Is it possible to adapt Phogrammetrical dense point cloud to use as an input on lidR?

[tatopm91]

I was wondering if it would be possible to use as an input for you package a dense point cloud exported from a Photogrammetrical process (x,y,z) in order to segment this forest pointcloud with the same workflow.

I tried it and besides some warnings it worked until the moment I used the function segment_trees( ) where it came the error:

"Error: No attribute 'ReturnNumber' found. This attribute is needed to extract first returns"

I understand this is a unique attribute that is contained in a pointcloud obtained by LiDAR. But it could be possible to create this attribute for my pointcloud in order to continue the workflow and detect individual trees?

[Jean-Romain]

Add it and fill it with ones

las@data$ReturnNumber <- 1L

[tatopm91]

Thank you very much! It worked perfectly