 This study presents an automatic approach for olive tree dendrometric parameter estimation from airborne laser scanning, ALS, data using a unique combination of the alpha shape algorithm applied to normalized point cloud and principal component analysis. The method adjusts the alpha parameter based on a group of representative trees in an orchard for which classical field measurements were performed, and determines crown diameters as principal components of ALS points representing a delineated crown. The method was applied to a test area of an olive orchard in Spain and found to be equally good or even superior to previously investigated semi-automatic methods with an average error of 19% for tree height, 53% for crown base height, and 13% and 9% for the length of the longer diameter and perpendicular diameter, respectively. This article was authored by Ida Tohadas, Andrzej Borkowski, Javier Estonel, and others. We are article.tv, links in the description below.