Visibility at Italian natural parks: preliminary data from the first-ever pilot project by ENEA and CUFAA, Petralia, Ettore, La Torretta Teresa M. G., Stracquadanio Milena, Malaguti Antonella, Cremona Giuseppe, Papitto Giancarlo, Cocciufa Cristiana, Gualtieri Maurizio, and Piersanti Antonio , 6th International Congress on Biodiversity - TRAPANI (Italy), 2-3 September 2022 , (2022)