NATIONAL FOREST INVENTORY WOODLAND ENGLAND 2017

The NFI woodland map covers all forest and woodland area over 0.5 hectare with a minimum of 20% canopy cover (or the potential to achieve it) and a minimum width of 20 metres, including areas of new planting, clearfell, windblow and restocked areas.

The woodland map excludes all 'tarmac' roads, rivers and powerlines where the gap in the woodland is greater than 20 meters wide.

The woodland map is continually updated on an annual basis. The changes in the canopy cover have been identified on remote sensing imagery taken during spring/summer 2016 or colour aerial orthophotographic imagery available at the time of the assessment. Additionally, new planting information from grant schemes and the FE sub-compartment database for the financial year 2017/2018 have been added to the woodland map.

The changes in the woodland boundaries use the Ordnance Survey MasterMap® (OSMM) as a reference where appropriated. OSMM is the most up to date large-scale digital map of GB providing a seamless database for 1:1250, 1:2500 and 1:10000 survey data.

All woodland (both urban and rural, regardless of ownership) which is 0.5 hectare or greater in extent, with the exception of Assumed woodland or Low density areas that can be 0.1 hectare or greater in extend. Woodland less than 0.5 hectare in extent will not be described within the dataset but will be included in a separate sample survey of small woodland and tree features.

Any maps produced using this data should contain the following Forestry Commission

acknowledgement: "Contains, or is based on, information supplied by the Forestry Commission. © Crown copyright and database right 2018 Ordnance Survey [100021242]". Attribution statement: Any maps produced using this data should contain the following Forestry Commission acknowledgement: “Contains, or is based on, information supplied by the Forestry Commission. © Crown copyright and database right 2022 Ordnance Survey [100021242]”

国家森林与林地图覆盖了所有面积超过0.5公顷的森林和林地区域，其树冠覆盖率至少为20%（或具有达到此标准的能力），且最小宽度为20米，包括新种植区域、皆伐区域、风倒区域和更新区域。该图排除了所有树冠间隙宽度超过20米的沥青道路、河流和输电线路。林地图每年都会进行持续更新，其中树冠覆盖率的变更是通过2016年春夏季的遥感影像或评估时可供使用的彩色航空正射影像进行识别的。此外，2017/2018财政年度的资助计划以及FE次级小区数据库中的新种植信息也被添加到了林地图中。林地边界的变更在适当的情况下以军械测绘大师图®（OSMM）为参考。OSMM是英国最新的大规模数字地图，提供1:1250、1:2500和1:10000比例尺的连续数据库。所有面积达到0.5公顷或以上的林地（无论城市或农村，无论所有权如何），除非是假想林地或密度较低的区域，其面积可以达0.1公顷或以上。面积小于0.5公顷的林地不会在数据集中进行描述，但将包含在针对小型林地和树木特征的单独样本调查中。使用此数据生成的任何地图都应包含以下林业委员会的认可信息：‘包含或基于林业委员会提供的信息。©英国皇家版权和数据库权利2018年军械测绘[100021242]’。归因声明：使用此数据生成的任何地图都应包含以下林业委员会的认可信息：‘包含或基于林业委员会提供的信息。©英国皇家版权和数据库权利2022年军械测绘[100021242]’。