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Greetings from a distance Stihl, thank you very much for the comment, gave me the idea to be able to make the classification of the points ...
I had to play with the parameters, see the difference and the different results I got with each parameter, my terrain is not so wavy, and the parameters I chose were: maximum angle 15 °, maximum distance 0.05 and cell size 10, between all the parameters, the indicated one gave me a better result classifying almost all the points of terrain, I hope to have implemented well my criteria for that selection ...
In any case, I would appreciate very much that based on your experience you can indicate any observations or recommendations to be taken into account in this procedure in the future ...
Again, thank you very much for the response, have a nice day ..
Atte.