We publish maps with urban greenery (trees and sometimes shrubs), map parks and streets ourselves and draw on open governement data.
Information comes from Wikipedia, images from Wikimedia Commons, maps from OpenStreetMap. More and more municipalities are publishing their tree files as open data.

We feel involved in nature, especially in the city. We are happy to share our knowledge with everyone, just like the aforementioned projects, and in the public interest, just like the government. Education comes first.

open data = freely available and reusable data

Berbice estate in Voorschoten

August 2021: project has started.

Tree map of the whole of Leiden?

A tree map of the whole of Leiden, our 'City of Knowledge', would be nice. The map exists, with 75,000 trees. No permission from the municipality to publish it yet.

Whether Leiden will follow where Amsterdam, Rotterdam, The Hague, Utrecht, Eindhoven, Tilburg, Groningen, Nijmegen, Dordrecht, Delft, Arnhem, Assen, Amersfoort, Lelystad and more cities went earlier is still an open question .


(to be added)