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This website works with the data from Bielefeld’s official tree registry. That is where all trees in public spaces are listed. It does not contain forests but single trees - the ones that might turn a boring and grey street into a greener area.
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+ The following map shows which districts have the most public trees. It reveals that the districts of Schildesche and Mitte (centre) have the most trees per square kilometre. That might be related to the big recreational area around the lake “Obersee”.
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Which district has the most trees per square kilometre?
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+ How green a city is can be seen not only from the number of trees, but from the sum of all the vegetation.
+ One way of analysing this is the normalized difference vegetation index (NDVI).
+ Using satellite imaging data, it measures the difference between near-infrared (which vegetation strongly reflects) and red light (which vegetation absorbs). The result contains information about the condition of the vegetation in a city.
+ The following graph visualizes the development of the average NDVI values of the are of Bielefeld from 2013 to 2023.
+ It clearly shows the differences between summer and winter.
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Development of the vegetation in Bielefeld from 2013 to 2023 (NDVI)
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Trees in Bielefeld
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Bielefeld is known to be a pretty green city. We love our parks, the forest and the city trees.
+ But how much do you know about the trees in your neighbourhood? Use this map to explore Bielefeld’s trees.
+ Find out how tall they are, how wide their crowns are and what species they are.
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