Comparison of AVHRR and SEVIRI Natural Color RGB images
The recipes of SEVIRI and AVHRR Natural Color RGBs are the same (Table 2). The channels are spectrally fairly similar. The ranges - where the images should be linearly stretched - are the same.
| AVHRR Natural Color RGB | ||||
|---|---|---|---|---|
| Color beam | Channel | Range | ||
| Red | NIR1.61 | 0 | 100 | % |
| Green | NIR0.87 | 0 | 100 | % |
| Blue | VIS0.63 | 0 | 100 | % |
| SEVIRI Natural Colors RGB | ||||
|---|---|---|---|---|
| Color beam | Channel | Range | ||
| Red | NIR1.6 | 0 | 100 | % |
| Green | NIR0.8 | 0 | 100 | % |
| Blue | VIS0.6 | 0 | 100 | % |
Table 2: Recipes of the AVHRR and SEVIRI Natural Color RGB schemes
Figs. 13 and 14 show examples of AVHRR and the most closely matching SEVIRI Natural Color RGB images. They are very similar, with some differences in shades and brightness due to
- different scanning mode,
- different spatial resolution,
- spectral differences of the channels: different central wavelengths and channel widths.
Figure 13: METOP-A AVHRR (left) and MSG SEVIRI (right) Natural Colour RGB images on 12 April 2016 at 09:16 and 09:10 UTC
Figure 14: AVHRR (up) and MSG SEVIRI (bottom) Natural Colour RGB images on 2 October 2013, at 09:14 and 09:10 UTC