Introduction of a additive description for old and new weather conditions

[m-pauly]

Signed-off-by: Markus Waldmann markus.waldmann@stud.hs-kempten.de & Markus Pauly markus.pauly@stud.hs-kempten.de

Description

Introduction of the use of continuous values instead of enums for several weather-values for example:

• Clouds: OSC & OSI provide 5 states. However, the cloud cover is officially divided into eighth values between 0 and 1: like in the Glossar of the German weather department DWD (dwd.de - https://www.dwd.de/DE/service/lexikon/Functions/glossar.html?lv2=100932&lv3=101016). This values should be adapted to each other.
• Ambient Illumination: Describes the Illumination in the environment in LUX, consists of 11 values. Should be described by continuous double values
• Precipitation: Contains 9 possible values Continuous values, should be described by double values - instead of categories according to the context of ISO 2315
• Fog Density: 10 enum values describe the visibility/density in "m" (meter), should be described by double values

[thempen]

@kmeids Before bringing the PR to ReadyToMerge, we would need some feedback from the SensorModeling group.

[kmeids]

@thempen I only see an open Issue, is there a PR?

FYI:
In the SM group we already had several discussions on this topic and alignments with OSC as well.
We went through several suggestions and initially agreed on one that @jruebsam is trying to draft the first message structure.
We need to align during our next SM or Harmonization meeting (depending on your and @jruebsam's availability).

[adrianschultz]

Within the new OpenSCENARIO project this is for discussion:

Definition of cloud states using the fractional cloud cover in oktas.

    International commision on illumination (CIE):
    "Quotient of the sum of the solid angles subtended by clouds and the solid angle 2π sr of the whole sky.
    Note 1 to entry: Observation of total cloud amount is usually recorded in tenths or oktas, where one okta indicates an extent of cloud cover equal to one eighth of the sky.
    Note 2 to entry: The total cloud amount has unit one.     Note 3 to entry: This entry was numbered 845-09-92 in IEC 60050-845:1987.
    Note 4 to entry: This entry was numbered 17-1321 in CIE S 017:2011."


    Oktas   German description      English description                 mapping to deprecated enum
    ---------------------------------------------------------------------------
    0/8     wolkenlos               Cloudless, clear sky, no clouds     free
    1/8     sonnig                  Sunny, few clouds
    2/8     heiter                  Serene, few clouds
    3/8     leicht bewölkt          Light cloudy, scattered
    4/8     wolkig                  Cloudy, scattered                   cloudy
    5/8     bewölkt                 Cloudy, broken
    6/8     stark bewölkt           Heavily clouded, broken             rainy
    7/8     fast bedeckt            Almost overcast, broken
    8/8     bedeckt                 Overcast, sky completely cloudy     overcast
    9/8     Himmel nicht erkennbar  Sky not visible, obscured           skyOff