Local Authority Maintained Trees

This dataset includes the locations and species information for over 880,000 of London's trees. It also includes additional information such as size and age for some of these trees. These are predominantly street trees, but also some trees in parks and other open spaces.

The data does not represent the entirety of the capital's urban forest - the London iTree report estimated that there are over eight million trees in London, which includes trees in woodlands, parks, streets, private gardens and more. The data includes 26 of London's 33 boroughs, the City of London and Transport for London.

As recognised in the [London Urban Forest Plan](https://www.london.gov.uk/sites/default/files/londonurbanforestplan_final.pdf), collating data about London's urban forest is challenging due to the number of landowners and managers involved, as well as the limited resources available. The Plan committed to undertaking regular updates to this map, and also, over time, to collating a London-wide inventory of publicly owned and managed trees, in line with emerging national standards.

The data is used on the [London Street Tree Map](https://apps.london.gov.uk/street-trees/).

Notes on the data:

* The data on the map includes data provided in 2014-15, during initial data collection, and updated data provided in 2019-20. Where boroughs did not provide updated data in 2019-20, the 2014-15 data has been retained. However, trees may have been surveyed some time before this and so some records may be several years old.
* The map includes data from 26 of the London boroughs, the City of London and Transport for London (TfL). TfL trees are shown London-wide.
* Data has not been received to date from six boroughs. We aim to add any additional data received to the  [**Datastore**](http://data.london.gov.uk/dataset/local-authority-maintained-trees)  and online map.
* Some large gaps on the map are due to large green spaces (including the Royal Parks), reservoirs, or airports, as well as those boroughs where data is missing.
* The data received varies 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.
* Tree species data has been 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 24 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.
* 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.

**Warning: Large file size may result in a long download time**

本数据集收录了超过88万棵伦敦树木的地理位置和物种信息。此外，还包括部分树木的尺寸和年龄等附加信息。这些树木主要以街道树木为主，亦包括公园和其他开放空间中的树木。该数据集并不代表伦敦都市森林的全部——根据伦敦iTree报告，伦敦的树木总数超过八百万棵，涵盖林地、公园、街道、私人花园等多个领域。数据涵盖了伦敦33个区中的26个，伦敦市以及伦敦交通局。正如[伦敦都市森林计划](https://www.london.gov.uk/sites/default/files/londonurbanforestplan_final.pdf)中所认识到的那样，由于涉及众多土地所有者和管理者，以及有限的资源，对伦敦都市森林数据的收集是一项极具挑战性的工作。该计划承诺将定期更新此地图，并在未来逐步收集伦敦全市公有和管理的树木清单，以符合国家标准的最新发展。数据被应用于[伦敦街道树木地图](https://apps.london.gov.uk/street-trees/)。

数据说明：
* 地图上的数据包括2014-15年首次数据收集期间提供的数据，以及2019-20年提供的更新数据。对于在2019-20年未提供更新数据的区，保留了2014-15年的数据。然而，部分树木的普查可能在此之前的几年内进行，因此部分记录可能已超过数年。
* 地图包括26个伦敦区的数据，伦敦市以及伦敦交通局（TfL）的数据。TfL的树木数据在伦敦范围内展示。
* 截至目前，尚未收到六个区的数据。我们旨在将收到的任何额外数据添加到[**数据存储库**](http://data.london.gov.uk/dataset/local-authority-maintained-trees)和在线地图中。
* 地图上存在一些较大的空白区域，这些区域由大型绿地（包括皇家公园）、水库或机场等造成，以及数据缺失的区。
* 收到的数据在各区之间存在显著差异。一些区仅包括公路上的树木，而其他区则包括住宅用地、学校或公园中的树木。在某些情况下，只有在进行工作时才会记录树木。
* 伦敦没有统一的或达成共识的格式来收集或记录树木数据。这在跨多个区收集数据时构成了挑战。许多区收集有关其树木的各种信息（例如年龄、高度）。然而，由于收集的信息和使用的分类在各区之间存在差异，因此我们无法对这些信息进行标准化。
* 为了帮助绘制地图，已向数据中添加了“树木ID”编号。此编号未与区的树木管理系统相连接。

**警告：文件体积较大，可能导致下载时间较长**