osi3::EnvironmentalConditions Struct Reference

Definition of discretized precipitation states according to [1].

(I = Intensity of precipitation in mm per hour mm/h)

Reference:

[1] Paulat, M., Frei, C., Hagen, M. & Wernli, H. (2008). A gridded dataset of hourly precipitation in Germany: Its construction, climatology and application. Meteorologische Zeitschrift. Vol. 17, No. 6. pp. 719-732. Berlin, Stuttgart, Germany. https://doi.org/10.1127/0941-2948/2008/0332

Definition of discretized fog states according to [1].

The bandwidth of thick and dense fog was adjusted to fit the German StVO regarding rear fog lights [2, 3]. (V = Visibility in 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.

References:

[1] Shepard, F. D. (1996). Reduced visibility due to fog on the highway. Transportation Research Board, National Research Council (Ed.). National Academy Press. Washington, D.C., USA. ISBN 0-309-06006-0.
[2] Strassenverkehrs-Ordnung (StVO) as of dated March 06, 2013 (BGBl. I S. 367), lastly changed by article 4a of the order from June 06, 2019 (BGBl. I S. 756).
[3] stvo.de. (2013, April 01). StVO Par. 17 Beleuchtung. Retrieved January 25, 2020, from https://www.stvo.de/strassenverkehrsordnung/101-17-beleuchtung
[4] Meteorological Office UK. (2020). Homepage of the Meteorological Office - How we measure visibility. Retrieved January 25, 2020, from http://www.metoffice.gov.uk/guide/weather/observations-guide/how-we-measure-visibility

Definition of discretized ambient illumination states: Ambient light is any light in the vehicle's environment that is not emitted by the vehicle itself.

It can include sun/moon light, light from other cars, street lights etc.

lx ("lux") is the SI unit of luminance or illumination of an area of exact one square meter, which is equal to one lumen per square meter 1 lx = 1 lm/m^2 [1]. lm ("lumen") is the SI derived unit of luminous flux and a measure of the total quantity of visible light emitted by a source. The lumen is defined in relation to cd ("candela") as 1 lm = 1 cd sr, where sr denotes steradian, the unit of solid angle used in 3D geometry analogous to the radian [1].

Categorization is done based on natural day/night time illuminance levels [2] and standards for required lighting levels on roads [2, 3, 4, 5].

References:

[1] DIN Deutsches Institut fuer Normung e. V. (1982). DIN 5031-3 Strahlungsphysik im optischen Bereich und Lichttechnik - Groessen, Formelzeichen und Einheiten der Lichttechnik. (DIN 5031-3:1982-03). Berlin, Germany.
[2] National Optical Astronomy Observatory. (2015, December 02). Recommended Light Levels. Retrieved January 25, 2020, from https://www.noao.edu/education/QLTkit/ACTIVITY_Documents/Safety/LightLevels_outdoor+indoor.pdf
[3] Wang, Y. & Zou, Y., (2016, March). Study on Illumination for State Highways. Washington State Department of Transportation. Retrieved January 25, 2020, from http://www.wsdot.wa.gov/research/reports/fullreports/847.1.pdf
[4] Laperriere, A. (2011, May). LED street lighting in the municipality of Saint-Gedeon-de-Beauce within the framework of advanced lighting technologies. Retrieved January 25, 2020, from http://sslnet.ca/wp-content/uploads/2011/10/LTE-RT-2011-0076-Anglais.pdf
[5] Crabb, G. I., Beaumont, R. & Webster, D. (2008, October 17). Review of the class and quality of street lighting. Transport Research Laboratory. Retrieved January 25, 2020, from http://courtneystrong.com/wp-content/uploads/2017/07/css-sl1-class-and-quality-of-street-lighting.pdf

The ambient illumination of the environment.

The time of day at the host vehicles location.

The unix timestamp describes the time and date at the host vehicle's location, referring to UTC.

The Unix epoch (or Unix time or POSIX time or Unix timestamp) is the number of seconds that have elapsed since January 1, 1970 (midnight UTC/GMT [1]), not counting leap seconds [2]. Historically, the origin of UNIX system time was referred to as "00:00:00 GMT, January 1, 1970" [2]. Literally speaking the epoch is Unix time 0 (midnight 1/1/1970), but 'epoch' is often used as a synonym for 'Unix time'. Many Unix systems store epoch dates as a signed 32-bit integer, which might cause problems on January 19, 2038 (known as the Year 2038 problem or Y2038).

Note

You can convert the timestamp using the following routines sorted by languages.

References:

[1] ITU Radiocommunication Assembly. (2002). Recommendation ITU-R TF.460-6 Standard-frequency and time-signal emissions. (Rec. ITU-R TF.460-6). Retrieved January 25, 2020, from http://www.itu.int/dms_pubrec/itu-r/rec/tf/R-REC-TF.460-6-200202-I!!PDF-E.pdf
[2] The Open Group. (2018). POSIX.1-2017 The Open Group Base Specifications Issue 7, 2018 edition. IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008). Retrieved January 25, 2020, from https://pubs.opengroup.org/onlinepubs/9699919799/xrat/contents.html

Atmospheric pressure in Pascal at z=0.0 in world frame (about 101325 Pa).

Unit: Pa

Rules

is_greater_than_or_equal_to: 80000

is_less_than_or_equal_to: 120000

Temperature in Kelvin at z=0.0 in world frame.

Unit: K

Rules

is_greater_than_or_equal_to: 170

is_less_than_or_equal_to: 340

Relative humidity in at z=0.0 in world frame.

Note that physically more relevant measures, like absolute or specific humidity can be easily derived from relative_humidity, given that the temperature and atmospheric_pressure are known.

Unit: %

Rules

is_greater_than_or_equal_to: 0

is_less_than_or_equal_to: 100

Description of the precipitation.

Description of the fog.

Optional external reference to the environmental condition sources.

Note

For OpenDRIVE and OpenSCENARIO there is no direct counterpart.

For non-ASAM standards, it is implementation-specific how source_reference is resolved.

The value has to be repeated because one object may be derived from more than one origin source, for example, from a scenario file and from sensors.

Description of the clouds.

Description of the wind.

Description of the sun.