Colour Interpretation Guide


desert

date
Meteosat Second Generation

length
Snow RGB - Recipe

author
Red: VIS0.8
Green: NIR1.6
Blue: IR3.9 refl

Deserts

Sandy desert appears light blue in the Snow RGB images, in some areas with greenish shades. More greenish shades appear at lower solar elevations. Rocky desert appears medium blue (see the images below and left).

desert
Meteosat, SEVIRI Snow RGB for 27 December 2014, 12:00 UTC

water
Meteosat, SEVIRI Snow RGB for 27 December 2014 08:00 UTC

Explanation of the colours for sandy desert (see also the recipe on the left side):

• The reflectivity of sand is higher in the NIR1.6 channel than in the VIS0.8 channel. After linear stretching, the green signal will be even higher compared to the red beam (see the ranges in the recipe). For high solar elevation usually both, the green and the blue components saturate, while the red component is also considerably high. The resulting colour will be light blue. If the solar elevation is lower, then the sandy desert is shown in greenish tones in some areas.