Day HRV Clouds RGB (Legacy)
Main application
- Monitoring convection
- Monitoring clouds using high-resolution imagery
- This is a very early RGB type, developed before the availability of multiple high-resolution channels.
- It produces visually appealing, easy-to-interpret images.
- The RGB combines information on cloud optical thickness and cloud top temperature.
- For SEVIRI, the HRV channel was the only high-resolution channel available, which is why it was used in both the red and green colour beams.
- With MTG FCI, all shortwave channels now offer higher resolution than the IR channels, eliminating the need to duplicate the same shortwave channel in two colour beams.
- Day Cloud Convection RGB is a version of this RGB (for any of the newest imagers that have advance resolution for visible channels) with only slightly different tuning.
SEVIRI Day HRV Clouds RGB
| Colour beam |
Channel (difference) |
Range min |
Range max |
Unit |
Gamma |
| Red |
HRV |
0 |
100 |
% |
1.0 |
| Green |
HRV |
0 |
100 |
% |
1.0 |
| Blue |
IR10.8 |
323 |
203 |
K |
1.0 |
ABI Day Cloud Convection RGB
| Colour beam |
Channel (difference) |
Range min |
Range max |
Unit |
Gamma |
| Red |
VIS0.64 |
0 |
100 |
% |
1.7 |
| Green |
VIS0.64 |
0 |
100 |
% |
1.7 |
| Blue |
IR10.3 |
323 |
203 |
K |
1.0 |
HRV Fog RGB (Legacy)
Main applications
- Monitoring fog/low cloud and snow-covered land in high resolution
- General cloud monitoring, including information on cloud phase and optical thickness
- It produces visually appealing, easy-to-interpret images.
- For SEVIRI, the HRV channel was the only high-resolution channel available, which is why it was used in two colour beams.
- With MTG FCI, shortwave channels have higher resolution than the IR channels, eliminating the need to duplicate the same shortwave channel in two colour beams.
- This RGB has been superseded by more advanced product such as the Cloud Phase RGB and Cloud Type RGB, which offer improved capabilities for detecting snow and low clouds.
SEVIRI HRV Fog RGB
| Colour beam |
Channel (difference) |
Range min |
Range max |
Unit |
Gamma |
| Red |
NIR1.6 |
0 |
70 |
% |
1.0 |
| Green |
HRV |
0 |
100 |
% |
1.0 |
| Blue |
HRV |
0 |
100 |
% |
1.0 |
Day Snow-Fog RGB (Legacy)
Alternative name: Snow RGB
MSG SEVIRI Snow RGB -- 19 February 2025, 10:30 UTC
Main applications
- Snow detection
- Differentiation betweem fog/stratus and snow-covered surfaces
- For snow detection, the Cloud Phase RGB and Cloud Type RGB are also highly effective, Particularly as they use two microphysical NIR channels where snow's reflectance is low.
- For cloud detection, the Cloud Phase RGB generally performs better than the Snow RGB.
RGB Recipes by Satellite Instrument
MSG SEVIRI Day Snow-Fog RGB
| Colour beam |
Channel (difference) |
Range min |
Range max |
Unit |
Gamma |
| Red |
VIS0.8 |
0 |
100 |
% |
1.7 |
| Green |
NIR1.6 |
0 |
70 |
% |
1.7 |
| Blue |
IR3.9refl |
0 |
30 |
% |
1.7 |
GOES ABI Day Snow-Fog RGB
| Colour beam |
Channel (difference) |
Range min |
Range max |
Unit |
Gamma |
| Red |
NIR0.86 |
0 |
100 |
% |
1.7 |
| Green |
NIR1.6 |
0 |
70 |
% |
1.7 |
| Blue |
IR3.9 -- IR10.3 |
0 |
30 |
K |
1.7 |
Himawari AHI Day Snow-Fog RGB
| Colour beam |
Channel (difference) |
Range min |
Range max |
Unit |
Gamma |
| Red |
NIR0.86 |
0 |
102 |
% |
1.6 |
| Green |
NIR1.6 |
0 |
68 |
% |
1.7 |
| Blue |
IR3.9 refl |
2 |
45 |
% |
1.95 |
FY4 AGRI Snow RGB
| Colour beam |
Channel (difference) |
Range min |
Range max |
Unit |
Gamma |
| Red |
NIR0.825 |
0 |
100 |
% |
1.7 |
| Green |
NIR1.6 |
0 |
60 |
% |
1.7 |
| Blue |
IR3.75 refl |
0 |
30 |
% |
1.7 |