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30 June, 2013 - 22:05 By News Desk

Open University branches out with tree map

Jonathan Silvertown, Professor of Ecology at The Open University

Treezilla, a monster map of trees, has been launched by The Open University and partners. The citizen science project aims to map every tree in Britain through and related apps.

Treezilla is a database representing Britain’s tree legacy and future and enables scientific investigations into tree diseases, their contribution to the ecosystem, and how climate change affects tree growth and health. Treezilla is free and open to everyone to use and local groups are encouraged to upload data about the trees in their area.

Large inventories of tree data already held by local authorities and institutions can also be uploaded to create a powerful new database. There are tens of thousands of trees from such sources already in Treezilla.

Jonathan Silvertown, Professor of Ecology at The Open University, said: “We know there are 3.8 billion trees in forests and woodlands and another 123 million elsewhere in the countryside but no overall estimate exists of the number of urban trees, or trees on private estates. Treezilla will help us to get a more accurate picture of this important resource.”

Treezilla also calculates and displays an evaluation of the monetary value of the ecosystem services that trees provide. These include capturing carbon dioxide (CO2), reducing flood risk, reducing energy use by buildings and improving air quality in cities. These values differ according to location, size, and species, and a richly populated database would therefore present a much more accurate picture of total benefits from trees.

David Foster, chief executive of The Parks Trust, said: “As custodian of many hundreds of thousands of trees in Milton Keynes, I would like to encourage people to connect with those trees and understand and appreciate them. Treezilla is a wonderful initiative to give power to the people and help achieve that.”

Treezilla is part of the OpenScience Laboratory, an initiative of The Open University and The Wolfson Foundation, developed in partnership with Forest Research and Treeconomics. Treezilla can be accessed on at or Twitter @Treezilla_org

• PHOTOGRAPH SHOWS: Jonathan Silvertown

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