Definition of discretized fog states. More...

Detailed Description

Definition of discretized fog states.

Definition of discretized fog states according to [2]. The bandwidth of thick and dense fog was adjusted to fit the German StVO regarding rear fog lights [3]. (V = Visibility in meters [m])

Visibility is defined as the length of the atmosphere over which a beam of light travels before its luminous flux is reduced to 5% of its original value (definition used by the Meteorological Office [4]). This is approximately equivalent to visibility measured in terms of the contrast of a distant object against its background.

Requirements

Number	Type name	Requirements
0	FOG_UNKOWN	Visibility is unknown (must not be used in ground truth).
1	FOG_OTHER	Other (unspecified but known) fog intensity.
2	FOG_EXCELLENT_VISIBILITY	Excellent visibility, when V in [40000,infinity[ [m]
3	FOG_GOOD_VISIBILITY	Good visibility, when V in [10000,40000[ [m]
4	FOG_MODERATE_VISIBILITY	Moderate visibility, when V in [4000,10000[ [m]
5	FOG_POOR_VISIBILITY	Poor visibility, when V in [2000,4000[ [m]
6	FOG_MIST	Mist, when V in [1000,2000[ [m]
7	FOG_LIGHT	Fog, when V in [200,1000[ [m]
8	FOG_THICK	Thick fog, when V in [50,200[ [m]

References:

[2] SHEPARD, Frank D. Reduced visibility due to fog on the highway. Transportation Research Board, 1996.
[3] StVO 17 chapter 3
[4] Homepage of the Meteorological Office