Current meteorological data
Air temperature: 49.64 (°F)
9.8 (°C)
Wind speed:4 (km/h)
Wind direction: N-O, 46.8 °
Global radiation: 144.9 (W/m²)
Act. UV-Index: 0.2
Precipitation: 0.0 (ltr/m²)
(Updated: 11/27/2020, 15:00,
S-Mitte, Amt für Umweltschutz
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7. The calculation basis of the solar radiation maps

The calculations are based on Stuttgart's climate data. What is required are monthly measurements of global radiation and diffuse radiation as well as the average monthly amount of sunshine hours per hour interval.

The irradiation was calculated in consideration of the orientation, inclination and shadowing of the horizontal in Wh/m² per month for the Gauss-Krüger coordinates ranging between 3503000 - 3523000 and 5395000 - 5414500 in grid spaces of 50 m.

All topographic elements within the rectangle confined by the Gauss-Krüger coordinates 3502000 - 3524000 and 5394000 - 5415000 determined by the digital surface model were used for calculating the shadowing effects. Shadow sources situated outside this rectangle were not taken into account.

The calculation of direct solar radiation was carried out on the 15th of each month in intervals of 10 minutes.

The shadowing effects of diffuse radiation were determined with a resolution of one angular degree for the azimuth angle and the elevation angle. The assumed hemisphere emittance (H) depending on the elevation angle (w) is H(w)=2/3sin(w)+1/3.

The calculation was made by the office for solar urban planning Dr.-Ing. Peter Goretzki.


© City of Stuttgart, Office for Environmental Protection, Section of Urban Climatology