Northern Serbia, satellite image. The colours (representing 13 spectral bands) indicate the state of the vegetation. Yellowish patches indicate soil or freshly ploughed land, while shades of blue (primarily at lower left) indicate either the same crop or different crops at a similar stage of growth. This information can be used to improve farming outputs and to manage environmental impacts. Image data obtained on 28 August 2016, by the Copernicus Sentinel-2 satellites.