Help us create a map of Britain's trees with this Treezilla app. The system also calculates the environmental benefits ('ecosystem services') provided by trees, for example how much pollution they remove from the air.

Move the dot onto an aerial photo of the area and that's it the tree is mapped.

You can then measure the tree size and identify it, this information is used to automatically calculate the ecosystem services.

The system also allows you to add lots more information about the tree such as pests and diseases, tree condition, pavement damage etc.

All the information is searchable.

If the information has already been added then you can see the identity and other information about trees in your local area.

Get together with friends to turn your town into an arboretum!