Spectral signature of different soils in the areas of olive groves in east Lesvos island, Greece. On the horizontal axis we have the central wavelength in nanometers (nm) and on the vertical axis the reflectance of soils in W/m^-2/sr^-1/μm^-1. Highest reflectance have the calcareous soils and the coarse sand. While red soils have the lowest reflectance due to the small diameter of the granules and the higher humidity.