SEVIRI RGB Cal Module - part II

• Chapter II: HRV Fog RGB
•  
• Physical basis
• Creating HRV Fog RGB images
• Typical colours
• Examples of interpretation
• Benefits and limitations
• Comparisons with other RGB images
• Exercises

Typical colours

Fig. 6 shows the typical colours of the HRV Fog RGB images. The colours of the semitransparent clouds depend on many factors, for example on their thickness and on the colour of the underlying surface.

Figure 6: Typical colours of the HRV Fog RGB (Source: Jochen Kerkmann, MSG Interpretation Guide, EUMETSAT)

There is a good colour contrast between snow and land and between snow and water clouds. Unfortunately snow and thick ice clouds have similar colours. However, the movement and the structure may help to discriminate them.