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The USGS Lidar data is a treasure trove, I use it a lot at work. What did you do to actually count trees? Even from aerial Lidar it can be a bit finicky for cl
by fnands 7mo ago
The USGS Lidar data is a treasure trove, I use it a lot at work.
What did you do to actually count trees? Even from aerial Lidar it can be a bit finicky for closed canopies.
- whalesalad 7mo agoIt's very rudimentary: smooth the canopy and find the local maxima above a base height. It's really just identifying the tallest points. Here is the first pass, https://i.imgur.com/f7Gpxmm.png https://i.imgur.com/f7Gpxmm.png, it under counted and also even counted my house as a tree, lol.
- fnands 7mo ago> counted my house as a tree Even the more sophisticated algorithms pretty much always do this ;-) You are probably not interested in taking this further, but you could give the Li tree filter a try: https://pdal.org/en/stable/stages/filters.litree.html https://pdal.org/en/stable/stages/filters.litree.html But getting perfect segmentation is basically impossible.