Numerical comparisons indicate that the average pair-wise distance obtained by GBR was 1.326 mm and 1.285 for the average global distance. The performance of GBR should be investigated through the definition of the learners. To keep the learners weak, constraints were imposed on the number of leaves and the depth of the trees. The assigned constraints to maintain the trees small, have led to propagate error in the whole sequence of model, which is noticeable through the increase of the errors in comparison with RF; however, more research could be performed in future in order to improve the understanding of this behaviour.