The construction and stone-cutting of columns in Gothic construction rules the transmission of the thrusts of the vaults to the ground. The morphologic and typological definition of these elements is essential. In the cathedral of Tortosa was defined an experimental structural model with a double ambulatory, with the construction of the ring of chapels between 1377 and 1424. These chapels are singular since they are not separated by a wall, as uses in Meridional Gothic. The suppression of this wall was after debated in the Cathedral of Milan in 1392. The survey of these columns through noninvasive techniques, such as Terrestrial Laser Scanner and Ground Penetrating Radar has enabled to identify essential differences between them. The study concluded that these columns are homogeneous only in the base and the first three rows of the body and near the impost, which are the areas were concentrates the main transmission of loads.