification of low & medium vegetation? Do you just change the height threshold and somehow tell LAStools to classify the results of that as class 3 or 4? If so, how do you determine a value for the heighest piece of vegetation for each class? In my mind it looks something like "if point == vegetation and point == <3m set classification to 3" and the same goes for vegetation between 3m and 6m (which would be medium) and over 6m for high vegetation (in this case at least).

[Terje Mathisen]

That's exactly how I do it, only I use 1.3 as the cutoff between low and
medium and 3.5 for the split between medium and high. This is because
those limits make more sense for an orienteer where we want to determine
how much the vegetation will limit both running speed and visibility.

echo "Recalculating point heights and sorting into LOW/MEDIUM/HIGH
vegetation"
lasheight -i adaptive\*.laz -ilay -ignore_class 6 9 10 11 -drop_class 7
-drop_below -5 -drop_above 100 -classify_between 0.3 1.3 3
-classify_between 1.3 3.5 4 -classify_between 3.5 100 5 -odir
tiles_classified -olaz

Terje

--
- <Terje.M...@tmsw.no>
"almost all programming can be viewed as an exercise in caching"

[Flint Freakwood]

Hey Terje! Thanks a ton for sharing! I'll try it out and see where I put my limitations :)