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Cartes pollution lumineuse d’ ALLEMAGNE Version 3
This map try to show us the sky quality useable by a training observer.
Precautions of interpretation : This map is good only for a zenithal cone of 50° (from the vertical of a precise location) and don’t show the light pollution toward the horizon.
To consider the value indicate on the map, it’s understood that the observer may have not to be expose himself to a direct light source and he have to be sheltered from a direct light source.
The precision of the data are not guarantee : this is indicated values and obtain with arithmetic and non-based from reality. Locals phenomenas as lighting of monuments or public buildings, or at the contrary the extinction of the light from a certain time can elude the data.
This map show the light pollution at the time of 23:00, during winter, with a midle quantity of humidity around 85 percent.
The highway, due to the cars light are systematicaly counted as a source of light pollution. Moreover, the glowing due the cars crossing can reduce to nothing around 20 minutes the nocturn vision of the observer and the quality of the local seeing. Aquatic places don’t have to be take in consideration : the light propagation of the light glare was voluntary reduce in a clearness concern.
This map show the urban places : artisanal places, industrial places, residential places and some big building (nuclear central i.e). The elevation play a dominant role on the light propagation : more the observer is high, less the light diffusion is important. In this way, a city located below an observation point at 1000m higher will affect less the air quality for the observer contrary to if this last was been in plain (at the same level of the light source).
The efect of the elevation are semi-logarithmic : the first thousand of meters have an important role on the air quality.