Luxembourg does not use enough roofs for solar power

With “Roofpedia»Researchers at the National University of Singapore have developed software that looks at the roof of their houses and apartments for the citizens of Luxembourg City. The program evaluates satellite images and automatically recognizes which roofs are suitable for solar systems or greenery. “As the population in metropolitan areas continues to grow, cities need effective measures to improve their environment for both residents and the surrounding ecology. The roof landscape has been proven to have the potential to do so, ”according to the authors of the study.

The software offers researchers a comprehensive register of more than a million roofs in 16 cities around the world. In addition to the capital of the Grand Duchy, these are Berlin, Copenhagen, Las Vegas, Los Angeles, Melbourne, New York City, Paris, Phoenix, Portland, San Diego, San Francisco, San Jose, Seattle, Vancouver and Zurich. With the help of this data, the scientists created an index that relates the number of roof areas used to the number of unused ones. “So we can understand the current and actual condition of the roofscape. So far, most studies have been based on estimates, ”the researchers added.

“Solid basis for follow-up studies”

Zurich is at the top of the overall ranking. The city in Switzerland achieved 100 points in the greening index. “Since 1991, all newly constructed buildings there have had to be equipped with green roofs,” say the researchers. In the solar index, Zurich ranks second with 81 points behind Las Vegas (86 points). In both cities, a particularly large number of roof areas are used for solar systems.

In the overall ranking (see table below), Zurich performs best, ahead of Berlin and Las Vegas. Paris ranks eighth. Luxembourg City ranks 14th there with six points. This value is made up of the seven points for the solar index and the four points for the greening index. “We assume that the interest in roofs in urban analysis will continue to grow, so that our work and the data obtained can form a solid basis for follow-up studies,” the authors say.

(Grafiken: National University of Singapore)

(sw / The essential)

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