Non-desert, snow free land usually appears reddish brown (terra-cotta) in the HRV Fog RGB images. The brightness of the colour strongly depends on the (solar and satellite) viewing angles; see the images below.
Explanation of the colours of non deserted, snow free land (see also the recipe on the left side):
• The reflectivity is less then medium in the NIR1.6 channel. After the linear stretching it is around medium.
• The reflectivity value is considerably less than medium in the HRV channel.
• Both the NIR1.6 and the HRV reflectivity values depend on the surface type, and considerably depend on the viewing angles. For lower solar elevations the reflectivity values are lower.
As a consequence the red signal is higher than the (equal) green and blue signals resulting reddish brown colour; brighter at midday and darker at low solar elevation.