Local Authority Maintained Trees
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<p>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.</p> <p>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.</p> <p>As recognised in the <a href="https://www.london.gov.uk/sites/default/files/londonurbanforestplan_final.pdf" target="_blank" style="color: black;">London Urban Forest Plan</a>, 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.</p> <p>The data is used on the <a href="https://apps.london.gov.uk/street-trees/" target="_blank" style="color: black;">London Street Tree Map</a>.</p> <div class="embed-container" style="position: relative; padding-bottom: 750px; height: auto; overflow: hidden; max-width: 100%;"><iframe style="border: 0; position: absolute; top: 0; left: 0; width: 100%; height: 100%;" src="https://apps.london.gov.uk/street-trees"></iframe></div> <p>Notes on the data:</p> <ul> <li>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.</li> <li>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.</li> <li>Data has not been received to date from six boroughs. We aim to add any additional data received to the <a href="http://data.london.gov.uk/dataset/local-authority-maintained-trees" target="_blank" style="color: rgb(158, 0, 89);"> <strong>Datastore</strong> </a> and online map.</li> <li>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.</li> <li>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.</li> <li>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.</li> <li>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.</li> <li>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.</li> </ul> <p> <br> </p> <p> </p> <p> <strong>Warning: Large file size may result in a long download time</strong> </p>
<p>本数据集涵盖伦敦超88万棵树木的位置与物种信息，其中部分树木还附带了树径、树龄等附加数据。本次收录的树木以行道树为主，同时包含部分公园及其他开放空间中的树木。</p><p>本数据集并未覆盖伦敦都市森林的全部范围——据《伦敦iTree报告》估算，伦敦全市树木总量超800万棵，涵盖林地、公园、街道、私人花园等各类区域中的树木。本次数据集覆盖了伦敦33个行政区中的26个，以及伦敦市（City of London）与伦敦交通局（Transport for London, TfL）。</p><p>正如《伦敦都市森林规划》（London Urban Forest Plan）中所指出的，由于涉及众多土地所有者与管理者，且可用资源有限，整理伦敦都市森林相关数据极具挑战。该规划承诺定期更新本数据集地图，并将逐步按照新兴的国家标准，编制一份覆盖全伦敦的公有管护树木清单。</p><p>本数据集已应用于<a href="https://apps.london.gov.uk/street-trees/" target="_blank" style="color: black;">《伦敦行道树地图》（London Street Tree Map）</a>。</p><div class="embed-container" style="position: relative; padding-bottom: 750px; height: auto; overflow: hidden; max-width: 100%;"><iframe style="border: 0; position: absolute; top: 0; left: 0; width: 100%; height: 100%;" src="https://apps.london.gov.uk/street-trees"></iframe></div><p>数据说明：</p><ul><li>本地图数据包含2014-2015年初始数据采集阶段提供的数据，以及2019-2020年的更新数据。若行政区未在2019-2020年提交更新数据，则保留2014-2015年的原始数据。但部分树木的勘测时间可能早于上述时段，因此部分记录的年份可能较早。</li><li>本地图数据覆盖26个伦敦行政区、伦敦市以及伦敦交通局（Transport for London, TfL）的树木信息，其中TfL管护的树木将在全伦敦范围内展示。</li><li>目前尚未收到6个行政区的树木数据。我方计划将后续收到的新增数据更新至<a href="http://data.london.gov.uk/dataset/local-authority-maintained-trees" target="_blank" style="color: rgb(158, 0, 89);"><strong>数据存储库（Datastore）</strong></a>与在线地图中。</li><li>地图上出现的大面积空白区域，主要源于大型绿地（包括皇家公园）、水库或机场，以及未提交数据的行政区。</li><li>各行政区提交的数据存在显著差异：部分行政区仅收录了道路旁的树木，另有部分行政区收录了住宅用地、学校或公园内的树木；部分区域仅在开展管护作业时才会记录树木信息。</li><li>伦敦全市尚未形成统一的树木数据采集与记录标准，这为跨行政区的数据整合工作带来了极大挑战。许多行政区会采集树木的多项信息（如树龄、树高），但各行政区的采集内容与分类方式均存在差异，因此我方无法对这类信息进行标准化处理。</li><li>为便于在树木网页地图上展示，我方已将树种数据标准化为简化通用名（例如“梨树”）。本次选取了数据中出现频次最高的24类树木（覆盖总量90%的树木）的通用名，剩余树木均归类为“其他”。同时，我方保留了各行政区在原始数据中提供的树种学名。</li><li>我方已为数据新增“树木ID”编号，以辅助地图绘制。该编号与各行政区的树木管理系统并无关联。</li></ul><p><br></p><p> </p><p><strong>警告：文件体积较大，下载可能耗时较长。</strong></p>
