(A) One of the measurement trajectories (in red) during a flight near Aérodrome de Môtiers, Môtiers, flown in E direction. The inset indicates the vegetation classification using NDVI where the white is classified as non-grass (same color bar and scale as B). Satellite image by Swiss Federal Authorities, CNES; Spot Image, Swisstopo, NPOC. (B) Qualitative reflectance data for the trajectory per wavelength in time (s). (C) V/I for the trajectory per wavelength in time (s). (D) Time-averaged reflectance of the grass and road, respectively. (E) Time-averaged V/I of the grass and road, respectively. Shaded areas denote the standard deviation between measurements.