London Tree Map

This map is an initial attempt to visually present London tree data. The majority of the data is for street trees but also includes some park trees. The map shows the locations and species information for over 700,000 trees. The recent London iTree report estimated that there are over eight million trees in London, so the map is only a partial illustration of trees in London

There are several potential benefits to the public sharing of tree data. We hope that visualising tree data, and providing access to it in one place, will help to raise the public profile of the important contribution of trees to our urban environment and also provide operational benefits for tree managers. Sharing and standardising data could provide essential information for the strategic management of the urban forest. For example, it could help to assess species diversity and threats from pests and plant diseases across London, and also help identify areas for additional planting.

The data was provided in 2014-15. There is more explanation of the data below the map, and the data is available on the London Datastore.


About the tree data

  • The map includes data from 25 of the London boroughs, the City of London and Transport for London (TfL).  TfL trees are shown London-wide.
  • Data was not received from six boroughs. One other borough did not record location data in a form that was possible to easily map and so those trees could not be included. We aim to add any additional data received to the Datastore and online map.
  • Some large gaps on the map are due to large green spaces (including the Royal Parks), reservoirs, or airports.
  • Whilst the data was provided in 2014-15, the trees will have been surveyed some time before this and so some records may be several years old.
  • The data received varied significantly by borough. Some boroughs have only included trees on highways, whilst others have included trees on housing land, in schools or in parks. In some cases trees were recorded only when work was carried out.
  • There is not a consistent or agreed format for collecting or recording tree data across London. This presents a challenge in collating data across multiple boroughs. Many boroughs collect a range of information about their trees (e.g. age, height). However this varied by borough in terms of the information collected and categorisations used so we were not able to standardise this information.
  • We requested tree species information as common names. Five boroughs only had Latin names recorded. The common names given also varied widely in terms of consistency of names, spelling, etc. As such, we went through the data and standardised the names to come up with a simplified common name for display on the tree webmap (e. g. “Pear”). These are the common names for the 22 types of tree appearing most frequently in the data (which encompass 90% of all trees), with the remaining trees categorised as “Other”. We have also left the species name as provided by the borough in the data.  In total over 2,000 different species of tree were recorded, grouped into over 100 types of tree using the common names.
  • The ‘tree ID’ number has been added to the data to help map it. This number is not linked to borough’s tree management systems. Although for future data updates it would be helpful to establish such a link.

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