Day Cloud Phase RGB

Alternative name: Cloud Phase RGB

Main applications (Daytime)

• Detection of cloud phase (e.g., liquid water, ice, mixed phase)

• Monitoring of low and high cloud features

• Analysis of cloud top microphysics, including particle size detection

Remarks

• This RGB provides enhanced information on cloud top microphysics (phase and effective particle size) for optically thick clouds.

• Colours may become oversaturated at high solar zenith angles (near the terminator line).

• Rayleigh correction for the VIS0.64 channel is generally not necessary.

• For NIR channels, an alternative range of 0-70% reflectance should also be tested to assess if it may demonstrate better results.

RGB Recipes by Satellite Instrument

MTG FCI Day Cloud Phase RGB

Agreed upon at the online workshop 2026-05-13

Proposed (M. Setvák, O. Nedělčev, I. Smijanic, 2026)

Colour beam	Channel (difference)	Range min	Range max	Unit	Gamma
Red	NIR1.6	5	60	%	1.0
Green	NIR2.3	0	60	%	1.0
Blue	VIS0.6	0	100	%	1.1

Himawari AHI Day Cloud Phase RGB

Colour beam	Channel (difference)	Range min	Range max	Unit	Gamma
Red	NIR1.6	0	50	%	1.0
Green	NIR2.3	0	50	%	1.0
Blue	VIS0.64	0	100	%	1.0

GOES ABI Day Cloud Phase RGB

Colour beam	Channel (difference)	Range min	Range max	Unit	Gamma
Red	NIR1.6	0	50	%	1.0
Green	NIR2.3	0	50	%	1.0
Blue	VIS0.64	0	100	%	1.0