Introducing an innovative methodology for mapping rock-discontinuities, based on the interpretation of 3D photogrammetry products. The case of Akronafplia castle - Vassilakis, E; Stavropoulou, M.; Konsolaki, A.; Giannopoulos, I; Petrakis, S.; Kotsi, E.; Lekkas, E.; Kokkoromytis, A (16th International Congress of the Geological Society of Greece, 2022)