Matching Model Tree IDs to Field Data in CloudCompare

[msacee2012-a11y]

Hello,

I have successfully segmented my forest point cloud and generated a CSV file containing tree IDs, heights, and DBH (Diameter at Breast Height), as shown in the data snippet below:

The Challenge:
I am now trying to validate this model output against my manual field measurements. However, I’m struggling to verify which tree_id in my CSV corresponds to the actual trees in the CloudCompare 3D environment and, subsequently, to my field data.

My Question:

1. Is there any ways to identify and match these specific Tree IDs to the filed level trees or points in the cloud?

[thomas-lowe]

Hi, yes the main way is to take the cloud_segmented.ply output from rayextract trees and run raysplit cloud_segmented.ply seg_colour. This splits the cloud into one file per colour, but converts the colour back into the tree id (the row in the _trees.txt file) and outputs each file with the suffix like _37.ply for tree ID 37.

There is a function in the code int convertColourToInt(const RGBA &colour) that does this. You may want to port it to python if you want to colour pick and output the tree ID.

If you are picking a point on the original (non-segmented) cloud then it should have the same point index as the _segmented.ply, so you could look up the colour in that cloud by point index.