The Viennese tree cadastre “Baumkataster” contains all trees growing on city property. Amongst the attributes you can find the tree species and year of plantation as well as the diameter of it’s crown.
Using the crown diameter, we can create a foliage map of the city of Vienna. (Note that trees on private ground are missing.)
Here’s a high-resolution version of the map: PDF (10 MB)
The tree cadastre is still under construction. If you miss a tree, let the OGD team know.