Discussion on "Enhanced scour tests to evaluate pedestrian level winds" by F. Livesey, D. Morrish, M. Mikitiuk, N. Isyumov (J. Wind Eng. Ind. Aerodyn. 41-44 (1992) 2265-2276) and on "A visual technique for the evaluation of the pedestrian-level wind environment around buildings using infrared thermography" by M. Yamada, Y. Uematsu, R. Sasaki (J. Wind Eng. Ind. Aerodvn. 65 (1996) 261-271)